Etiqueta debajo de la imagen en UIButton

Estoy tratando de crear un botón que tenga algo de texto debajo del icono (algo así como los botones de la aplicación), sin embargo, parece ser bastante difícil de lograr. ¿Alguna idea de cómo puedo conseguir que el texto se muestre debajo de la imagen con un UIButton?

O simplemente puede usar esta categoría:

ObjC

@interface UIButton (VerticalLayout)

- (void)centerVerticallyWithPadding:(float)padding;
- (void)centerVertically;

@end

@implementation UIButton (VerticalLayout)

- (void)centerVerticallyWithPadding:(float)padding {
    CGSize imageSize = self.imageView.frame.size;
    CGSize titleSize = self.titleLabel.frame.size;
    CGFloat totalHeight = (imageSize.height + titleSize.height + padding);
    
    self.imageEdgeInsets = UIEdgeInsetsMake(- (totalHeight - imageSize.height),
                                            0.0f,
                                            0.0f,
                                            - titleSize.width);
    
    self.titleEdgeInsets = UIEdgeInsetsMake(0.0f,
                                            - imageSize.width,
                                            - (totalHeight - titleSize.height),
                                            0.0f);
    
    self.contentEdgeInsets = UIEdgeInsetsMake(0.0f,
                                              0.0f,
                                              titleSize.height,
                                              0.0f);
}

- (void)centerVertically {
    const CGFloat kDefaultPadding = 6.0f;
    [self centerVerticallyWithPadding:kDefaultPadding];
}

@end

Extensión rápida

extension UIButton {
    
    func centerVertically(padding: CGFloat = 6.0) {
        guard
            let imageViewSize = self.imageView?.frame.size,
            let titleLabelSize = self.titleLabel?.frame.size else {
            return
        }
        
        let totalHeight = imageViewSize.height + titleLabelSize.height + padding
        
        self.imageEdgeInsets = UIEdgeInsets(
            top: -(totalHeight - imageViewSize.height),
            left: 0.0,
            bottom: 0.0,
            right: -titleLabelSize.width
        )
        
        self.titleEdgeInsets = UIEdgeInsets(
            top: 0.0,
            left: -imageViewSize.width,
            bottom: -(totalHeight - titleLabelSize.height),
            right: 0.0
        )
        
        self.contentEdgeInsets = UIEdgeInsets(
            top: 0.0,
            left: 0.0,
            bottom: titleLabelSize.height,
            right: 0.0
        )
    }
    
}

Sugerencia: Si la altura del botón es menor que totalHeight, entonces la imagen dibujará bordes exteriores.

imageEdgeInset.top debiera ser:

max(0, -(totalHeight - imageViewSize.height))

En Xcode, simplemente puede establecer el recuadro izquierdo del título del borde en negativo al ancho de la imagen. Esto mostrará la etiqueta en el centro de la imagen.

Para que la etiqueta se muestre debajo de la imagen (algo así como los botones de la aplicación), es posible que deba configurar el recuadro superior del título del borde en algún número positivo.

Este es un botón de título centrado simple implementado en Swift anulando titleRect(forContentRect:)y imageRect(forContentRect:). También se implementa intrinsicContentSizepara usar con AutoLayout.

import UIKit

class CenteredButton: UIButton
{
    override func titleRect(forContentRect contentRect: CGRect) -> CGRect {
        let rect = super.titleRect(forContentRect: contentRect)

        return CGRect(x: 0, y: contentRect.height - rect.height + 5,
            width: contentRect.width, height: rect.height)
    }

    override func imageRect(forContentRect contentRect: CGRect) -> CGRect {
        let rect = super.imageRect(forContentRect: contentRect)
        let titleRect = self.titleRect(forContentRect: contentRect)

        return CGRect(x: contentRect.width/2.0 - rect.width/2.0,
            y: (contentRect.height - titleRect.height)/2.0 - rect.height/2.0,
            width: rect.width, height: rect.height)
    }

    override var intrinsicContentSize: CGSize {
        let size = super.intrinsicContentSize

        if let image = imageView?.image {
            var labelHeight: CGFloat = 0.0

            if let size = titleLabel?.sizeThatFits(CGSize(width: self.contentRect(forBounds: self.bounds).width, height: CGFloat.greatestFiniteMagnitude)) {
                labelHeight = size.height
            }

            return CGSize(width: size.width, height: image.size.height + labelHeight + 5)
        }

        return size
    }

    override init(frame: CGRect) {
        super.init(frame: frame)
        centerTitleLabel()
    }

    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
        centerTitleLabel()
    }

    private func centerTitleLabel() {
        self.titleLabel?.textAlignment = .center
    }
}

Mira esta gran respuesta en Swift.

extension UIButton {

    func alignImageAndTitleVertically(padding: CGFloat = 6.0) {
        let imageSize = self.imageView!.frame.size
        let titleSize = self.titleLabel!.frame.size
        let totalHeight = imageSize.height + titleSize.height + padding

        self.imageEdgeInsets = UIEdgeInsets(
            top: -(totalHeight - imageSize.height),
            left: 0,
            bottom: 0,
            right: -titleSize.width
        )

        self.titleEdgeInsets = UIEdgeInsets(
            top: 0,
            left: -imageSize.width,
            bottom: -(totalHeight - titleSize.height),
            right: 0
        )
    }

}

Subclase UIButton. Anular: layoutSubviewspara mover el incorporado subviewsa nuevas posiciones:

- (void)layoutSubviews
{
    [super layoutSubviews];

    CGRect frame = self.imageView.frame;
    frame = CGRectMake(truncf((self.bounds.size.width - frame.size.width) / 2), 0.0f, frame.size.width, frame.size.height);
    self.imageView.frame = frame;

    frame = self.titleLabel.frame;
    frame = CGRectMake(truncf((self.bounds.size.width - frame.size.width) / 2), self.bounds.size.height - frame.size.height, frame.size.width, frame.size.height);
    self.titleLabel.frame = frame;
}

Respuesta de icecrystal23 refactorizada.

