A custom UIButton extension that can change title and image insets depending on button state.

CEButton.h

//
//  CEButton.h
//
//  Created by Cemal Eker on 11/12/13. (2013-11-12)
//  Modified by Oliver Dowling on 2014-04-28.
//

#import <UIKit/UIKit.h>

@interface CEButton : UIButton

- (void)setTitleEdgeInsets:(UIEdgeInsets)titleEdgeInsets forState:(UIControlState)state;
- (void)setImageEdgeInsets:(UIEdgeInsets)imageEdgeInsets forState:(UIControlState)state;

@end

CEButton.m

//
//  CEButton.m
//
//  Created by Cemal Eker on 11/12/13. (2013-11-12)
//  Modified by Oliver Dowling on 2014-04-28.
//

#import "CEButton.h"

@interface CEButton () {
@private
    NSMutableDictionary *_customTitleEdgeInsets;
    NSMutableDictionary *_customImageEdgeInsets;
}

- (void)updateInsets;

@end


@implementation CEButton

- (void)initCEButton
{
    if (nil != self) {
        _customTitleEdgeInsets = [[NSMutableDictionary alloc] init];
        _customImageEdgeInsets = [[NSMutableDictionary alloc] init];
        
        for (NSString *keyPath in @[@"selected", @"highlighted", @"enabled"]) {
            [self addObserver:self
                   forKeyPath:keyPath
                      options:(NSKeyValueObservingOptionNew
                               | NSKeyValueObservingOptionOld)
                      context:NULL];
        }
    }
}

- (id)init {
    self = [super init];

    if (nil != self) {
        [self initCEButton];
    }

    return self;
}

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

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

- (void)setTitleEdgeInsets:(UIEdgeInsets)titleEdgeInsets {
    [self setTitleEdgeInsets:titleEdgeInsets forState:UIControlStateNormal];
}

- (void)setImageEdgeInsets:(UIEdgeInsets)imageEdgeInsets {
    [self setImageEdgeInsets:imageEdgeInsets forState:UIControlStateNormal];
}

- (void)setTitleEdgeInsets:(UIEdgeInsets)titleEdgeInsets forState:(UIControlState)state {
    [_customTitleEdgeInsets
     setObject:[NSValue valueWithUIEdgeInsets:titleEdgeInsets]
     forKey:@(state)];
}

- (void)setImageEdgeInsets:(UIEdgeInsets)imageEdgeInsets forState:(UIControlState)state {
    [_customImageEdgeInsets
     setObject:[NSValue valueWithUIEdgeInsets:imageEdgeInsets]
     forKey:@(state)];
}

#pragma mark - Private

- (void)setRealTitleEdgeInsets:(UIEdgeInsets)titleEdgeInsets {
    [super setTitleEdgeInsets:titleEdgeInsets];
}

- (void)setRealImageEdgeInsets:(UIEdgeInsets)imageEdgeInsets {
    [super setImageEdgeInsets:imageEdgeInsets];
}

- (void)updateInsets {
    [self setRealImageEdgeInsets:[self edgeInsetsFromCustomEdgeInsets:_customImageEdgeInsets
                                                         forState:self.state]];

    [self setRealTitleEdgeInsets:[self edgeInsetsFromCustomEdgeInsets:_customTitleEdgeInsets
                                                         forState:self.state]];
}

- (UIEdgeInsets)edgeInsetsFromCustomEdgeInsets:(NSDictionary *)customEdgeInsets
                                      forState:(UIControlState)state {

    UIControlState suitableState = UIControlStateNormal;

    for (NSNumber *aState in customEdgeInsets.keyEnumerator) {
        if (aState.integerValue == (aState.integerValue & state)
            && suitableState < aState.integerValue) {
            suitableState = aState.integerValue;
        }
    }

    NSValue *value = [customEdgeInsets objectForKey:@(suitableState)];

    if (nil != value) {
        return value.UIEdgeInsetsValue;
    }

    return UIEdgeInsetsZero;
}

#pragma mark - NSKeyValueObserving

- (void)observeValueForKeyPath:(NSString *)keyPath
                      ofObject:(id)object
                        change:(NSDictionary *)change
                       context:(void *)context {
    [self updateInsets];
}




@end