类,方法,协议和nsstring互转

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FOUNDATION_EXPORT NSString *NSStringFromSelector(SEL aSelector);FOUNDATION_EXPORT SEL NSSelectorFromString(NSString *aSelectorName);FOUNDATION_EXPORT NSString *NSStringFromClass(Class aClass);FOUNDATION_EXPORT Class NSClassFromString(NSString *aClassName);FOUNDATION_EXPORT NSString *NSStringFromProtocol(Protocol *proto) NS_AVAILABLE(10_5, 2_0);FOUNDATION_EXPORT Protocol *NSProtocolFromString(NSString *namestr) NS_AVAILABLE(10_5, 2_0);

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