Swift 3, funciona con autolayouts, xib, storyboards, puede ser animado.

El botón en la respuesta original de icecrystal23 tenía un marco mal calculado. Creo que lo arreglé.

Editar: actualizado a Swift 5 e hizo el trabajo dentro de Interface Builder / Storyboards

import UIKit

@IBDesignable
class VerticalButton: UIButton {

    @IBInspectable public var padding: CGFloat = 20.0 {
        didSet {
            setNeedsLayout()
        }
    }

    override var intrinsicContentSize: CGSize {
        let maxSize = CGSize(width: CGFloat.greatestFiniteMagnitude, height: CGFloat.greatestFiniteMagnitude)

        if let titleSize = titleLabel?.sizeThatFits(maxSize), let imageSize = imageView?.sizeThatFits(maxSize) {
            let width = ceil(max(imageSize.width, titleSize.width))
            let height = ceil(imageSize.height + titleSize.height + padding)

            return CGSize(width: width, height: height)
        }

        return super.intrinsicContentSize
    }

    override func layoutSubviews() {
        if let image = imageView?.image, let title = titleLabel?.attributedText {
            let imageSize = image.size
            let titleSize = title.size()

            titleEdgeInsets = UIEdgeInsets(top: 0.0, left: -imageSize.width, bottom: -(imageSize.height + padding), right: 0.0)
            imageEdgeInsets = UIEdgeInsets(top: -(titleSize.height + padding), left: 0.0, bottom: 0.0, right: -titleSize.width)
        }

        super.layoutSubviews()
    }

}

corrigió una de las respuestas aquí:

Swift 3:

class CenteredButton: UIButton
{
    override func titleRect(forContentRect contentRect: CGRect) -> CGRect {
        let rect = super.titleRect(forContentRect: contentRect)
        let imageRect = super.imageRect(forContentRect: contentRect)

        return CGRect(x: 0, y: imageRect.maxY + 10,
                      width: contentRect.width, height: rect.height)
    }

    override func imageRect(forContentRect contentRect: CGRect) -> CGRect {
        let rect = super.imageRect(forContentRect: contentRect)
        let titleRect = self.titleRect(forContentRect: contentRect)

        return CGRect(x: contentRect.width/2.0 - rect.width/2.0,
                      y: (contentRect.height - titleRect.height)/2.0 - rect.height/2.0,
                      width: rect.width, height: rect.height)
    }

    override init(frame: CGRect) {
        super.init(frame: frame)
        centerTitleLabel()
    }

    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
        centerTitleLabel()
    }

    private func centerTitleLabel() {
        self.titleLabel?.textAlignment = .center
    }
}

Esta es una versión modificada de la excelente respuesta de Erik W. Pero en lugar de colocar la imagen centrada en la parte SUPERIOR de la vista, coloca la imagen y la etiqueta centradas en la vista como un grupo.

La diferencia es:

+-----------+
|    ( )    |
|   Hello   |     // Erik W's code
|           |
|           |
+-----------+

vs

+-----------+
|           |
|    ( )    |     // My modified version
|   Hello   |
|           |
+-----------+

Fuente a continuación:

-(void)layoutSubviews {
    [super layoutSubviews];

    CGRect titleLabelFrame = self.titleLabel.frame;
    CGSize labelSize = [self.titleLabel.text sizeWithFont:self.titleLabel.font constrainedToSize:CGSizeMake(self.frame.size.width, CGFLOAT_MAX) lineBreakMode:NSLineBreakByWordWrapping];

    CGRect imageFrame = self.imageView.frame;

    CGSize fitBoxSize = (CGSize){.height = labelSize.height + kTextTopPadding +  imageFrame.size.height, .width = MAX(imageFrame.size.width, labelSize.width)};

    CGRect fitBoxRect = CGRectInset(self.bounds, (self.bounds.size.width - fitBoxSize.width)/2, (self.bounds.size.height - fitBoxSize.height)/2);

    imageFrame.origin.y = fitBoxRect.origin.y;
    imageFrame.origin.x = CGRectGetMidX(fitBoxRect) - (imageFrame.size.width/2);
    self.imageView.frame = imageFrame;

    // Adjust the label size to fit the text, and move it below the image

    titleLabelFrame.size.width = labelSize.width;
    titleLabelFrame.size.height = labelSize.height;
    titleLabelFrame.origin.x = (self.frame.size.width / 2) - (labelSize.width / 2);
    titleLabelFrame.origin.y = fitBoxRect.origin.y + imageFrame.size.height + kTextTopPadding;
    self.titleLabel.frame = titleLabelFrame;
}

FYI: Esto puede romperse cuando se combina con animaciones UIView, ya que se llama a layoutSubviews durante ellas.

