Makes UIButtons tap-friendly by making the hitbox a minimum of 44x44pt.

US2TapFriendlyButton.h

//
//  US2TapFriendlyButton.h
//
//  Created by Alexander Johansson on 14/01/2014.
//
//

#import <UIKit/UIKit.h>

@interface US2TapFriendlyButton : UIButton


- (BOOL)pointInside:(CGPoint)point withEvent:(UIEvent *)event;


@end

US2TapFriendlyButton.m

//
//  US2TapFriendlyButton.m
//
//  Created by Alexander Johansson on 14/01/2014.
//
//

#import "US2TapFriendlyButton.h"

#define kMinHitBoxHeight 44
#define kMinHitBoxWidth 44

@implementation US2TapFriendlyButton


- (BOOL)pointInside:(CGPoint)point withEvent:(UIEvent *)event
{
    if ([super pointInside:point withEvent:event])
    {
        return true;
    }

    CGFloat insetWidth = 0;
    CGFloat insetHeight = 0;

    CGFloat deltaWidth = self.bounds.size.width - kMinHitBoxWidth;
    CGFloat deltaHeight = self.bounds.size.height - kMinHitBoxHeight;

    if (deltaWidth < 0)
    {
        insetWidth = deltaWidth / 2;
    }
    if (deltaHeight < 0)
    {
        insetHeight = deltaHeight / 2;
    }
    

    UIEdgeInsets hitTestEdgeInsets = UIEdgeInsetsMake(insetHeight, insetWidth, insetHeight, insetWidth);
    CGRect hitFrame = UIEdgeInsetsInsetRect(self.bounds, hitTestEdgeInsets);

    return CGRectContainsPoint(hitFrame, point);
}

@end