Multiline UIButton + Auto Layout

gistfile1.m

- (CGSize)intrinsicContentSize {
    
    CGSize boundingSize = CGSizeMake(self.titleLabel.preferredMaxLayoutWidth - self.titleEdgeInsets.left - self.titleEdgeInsets.right, CGFLOAT_MAX);
    
    NSAttributedString *attributedTitle = [self attributedTitleForState:self.state];
    
    CGRect boundingRect;
    
    if(attributedTitle) {
        
        boundingRect = [attributedTitle boundingRectWithSize:boundingSize options:(NSStringDrawingUsesLineFragmentOrigin | NSStringDrawingUsesFontLeading) context:NULL];
    }
    else {
        
        NSString *title = [self titleForState:self.state];
        
        boundingRect = [title boundingRectWithSize:boundingSize options:(NSStringDrawingUsesLineFragmentOrigin | NSStringDrawingUsesFontLeading) attributes:@{NSFontAttributeName : self.titleLabel.font} context:NULL];
    }
    
    
    return CGSizeMake(boundingRect.size.width + self.titleEdgeInsets.left + self.titleEdgeInsets.right, boundingRect.size.height + self.titleEdgeInsets.top + self.titleEdgeInsets.bottom);
}

This works for me.

class MultiLineButton: UIButton {

    // MARK: - Init

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

        self.commonInit()
    }

    private func commonInit() {
        self.titleLabel?.numberOfLines = 0
        self.titleLabel?.lineBreakMode = .byWordWrapping
    }

    // MARK: - Overrides

    override var intrinsicContentSize: CGSize {
        titleLabel?.intrinsicContentSize ?? .zero
    }

    override func layoutSubviews() {
        super.layoutSubviews()
        titleLabel?.preferredMaxLayoutWidth = titleLabel?.frame.size.width ?? 0
        super.layoutSubviews()
    }

}