La solución de Dave en Swift:

override func layoutSubviews() {
    super.layoutSubviews()
    if let imageView = self.imageView {
        imageView.frame.origin.x = (self.bounds.size.width - imageView.frame.size.width) / 2.0
        imageView.frame.origin.y = 0.0
    }
    if let titleLabel = self.titleLabel {
        titleLabel.frame.origin.x = (self.bounds.size.width - titleLabel.frame.size.width) / 2.0
        titleLabel.frame.origin.y = self.bounds.size.height - titleLabel.frame.size.height
    }
}

Si subclasifica UIButtony override layoutSubviews, puede usar el siguiente para centrar la imagen y colocar el título centrado debajo:

kTextTopPadding es una constante que deberás introducir que determina el espacio entre la imagen y el texto debajo de ella.

-(void)layoutSubviews {
    [super layoutSubviews];

    // Move the image to the top and center it horizontally
    CGRect imageFrame = self.imageView.frame;
    imageFrame.origin.y = 0;
    imageFrame.origin.x = (self.frame.size.width / 2) - (imageFrame.size.width / 2);
    self.imageView.frame = imageFrame;

    // Adjust the label size to fit the text, and move it below the image
    CGRect titleLabelFrame = self.titleLabel.frame;
    CGSize labelSize = [self.titleLabel.text sizeWithFont:self.titleLabel.font
                                        constrainedToSize:CGSizeMake(self.frame.size.width, CGFLOAT_MAX)
                                        lineBreakMode:NSLineBreakByWordWrapping];
    titleLabelFrame.size.width = labelSize.width;
    titleLabelFrame.size.height = labelSize.height;
    titleLabelFrame.origin.x = (self.frame.size.width / 2) - (labelSize.width / 2);
    titleLabelFrame.origin.y = self.imageView.frame.origin.y + self.imageView.frame.size.height + kTextTopPadding;
    self.titleLabel.frame = titleLabelFrame;

}

Se actualizó la respuesta de Kenny Winker ya que sizeWithFont fue desaprobado en iOS 7.

-(void)layoutSubviews {
[super layoutSubviews];

int kTextTopPadding = 3;

CGRect titleLabelFrame = self.titleLabel.frame;

CGRect labelSize = [self.titleLabel.text boundingRectWithSize:CGSizeMake(CGFLOAT_MAX, CGRectGetHeight(self.bounds)) options:NSStringDrawingUsesLineFragmentOrigin attributes:@{NSFontAttributeName:self.titleLabel.font} context:nil];

CGRect imageFrame = self.imageView.frame;

CGSize fitBoxSize = (CGSize){.height = labelSize.size.height + kTextTopPadding +  imageFrame.size.height, .width = MAX(imageFrame.size.width, labelSize.size.width)};

CGRect fitBoxRect = CGRectInset(self.bounds, (self.bounds.size.width - fitBoxSize.width)/2, (self.bounds.size.height - fitBoxSize.height)/2);

imageFrame.origin.y = fitBoxRect.origin.y;
imageFrame.origin.x = CGRectGetMidX(fitBoxRect) - (imageFrame.size.width/2);
self.imageView.frame = imageFrame;

// Adjust the label size to fit the text, and move it below the image

titleLabelFrame.size.width = labelSize.size.width;
titleLabelFrame.size.height = labelSize.size.height;
titleLabelFrame.origin.x = (self.frame.size.width / 2) - (labelSize.size.width / 2);
titleLabelFrame.origin.y = fitBoxRect.origin.y + imageFrame.size.height + kTextTopPadding;
self.titleLabel.frame = titleLabelFrame;
}

En iOS 11 / Swift 4, ninguna de las respuestas anteriores realmente funcionó para mí. Encontré algunos ejemplos y le di la vuelta:

extension UIButton {

    func centerImageAndButton(_ gap: CGFloat, imageOnTop: Bool) {

      guard let imageView = self.currentImage,
      let titleLabel = self.titleLabel?.text else { return }

      let sign: CGFloat = imageOnTop ? 1 : -1
      self.titleEdgeInsets = UIEdgeInsetsMake((imageView.size.height + gap) * sign, -imageView.size.width, 0, 0);

      let titleSize = titleLabel.size(withAttributes:[NSAttributedStringKey.font: self.titleLabel!.font!])
      self.imageEdgeInsets = UIEdgeInsetsMake(-(titleSize.height + gap) * sign, 0, 0, -titleSize.width)
    }
}

Espero que esto ayude a alguien.

Usando el código de Kenny Winker y simeon, hago este código rápido que funciona para mí.

import UIKit

@IBDesignable
class TopIconButton: UIButton {
    override func layoutSubviews() {
        super.layoutSubviews()

        let kTextTopPadding:CGFloat = 3.0;

        var titleLabelFrame = self.titleLabel!.frame;


        let labelSize = titleLabel!.sizeThatFits(CGSizeMake(CGRectGetWidth(self.contentRectForBounds(self.bounds)), CGFloat.max))

        var imageFrame = self.imageView!.frame;

        let fitBoxSize = CGSizeMake(max(imageFrame.size.width, labelSize.width), labelSize.height + kTextTopPadding + imageFrame.size.    height)

        let fitBoxRect = CGRectInset(self.bounds, (self.bounds.size.width - fitBoxSize.width)/2, (self.bounds.size.height - fitBoxSize.    height)/2);

        imageFrame.origin.y = fitBoxRect.origin.y;
        imageFrame.origin.x = CGRectGetMidX(fitBoxRect) - (imageFrame.size.width/2);
        self.imageView!.frame = imageFrame;

        // Adjust the label size to fit the text, and move it below the image

        titleLabelFrame.size.width = labelSize.width;
        titleLabelFrame.size.height = labelSize.height;
        titleLabelFrame.origin.x = (self.frame.size.width / 2) - (labelSize.width / 2);
        titleLabelFrame.origin.y = fitBoxRect.origin.y + imageFrame.size.height + kTextTopPadding;
        self.titleLabel!.frame = titleLabelFrame;
        self.titleLabel!.textAlignment = .Center
    }

