Property 'c' cannot be found in forward class object 'CALayer *"

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sdk版本升级到5.1，在项目中设置view的layer属性时，会发生错误,"Property 'c' cannot be found in forward class object 'CALayer *",这时需要引入

#import <QuartzCore/CALayer.h>。

在以前的sdk版本中，不需要引入就可以设置layer的属性，但是到了5.1，不引入就会编译通不过了。

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