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在我的应用程序,我得到以下错误控制台:CGContextAddPath控制台错误?
May 1 22:06:59 iPhone-4S app[93660] <Error>: CGContextAddPath: invalid context 0x0
May 1 22:06:59 iPhone-4S app[93660] <Error>: clip: invalid context 0x0
在这可以发生在以下两种方法来调整或圆边添加到一个UIImage的唯一地区。下面是方法:
- (UIImage*)imageWithImage:(UIImage*)image scaledToSize:(CGSize)newSize {
// Create a graphics image context
UIGraphicsBeginImageContext(newSize);
// Tell the old image to draw in this new context, with the desired
// new size
[image drawInRect:CGRectMake(0,0,newSize.width,newSize.height)];
// Get the new image from the context
UIImage* newImage = UIGraphicsGetImageFromCurrentImageContext();
// End the context
UIGraphicsEndImageContext();
// Return the new image.
return newImage;
}
- (UIImage*)roundCorneredImage: (UIImage*)orig radius:(CGFloat) r {
UIGraphicsBeginImageContextWithOptions(orig.size, NO, 0);
[[UIBezierPath bezierPathWithRoundedRect:(CGRect){CGPointZero, orig.size}
cornerRadius:r] addClip];
[orig drawInRect:(CGRect){CGPointZero, orig.size}];
UIImage* result = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return result;
}
这两种方法都是从UIViewControllers内打电话,我肯定的UIImage的不是零。
这是否有任何理由发生?
谢谢!
你的意思是我加入它的CGSize和/或半径参数? –
是的,如果你调用UIGraphicsBeginImageContextWithOptions与零大小,你会得到完全相同的错误,所以我认为你的上下文是空的。 –