}

Solo tiene que ajustar las tres inserciones de borde según el tamaño de la imagen y la etiqueta del título:

button.contentEdgeInsets = UIEdgeInsetsMake(0, 0, titleLabelBounds.height + 4, 0)
button.titleEdgeInsets = UIEdgeInsetsMake(image.size.height + 8, -image.size.width, 0, 0)
button.imageEdgeInsets = UIEdgeInsetsMake(0, 0, 0, -titleLabelBounds.width)

Puede obtener los límites de la etiqueta del título llamando a sizeToFit después de configurar su texto. El espaciado horizontal debería funcionar independientemente del tamaño del texto, la fuente y la imagen, pero no conozco una solución única para que el espaciado vertical y el borde del contenido inferior sean consistentes.

Aquí está la respuesta de "Bear With Me" como una subclase en Swift 2.0. Para usarlo, simplemente cambie la clase de su botón Interface Buildera VerticalButtony actualizará mágicamente la vista previa.

También lo actualicé para calcular el tamaño de contenido intrínseco correcto para la distribución automática.

import UIKit

@IBDesignable

class VerticalButton: UIButton {
    @IBInspectable var padding: CGFloat = 8

    override func prepareForInterfaceBuilder() {
        super.prepareForInterfaceBuilder()

        update()
    }

    override func layoutSubviews() {
        super.layoutSubviews()

        update()
    }

    func update() {
        let imageBounds = self.imageView!.bounds
        let titleBounds = self.titleLabel!.bounds
        let totalHeight = CGRectGetHeight(imageBounds) + padding + CGRectGetHeight(titleBounds)

        self.imageEdgeInsets = UIEdgeInsets(
            top: -(totalHeight - CGRectGetHeight(imageBounds)),
            left: 0,
            bottom: 0,
            right: -CGRectGetWidth(titleBounds)
        )

        self.titleEdgeInsets = UIEdgeInsets(
            top: 0,
            left: -CGRectGetWidth(imageBounds),
            bottom: -(totalHeight - CGRectGetHeight(titleBounds)),
            right: 0
        )
    }

    override func intrinsicContentSize() -> CGSize {
        let imageBounds = self.imageView!.bounds
        let titleBounds = self.titleLabel!.bounds

        let width = CGRectGetWidth(imageBounds) > CGRectGetWidth(titleBounds) ? CGRectGetWidth(imageBounds) : CGRectGetWidth(titleBounds)
        let height = CGRectGetHeight(imageBounds) + padding + CGRectGetHeight(titleBounds)

        return CGSizeMake(width, height)
    }
}

@Tiago cambio tu respuesta así. Funciona bien con todos los tamaños.

func alignImageAndTitleVertically(padding: CGFloat = 5.0) {
        self.sizeToFit()
        let imageSize = self.imageView!.frame.size
        let titleSize = self.titleLabel!.frame.size
        let totalHeight = imageSize.height + titleSize.height + padding

        self.imageEdgeInsets = UIEdgeInsets(
            top: -(totalHeight - imageSize.height),
            left: 0,
            bottom: 0,
            right: -titleSize.width
        )

        self.titleEdgeInsets = UIEdgeInsets(
            top: 0,
            left: 0,
            bottom: -(totalHeight - titleSize.height),
            right: titleSize.height
        )
    }

Tomé una combinación de las respuestas aquí y se me ocurrió una que parece estar funcionando para mí, en Swift. No me encanta cómo acabo de anular las inserciones, pero funciona. Estaría abierto a las mejoras sugeridas en los comentarios. Parece funcionar correctamente con sizeToFit()y con diseño automático.

import UIKit

/// A button that displays an image centered above the title.  This implementation 
/// only works when both an image and title are set, and ignores
/// any changes you make to edge insets.
class CenteredButton: UIButton
{
    let padding: CGFloat = 0.0

    override func layoutSubviews() {
        if imageView?.image != nil && titleLabel?.text != nil {
            let imageSize: CGSize = imageView!.image!.size
            titleEdgeInsets = UIEdgeInsetsMake(0.0, -imageSize.width, -(imageSize.height + padding), 0.0)
            let labelString = NSString(string: titleLabel!.text!)
            let titleSize = labelString.sizeWithAttributes([NSFontAttributeName: titleLabel!.font])
            imageEdgeInsets = UIEdgeInsetsMake(-(titleSize.height + padding), 0.0, 0.0, -titleSize.width)
            let edgeOffset = abs(titleSize.height - imageSize.height) / 2.0;
            contentEdgeInsets = UIEdgeInsetsMake(edgeOffset, 0.0, edgeOffset, 0.0)
        }
        super.layoutSubviews()
    }

    override func sizeThatFits(size: CGSize) -> CGSize {
        let defaultSize = super.sizeThatFits(size)
        if let titleSize = titleLabel?.sizeThatFits(size),
        let imageSize = imageView?.sizeThatFits(size) {
            return CGSize(width: ceil(max(imageSize.width, titleSize.width)), height: ceil(imageSize.height + titleSize.height + padding))
        }
        return defaultSize
    }

    override func intrinsicContentSize() -> CGSize {
        let size = sizeThatFits(CGSize(width: CGFloat.max, height: CGFloat.max))
        return size
    }
}

Use estos dos métodos:

func titleRect(forContentRect contentRect: CGRect) -> CGRect
func imageRect(forContentRect contentRect: CGRect) -> CGRect

