解决ARC下performselector-may-cause-a-leak-because-its-selector-is-unknown 警告

在ARC下使用 

[theTarget performSelector:theTarget withObject:Nil];

会出现警告：performselector-may-cause-a-leak-because-its-selector-is-unknown 

解决方法：

1：添加如下宏

#define SuppressPerformSelectorLeakWarning(Stuff) 
do { 
_Pragma("clang diagnostic push") 
_Pragma("clang diagnostic ignored "-Warc-performSelector-leaks"") 
Stuff; 
_Pragma("clang diagnostic pop") 
} while (0)

2：使用宏

        SuppressPerformSelectorLeakWarning([theTarget performSelector:theAction withObject:@"hello"]);

　　

参考：http://stackoverflow.com/questions/7017281/performselector-may-cause-a-leak-because-its-selector-is-unknown