performSelector may cause a leak because its selector is unknown

转载于 2014-11-26 11:42:06 发布 · 549 阅读

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本文详细介绍了在Objective-C编程中遇到performSelector可能引发内存泄漏警告时的三种解决办法，并提供了相应的代码示例。通过使用runtime替代performSelector调用，忽略特定文件中的警告，或者自定义宏来抑制警告，可以有效避免内存泄漏问题。

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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] );