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PODrawing linear gradient in a rect works on iOS 5.x but not 4.x
 

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  1. PODrawing linear gradient in a rect works on iOS 5.x but not 4.x
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    <p>I have some code that I use to fill a view with a linear gradient, I've refactored this into a helper method. This draws fine on iOS 5.x but when I tried running on 4.3.5 I don't get anything. I've checked all the CG calls and they all are supported on 4.0 or older, it look so simplistic I can't see why it doesn't work on 4.x.</p> <pre><code>- (void)drawRect:(CGRect)rect { CGContextRef context = UIGraphicsGetCurrentContext(); CGColorRef startColor = [UIColor lightGrayColor].CGColor; CGColorRef endColor = [UIColor blackColor].CGColor; CGRect paperRect = self.frame; [GraphicsHelpers drawLinearGradientWithContext:context inRect:paperRect startColor:startColor endColor:endColor]; } </code></pre> <p>Here is that method</p> <pre><code>+ (void)drawLinearGradientWithContext:(CGContextRef)context inRect:(CGRect)rect startColor:(CGColorRef)startColor endColor:(CGColorRef)endColor { CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB(); CGFloat locations[] = { 0.0, 1.0 }; NSArray *colors = [NSArray arrayWithObjects:(__bridge id)startColor, (__bridge id)endColor, nil]; CGGradientRef gradient = CGGradientCreateWithColors(colorSpace, (__bridge CFArrayRef) colors, locations); CGPoint startPoint = CGPointMake(CGRectGetMidX(rect), CGRectGetMinY(rect)); CGPoint endPoint = CGPointMake(CGRectGetMidX(rect), CGRectGetMaxY(rect)); CGContextSaveGState(context); CGContextAddRect(context, rect); CGContextClip(context); CGContextDrawLinearGradient(context, gradient, startPoint, endPoint, 0); CGContextRestoreGState(context); CGGradientRelease(gradient); CGColorSpaceRelease(colorSpace); </code></pre> <p>}</p> <p>I found most of this code <a href="http://www.raywenderlich.com/2033/core-graphics-101-lines-rectangles-and-gradients" rel="nofollow">here</a> and was working great until I started testing on older OS versions as I'm close to release.</p>
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    1. COFor your paperRect, I would use `self.bounds` rather than `self.frame`.
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