public

Category on UIButton to clip background image to background before setting it

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UIButton+ClipBackgroundImageToBounds.m
Objective-C
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//
// UIView+ClipBackgroundImageToBounds.m
//
// Created by Barry Allard on 2013-06-18.
// Copyright (c) 2013 Stealth Mode Industries LLC. All rights reserved.
//
// Based on http://stackoverflow.com/questions/262156/uiimage-rounded-corners
//
// MIT License
 
#import "UIButton+ClipBackgroundImageToBounds.h"
 
@implementation UIButton (ClipBackgroundImageToBounds)
- (void)setBackgroundImageClippedToBounds:(UIImage *)image forState:(UIControlState)state
{
if (!( ! self.clipsToBounds && self.layer.cornerRadius != 0.0f )) {
// Nothing special to do
[self setBackgroundImage:image forState:state];
return;
}
// Begin a new image that will be the new image with the rounded corners
// (here with the size of an UIImageView)
UIGraphicsBeginImageContextWithOptions(self.bounds.size, NO, 1.0);
// Add a clip before drawing anything, in the shape of an rounded rect
[[UIBezierPath bezierPathWithRoundedRect:self.bounds
cornerRadius:self.layer.cornerRadius] addClip];
 
// Draw your image
[image drawInRect:self.bounds];
// Get the image, here setting the UIImageView image
UIImage* clippedBackgroundImage = UIGraphicsGetImageFromCurrentImageContext();
// Lets forget about that we were drawing
UIGraphicsEndImageContext();
// Do what we came here to do
[self setBackgroundImage:clippedBackgroundImage forState:state];
}
@end
UIView+ClipBackgroundImageToBounds.h
Objective-C
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//
// UIView+ClipBackgroundImageToBounds.h
//
// Created by Barry Allard on 2013-06-18.
// Copyright (c) 2013 Stealth Mode Industries LLC. All rights reserved.
//
// Based on http://stackoverflow.com/questions/262156/uiimage-rounded-corners
//
// MIT License
 
#import <UIKit/UIKit.h>
#import <QuartzCore/QuartzCore.h>
 
@interface UIButton (ClipBackgroundImageToBounds)
- (void)setBackgroundImageClippedToBounds:(UIImage *)image forState:(UIControlState)state;
@end

This probably should be refactored as a category on UIView, and then one category for each control.

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