Improperly released graphics context causes crash

[Corey Floyd]

In the method below, the context was released without being the owner. Instead I used the matching UIGraphicsEndImageContext() function to return the graphics stack to the correct state.

This bug causes unpredictable crashes since there is an overreleased context floating around on the stack.

Fixed implementation below:

- (UIImage*)imageAddingImage:(UIImage*)image offset:(CGPoint)offset
{
    CGSize size = self.size;
    CGFloat scale = self.scale;

    size.width *= scale;
    size.height *= scale;

    UIGraphicsBeginImageContext(size);

    [self drawInRect:CGRectMake( 0, 0, size.width, size.height)];

    [image drawInRect:CGRectMake(scale * offset.x, scale * offset.y, image.size.width * scale, image.size.height * scale)];

    CGContextRef context = UIGraphicsGetCurrentContext();
    CGImageRef bitmapContext = CGBitmapContextCreateImage(context);
    UIImage *destImage = [UIImage imageWithCGImage:bitmapContext scale:image.scale orientation:UIImageOrientationUp];
    UIGraphicsEndImageContext();
    CGImageRelease(bitmapContext);

    return destImage;
}

[Joan Martin]

Ups, thanks! Cocoapod version 1.0.3 submited!