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我想为IKImageView添加棋盘背景以查看透明图像。 我想设置的CALayer与棋盘图像与消息IKImageView setOverlay:forType将背景添加到IKImageView
CFURLRef imageURL = CFBundleCopyResourceURL(CFBundleGetMainBundle(),(CFStringRef)@"bgImage.png", NULL, NULL);
CGImageSourceRef imageSource = CGImageSourceCreateWithURL(imageURL,NULL);
CFRelease(imageURL);
CGImageRef image = CGImageSourceCreateImageAtIndex(imageSource, 0,NULL);
CFRelease(imageSource);
CALayer *bgLayer = [[CALayer alloc] init ];
[bgLayer setContents:image ];
[ imageView setOverlay:bgLayer forType:IKOverlayTypeBackground ];
,但不起作用。我在控制台中收到此消息
could not add '<CALayer: 0x101d039a0>' linkedTo 'kIKRootLayerType'
有谁知道什么是错的或任何workarround?
谢谢