以下两个方法的分析可以参考链接:https://www.jianshu.com/p/c37f5d97b07e
+ (BOOL)instancesRespondToSelector:(SEL)aSelector;
- (BOOL)respondsToSelector:(SEL)aSelector
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以下两个方法的分析可以参考链接:https://www.jianshu.com/p/c37f5d97b07e
+ (BOOL)instancesRespondToSelector:(SEL)aSelector;
- (BOOL)respondsToSelector:(SEL)aSelector
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