warning:performSelector may cause a leak because its selector is unknown

在ARC项目中使用 performSelector: withObject: 函数出现“performSelector may cause a leak because its selector is unknown”。在stackoverflow找到了一个解决方案，地址：http://stackoverflow.com/questions/7017281/performselector-may-cause-a-leak-because-its-selector-is-unknown。

主要是警告信息，在非ARC项目中没有这个警告。如果是在某一处修改只需要加入下列代码：

#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Warc-performSelector-leaks"
    [self.ticketTarget performSelector: self.ticketAction withObject: self];//此处是你调用函数的地方
#pragma clang diagnostic pop

如果在程序中多处使用，可以写一个宏定义，如下：

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

如果没有返回结果，可以直接按如下方式调用：

SuppressPerformSelectorLeakWarning(
    [_target performSelector:_action withObject:self]
);

如果要返回结果，可以按如下方式调用:

id result;
SuppressPerformSelectorLeakWarning(
    result = [_target performSelector:_action withObject:self]
);

warning:performSelector may cause a leak because its selector is unknown