UIButton category for centering title label and image vertically. The text label is placed below the image.

UIButton+VerticalLayout.h

@interface UIButton (VerticalLayout)  

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

@end  

UIButton+VerticalLayout.m

#import "UIButton+VerticalLayout.h"

@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);
   
}


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


@end

as indicated here (where I assume this came from) the calculation of the titleSize doesn't work properly for custom fonts / sizes.

This works and is updated for ios7+

CGSize titleSize = [self.titleLabel.text sizeWithAttributes: @{NSFontAttributeName:self.titleLabel.font}];

If you change the font of the titleLabel this won't work. The image does not center properly for some reason