Ejemplo:

class VerticalButton: UIButton {

  override func titleRect(forContentRect contentRect: CGRect) -> CGRect {
    let titleRect = super.titleRect(forContentRect: contentRect)
    let imageRect = super.imageRect(forContentRect: contentRect)

    return CGRect(x: 0,
                  y: contentRect.height - (contentRect.height - padding - imageRect.size.height - titleRect.size.height) / 2 - titleRect.size.height,
                  width: contentRect.width,
                  height: titleRect.height)
  }

  override func imageRect(forContentRect contentRect: CGRect) -> CGRect {
    let imageRect = super.imageRect(forContentRect: contentRect)
    let titleRect = self.titleRect(forContentRect: contentRect)

    return CGRect(x: contentRect.width/2.0 - imageRect.width/2.0,
                  y: (contentRect.height - padding - imageRect.size.height - titleRect.size.height) / 2,
                  width: imageRect.width,
                  height: imageRect.height)
  }

  private let padding: CGFloat
  init(padding: CGFloat) {
    self.padding = padding

    super.init(frame: .zero)
    self.titleLabel?.textAlignment = .center
  }

  required init?(coder aDecoder: NSCoder) { fatalError() }
}

extension UIButton {

  static func vertical(padding: CGFloat) -> UIButton {
    return VerticalButton(padding: padding)
  }
}

Y puedes usar:

let myButton = UIButton.vertical(padding: 6)

Swift 5 : el siguiente método me funciona

func centerVerticallyWithPadding(padding : CGFloat) {
        guard
            let imageViewSize = self.imageView?.frame.size,
            let titleLabelSize = self.titleLabel?.frame.size else {
            return
        }

        let totalHeight = imageViewSize.height + titleLabelSize.height + padding

        self.imageEdgeInsets = UIEdgeInsets(
            top: max(0, -(totalHeight - imageViewSize.height)),
            left: 0.0,
            bottom: 0.0,
            right: -titleLabelSize.width
        )

        self.titleEdgeInsets = UIEdgeInsets(
            top: (totalHeight - imageViewSize.height),
            left: -imageViewSize.width,
            bottom: -(totalHeight - titleLabelSize.height),
            right: 0.0
        )

        self.contentEdgeInsets = UIEdgeInsets(
            top: 0.0,
            left: 0.0,
            bottom: titleLabelSize.height,
            right: 0.0
        )
    }

Asegúrese de que el título de su botón no esté truncado en storyboard / xib; de lo contrario, busque la
Solución 2

class SVVerticalButton: UIButton {

    override func layoutSubviews() {
        super.layoutSubviews()
        let padding : CGFloat = 2.0
        if let imageView = self.imageView {
            imageView.frame.origin.x = (self.bounds.size.width - imageView.frame.size.width) / 2.0
            imageView.frame.origin.y = max(0,(self.bounds.size.height - (imageView.frame.size.height + (titleLabel?.frame.size.height ?? 0.0) + padding)) / 2.0)
        }
        if let titleLabel = self.titleLabel {
            titleLabel.frame.origin.x = 0
            titleLabel.frame.origin.y = self.bounds.size.height - titleLabel.frame.size.height
            titleLabel.frame.size.width = self.bounds.size.width
            titleLabel.textAlignment = .center
        }
    }

}

Creo que una de las mejores formas de hacerlo es subclasificar UIButton y anular algunos métodos de representación:

- (void)awakeFromNib
{
    [super awakeFromNib];
    [self setupSubViews];
}

- (instancetype)init
{
    if (self = [super init])
    {
        [self setupSubViews];
    }
    return self;
}

- (void)setupSubViews
{
    [self.imageView setTranslatesAutoresizingMaskIntoConstraints:NO];
    [self addConstraint:[NSLayoutConstraint constraintWithItem:self attribute:NSLayoutAttributeCenterX relatedBy:NSLayoutRelationEqual toItem:self.imageView attribute:NSLayoutAttributeCenterX multiplier:1 constant:0]];
    [self.titleLabel setTranslatesAutoresizingMaskIntoConstraints:NO];
    [self addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|[imageView][titleLabel]|" options:NSLayoutFormatAlignAllCenterX metrics:nil views:@{@"imageView": self.imageView, @"titleLabel": self.titleLabel}]];
}

- (CGSize)intrinsicContentSize
{
    CGSize imageSize = self.imageView.image.size;
    CGSize titleSize = [self.titleLabel.text sizeWithAttributes:@{NSFontAttributeName: self.titleLabel.font}];
    return CGSizeMake(MAX(imageSize.width, titleSize.width), imageSize.height + titleSize.height);
}

Descubrí que la respuesta de Simeón era probablemente la mejor, pero me estaba dando resultados extraños en algunos botones y simplemente no podía entender por qué. Entonces, usando su respuesta como base, implementé mis botones como a continuación:

#define PADDING 2.0f

@implementation OOButtonVerticalImageText

-(CGSize) intrinsicContentSize {
  CGSize size = [super intrinsicContentSize];
  CGFloat labelHeight = 0.0f;
  CGSize titleSize = [self.titleLabel sizeThatFits:CGSizeMake([self contentRectForBounds:self.bounds].size.width, CGFLOAT_MAX)];
  labelHeight = titleSize.height;
  return CGSizeMake(MAX(titleSize.width, self.imageView.image.size.width), self.imageView.image.size.height + labelHeight + PADDING);
}

-(void) layoutSubviews {
  [super layoutSubviews];

