ios, manual end caps

BackButton.m

#import "BackButton.h"

@implementation BackButton


-(void) awakeFromNib {
	[self setBackgroundImage:nil forState:UIControlStateNormal];
}

-(void) drawRect:(CGRect)rect {
	CGContextRef context = UIGraphicsGetCurrentContext();
	CGRect bounds = [self bounds];
	
	int leftCapWidth = 18;
	int rightCapWidth = 5;
	int height = 32;
	
	// Assume retina image so *2 coordinates
	CGImageRef background = [[UIImage imageNamed:@"backbutton.png"] CGImage];
	CGImageRef leftCap = CGImageCreateWithImageInRect(background, CGRectMake(0.0, 0.0, leftCapWidth*2, height*2));
	CGImageRef middleSection = CGImageCreateWithImageInRect(background, CGRectMake(leftCapWidth*2, 0.0, leftCapWidth, height*2));
	CGImageRef rightCap = CGImageCreateWithImageInRect(background, CGRectMake(CGImageGetWidth(background)-rightCapWidth*2, 0.0, rightCapWidth*2, height*2));
	
	CGContextDrawImage(context, CGRectMake(0.0, 0, leftCapWidth, CGRectGetHeight(bounds)), leftCap);
	CGContextDrawImage(context, CGRectMake(CGRectGetWidth(bounds)-rightCapWidth, 0, rightCapWidth, CGRectGetHeight(bounds)), rightCap);
	CGContextDrawImage(context, CGRectMake(leftCapWidth, 0, CGRectGetWidth(bounds)-rightCapWidth-leftCapWidth, CGRectGetHeight(bounds)), middleSection);
	
	CGImageRelease(leftCap);
	CGImageRelease(middleSection);
	CGImageRelease(rightCap);
}

@end