http://www.cocoachina/ios/20150206/11121.html
CGColorSpaceRelease(colorS); CGColorRelease(colo);
Objective-C类型的对象才支持arc,其他类型的对象,创建了就需要释放。
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Reference-counted object is used after it is released 对象在被释放之后使用了
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Potential leak of an object stored into ‘colorS'
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