  CGSize titleSize = [self.titleLabel sizeThatFits:CGSizeMake([self contentRectForBounds:self.bounds].size.width, CGFLOAT_MAX)];
  self.titleLabel.frame = CGRectMake((self.bounds.size.width - titleSize.width)/2.0f,
                                     self.bounds.size.height - titleSize.height - PADDING,
                                     titleSize.width,
                                     titleSize.height);

  CGSize ivSize = self.imageView.frame.size;
  self.imageView.frame = CGRectMake((self.bounds.size.width - ivSize.width)/2.0f,
                                    self.titleLabel.frame.origin.y - ivSize.height - PADDING,
                                    ivSize.width,
                                    ivSize.height);
}

@end

Aquí está mi subclase de la UIButtoncual resuelve este problema:

@implementation MyVerticalButton

@synthesize titleAtBottom; // BOOL property

- (id)initWithFrame:(CGRect)frame
{
  self = [super initWithFrame:frame];
  if (self) {
    self.titleAtBottom = YES;
  }
  return self;
}

- (CGSize)sizeThatFits:(CGSize)size {
  self.titleLabel.text = [self titleForState: self.state];

  UIEdgeInsets imageInsets = self.imageEdgeInsets;
  UIEdgeInsets titleInsets = self.titleEdgeInsets;

  CGSize imageSize = [self imageForState: self.state].size;
  if (!CGSizeEqualToSize(imageSize, CGSizeZero)) {
    imageSize.width += imageInsets.left + imageInsets.right;
    imageSize.height += imageInsets.top + imageInsets.bottom;

  }

  CGSize textSize = [self.titleLabel sizeThatFits: CGSizeMake(size.width - titleInsets.left - titleInsets.right,
                                                              size.height -(imageSize.width +
                                                                            titleInsets.top+titleInsets.bottom))];
  if (!CGSizeEqualToSize(textSize, CGSizeZero)) {
    textSize.width += titleInsets.left + titleInsets.right;
    textSize.height += titleInsets.top + titleInsets.bottom;
  }

  CGSize result = CGSizeMake(MAX(textSize.width, imageSize.width),
                             textSize.height + imageSize.height);
  return result;
}

- (void)layoutSubviews {
  // needed to update all properities of child views:
  [super layoutSubviews];

  CGRect bounds = self.bounds;

  CGRect titleFrame = UIEdgeInsetsInsetRect(bounds, self.titleEdgeInsets);
  CGRect imageFrame = UIEdgeInsetsInsetRect(bounds, self.imageEdgeInsets);
  if (self.titleAtBottom) {
    CGFloat titleHeight = [self.titleLabel sizeThatFits: titleFrame.size].height;
    titleFrame.origin.y = CGRectGetMaxY(titleFrame)-titleHeight;
    titleFrame.size.height = titleHeight;
    titleFrame = CGRectStandardize(titleFrame);
    self.titleLabel.frame = titleFrame;

    CGFloat imageBottom = CGRectGetMinY(titleFrame)-(self.titleEdgeInsets.top+self.imageEdgeInsets.bottom);
    imageFrame.size.height = imageBottom - CGRectGetMinY(imageFrame);
    self.imageView.frame = CGRectStandardize(imageFrame);
  } else {
    CGFloat titleHeight = [self.titleLabel sizeThatFits: titleFrame.size].height;
    titleFrame.size.height = titleHeight;
    titleFrame = CGRectStandardize(titleFrame);
    self.titleLabel.frame = titleFrame;

    CGFloat imageTop = CGRectGetMaxY(titleFrame)+(self.titleEdgeInsets.bottom+self.imageEdgeInsets.top);
    imageFrame.size.height = CGRectGetMaxY(imageFrame) - imageTop;
    self.imageView.frame = CGRectStandardize(imageFrame);
  }
}

- (void)setTitleAtBottom:(BOOL)newTitleAtBottom {
  if (titleAtBottom!=newTitleAtBottom) {
    titleAtBottom=newTitleAtBottom;
    [self setNeedsLayout];
  }
}

@end

Eso es. Funciona como encanto. El problema puede aparecer si el botón será demasiado pequeño para ajustarse al título y al texto.

La solución de @ simeon en Objective-C

#import "CenteredButton.h"

@implementation CenteredButton

- (CGRect)titleRectForContentRect:(CGRect)contentRect
{
    CGRect rect = [super titleRectForContentRect: contentRect];
    return CGRectMake(0,
                      contentRect.size.height - rect.size.height - 5,
                      contentRect.size.width,
                      rect.size.height);
}

- (CGRect)imageRectForContentRect:(CGRect)contentRect
{
    CGRect rect = [super imageRectForContentRect: contentRect];
    CGRect titleRect = [self titleRectForContentRect: contentRect];

    return CGRectMake(contentRect.size.width / 2.0 - rect.size.width / 2.0,
                      (contentRect.size.height - titleRect.size.height)/2.0 - rect.size.height/2.0,
                      rect.size.width,
                      rect.size.height);
}

- (CGSize)intrinsicContentSize {
    CGSize imageSize = [super intrinsicContentSize];

    if (self.imageView.image) {
        UIImage* image = self.imageView.image;
        CGFloat labelHeight = 0.0;

        CGSize labelSize = [self.titleLabel sizeThatFits: CGSizeMake([self contentRectForBounds: self.bounds].size.width, CGFLOAT_MAX)];
        if (CGSizeEqualToSize(imageSize, labelSize)) {
            labelHeight = imageSize.height;
        }

        return CGSizeMake(MAX(labelSize.width, imageSize.width), image.size.height + labelHeight + 5);
    }

    return imageSize;
}

- (id) initWithFrame:(CGRect)frame {
    self = [super initWithFrame:frame];
     if (self) {
         [self centerTitleLabel];
     }
    return self;

}

- (id)initWithCoder:(NSCoder *)aDecoder {
    self = [super initWithCoder:aDecoder];
    if (self) {
        [self centerTitleLabel];
    }
    return self;
}

- (void)centerTitleLabel {
    self.titleLabel.textAlignment = NSTextAlignmentCenter;
}

@end

Si está utilizando fuentes personalizadas, el cálculo del tamaño titleLabel no funcionará correctamente, debe reemplazarlo por

let titleLabelSize = self.titleLabel?.text?.size(withAttributes: [NSAttributedStringKey.font: self.titleLabel!.font!])

