该警告提示信息,是说,设置了代理对象,但是并没有继承它的代理。下图中,可以看出,警告信息提示我们没有继承“CALayerDelegate”的代理。

解决方法,很简单,(在 @interface 文件中继承它的代理即可)如下:

重新编译一下就可以了。

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