performSelector may cause a leak because its selector is unknown

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

第一种解决办法：

As a workaround until the compiler allows overriding the warning, you can use the runtime

objc_msgSend(_controller, NSSelectorFromString(@"someMethod"));

instead of

[_controller performSelector:NSSelectorFromString(@"someMethod")];

You'll have to

#import <objc/message.h>

第二种：

To ignore the error only in the file with the perform selector, add a #pragma as follows:

#pragma clang diagnostic ignored "-Warc-performSelector-leaks"

第三种：

#define SUPPRESS_PERFORM_SELECTOR_LEAK_WARNING(code)                        \
    _Pragma("clang diagnostic push")                                        \
    _Pragma("clang diagnostic ignored \"-Warc-performSelector-leaks\"")     \
    code;                                                                   \
    _Pragma("clang diagnostic pop")                                         \


SUPPRESS_PERFORM_SELECTOR_LEAK_WARNING(
    return [_target performSelector:_action withObject:self]
);

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