En lugar de pasar por el infierno tratando de colocar el icono y el texto con inserciones de borde, puede crear una cadena NSAttributedString con su imagen como archivo adjunto y establecerla en el título atribuido de su botón:

let titleText = NSAttributedString(string: yourTitle, attributes: attributes)
let imageAttachment = NSTextAttachment()
imageAttachment.image = yourImage

let title = NSMutableAttributedString(string: "")
title.append(NSAttributedString(attachment: imageAttachment))
title.append(titleText)

button.setAttributedTitle(title, for: .normal)

Solución amigable de localización:

Muchas soluciones geniales, pero me gustaría agregar una nota aquí para aquellos que usan la localización.

Debe invertir los valores de EdgeInstets izquierdo y derecho para que el botón se distribuya correctamente en caso de que cambie la dirección del idioma de LtR a RtL.

Usando una solución similar, la implementaría de la siguiente manera:

extension UIButton {

    func alignVertical(spacing: CGFloat, lang: String) {
        guard let imageSize = self.imageView?.image?.size,
            let text = self.titleLabel?.text,
            let font = self.titleLabel?.font
        else { return }

        let labelString = NSString(string: text)
        let titleSize = labelString.size(
            withAttributes: [NSAttributedString.Key.font: font]
        )

        var titleLeftInset: CGFloat = -imageSize.width
        var titleRigtInset: CGFloat = 0.0

        var imageLeftInset: CGFloat = 0.0
        var imageRightInset: CGFloat = -titleSize.width

        if Locale.current.languageCode! != "en" { // If not Left to Right language
            titleLeftInset = 0.0
            titleRigtInset = -imageSize.width

            imageLeftInset = -titleSize.width
            imageRightInset = 0.0
        }

        self.titleEdgeInsets = UIEdgeInsets(
            top: 0.0,
            left: titleLeftInset,
            bottom: -(imageSize.height + spacing),
            right: titleRigtInset
        )
        self.imageEdgeInsets = UIEdgeInsets(
            top: -(titleSize.height + spacing),
            left: imageLeftInset,
            bottom: 0.0,
            right: imageRightInset
        )
        let edgeOffset = abs(titleSize.height - imageSize.height) / 2.0;
        self.contentEdgeInsets = UIEdgeInsets(
            top: edgeOffset,
            left: 0.0,
            bottom: edgeOffset,
            right: 0.0
        )
    }
}

Imagen superior y botón de título inferior con subclase UIButton

class VerticalButton: UIButton {
  override func layoutSubviews() {
    super.layoutSubviews()
    let padding: CGFloat = 8
    let iH = imageView?.frame.height ?? 0
    let tH = titleLabel?.frame.height ?? 0
    let v: CGFloat = (frame.height - iH - tH - padding) / 2
    if let iv = imageView {
      let x = (frame.width - iv.frame.width) / 2
      iv.frame.origin.y = v
      iv.frame.origin.x = x
    }

    if let tl = titleLabel {
      let x = (frame.width - tl.frame.width) / 2
      tl.frame.origin.y = frame.height - tl.frame.height - v
      tl.frame.origin.x = x
    }
  }
}

Eso definitivamente es una exageración para esta pregunta, sin embargo ... En uno de mis proyectos, primero tuve que implementar un botón con el icono alineado más a la izquierda. Luego tenemos otro botón con título debajo de la imagen. Busqué una solución existente pero sin suerte. Entonces, aquí va el botón alineable:

@IBDesignable
class AlignableButton: UIButton {

override class var requiresConstraintBasedLayout: Bool {
    return true
}

@objc enum IconAlignment: Int {
    case top, left, right, bottom
}

// MARK: - Designables
@IBInspectable var iconAlignmentValue: Int {
    set {
        iconAlignment = IconAlignment(rawValue: newValue) ?? .left
    }
    get {
        return iconAlignment.rawValue
    }
}

var iconAlignment: IconAlignment = .left

@IBInspectable var titleAlignmentValue: Int {
    set {
        titleAlignment = NSTextAlignment(rawValue: newValue) ?? .left
    }
    get {
        return titleAlignment.rawValue
    }
}

var titleAlignment: NSTextAlignment = .left

// MARK: - Corner Radius
@IBInspectable
var cornerRadius: CGFloat {
    get {
        return layer.cornerRadius
    }
    set {
        layer.masksToBounds = (newValue != 0)
        layer.cornerRadius = newValue
    }
}

// MARK: - Content size
override var intrinsicContentSize: CGSize {
    
    switch iconAlignment {
    case .top, .bottom:
        return verticalAlignedIntrinsicContentSize
    
    default:
        return super.intrinsicContentSize
    }
}

private var verticalAlignedIntrinsicContentSize: CGSize {
    
    if let imageSize = imageView?.intrinsicContentSize,
        let labelSize = titleLabel?.intrinsicContentSize {
        
        let width = max(imageSize.width, labelSize.width) + contentEdgeInsets.left + contentEdgeInsets.right
        let height = imageSize.height + labelSize.height + contentEdgeInsets.top + contentEdgeInsets.bottom
        
        return CGSize(
            width: ceil(width),
            height: ceil(height)
        )
    }
    
    return super.intrinsicContentSize
}

// MARK: - Image Rect
override func imageRect(forContentRect contentRect: CGRect) -> CGRect {
    
    switch iconAlignment {
    case .top:
        return topAlignedImageRect(forContentRect: contentRect)
    case .bottom:
        return bottomAlignedImageRect(forContentRect: contentRect)
    case .left:
        return leftAlignedImageRect(forContentRect: contentRect)
    case .right:
        return rightAlignedImageRect(forContentRect: contentRect)
    }
}

func topAlignedImageRect(forContentRect contentRect: CGRect) -> CGRect {
    let rect = super.imageRect(forContentRect: contentRect)
    
    let x = (contentRect.width - rect.width) / 2.0 + contentRect.minX
    let y = contentRect.minY
    let w = rect.width
    let h = rect.height
    
    return CGRect(
        x: x,
        y: y,
        width: w,
        height: h
    ).inset(by: imageEdgeInsets)
}

func bottomAlignedImageRect(forContentRect contentRect: CGRect) -> CGRect {
    let rect = super.imageRect(forContentRect: contentRect)
    
    let x = (contentRect.width - rect.width) / 2.0 + contentRect.minX
    let y = contentRect.height - rect.height + contentRect.minY
    let w = rect.width
    let h = rect.height
    
    return CGRect(
        x: x,
        y: y,
        width: w,
        height: h
    ).inset(by: imageEdgeInsets)
}

func leftAlignedImageRect(forContentRect contentRect: CGRect) -> CGRect {
    let rect = super.imageRect(forContentRect: contentRect)
    
    let x = contentRect.minX
    let y = (contentRect.height - rect.height) / 2 + contentRect.minY
    let w = rect.width
    let h = rect.height
    
    return CGRect(
        x: x,
        y: y,
        width: w,
        height: h
    ).inset(by: imageEdgeInsets)
}

func rightAlignedImageRect(forContentRect contentRect: CGRect) -> CGRect {
    let rect = super.imageRect(forContentRect: contentRect)
    
    let x = (contentRect.width - rect.width) + contentRect.minX
    let y = (contentRect.height - rect.height) / 2 + contentRect.minY
    let w = rect.width
    let h = rect.height
    
    return CGRect(
        x: x,
        y: y,
        width: w,
        height: h
    ).inset(by: imageEdgeInsets)
}

// MARK: - Title Rect
override func titleRect(forContentRect contentRect: CGRect) -> CGRect {
    
    switch iconAlignment {
    case .top:
        return topAlignedTitleRect(forContentRect: contentRect)
    case .bottom:
        return bottomAlignedTitleRect(forContentRect: contentRect)
    case .left:
        return leftAlignedTitleRect(forContentRect: contentRect)
    case .right:
        return rightAlignedTitleRect(forContentRect: contentRect)
    }
}

func topAlignedTitleRect(forContentRect contentRect: CGRect) -> CGRect {
    
    let rect = super.titleRect(forContentRect: contentRect)

    let x = contentRect.minX
    let y = contentRect.height - rect.height + contentRect.minY
    let w = contentRect.width
    let h = rect.height
    
    return CGRect(
        x: x,
        y: y,
        width: w,
        height: h
    ).inset(by: titleEdgeInsets)
}

func bottomAlignedTitleRect(forContentRect contentRect: CGRect) -> CGRect {
    
    let rect = super.titleRect(forContentRect: contentRect)
    
    let x = contentRect.minX
    let y = contentRect.minY
    let w = contentRect.width
    let h = rect.height
    
    return CGRect(
        x: x,
        y: y,
        width: w,
        height: h
    ).inset(by: titleEdgeInsets)
}

func leftAlignedTitleRect(forContentRect contentRect: CGRect) -> CGRect {
    
    let titleRect = super.titleRect(forContentRect: contentRect)
    let imageRect = self.imageRect(forContentRect: contentRect)
    
    let x = imageRect.width + imageRect.minX
    let y = (contentRect.height - titleRect.height) / 2.0 + contentRect.minY
    let w = contentRect.width - imageRect.width * 2.0
    let h = titleRect.height
    
    return CGRect(
        x: x,
        y: y,
        width: w,
        height: h
    ).inset(by: titleEdgeInsets)
}

func rightAlignedTitleRect(forContentRect contentRect: CGRect) -> CGRect {
    
    let titleRect = super.titleRect(forContentRect: contentRect)
    let imageRect = self.imageRect(forContentRect: contentRect)

    let x = contentRect.minX + imageRect.width
    let y = (contentRect.height - titleRect.height) / 2.0 + contentRect.minY
    let w = contentRect.width - imageRect.width * 2.0
    let h = titleRect.height
    
    return CGRect(
        x: x,
        y: y,
        width: w,
        height: h
    ).inset(by: titleEdgeInsets)
}

// MARK: - Lifecycle
override func awakeFromNib() {
    super.awakeFromNib()
    
    titleLabel?.textAlignment = titleAlignment
}

override func prepareForInterfaceBuilder() {
    super.prepareForInterfaceBuilder()
    
    titleLabel?.textAlignment = titleAlignment
}
}