"performSelector may cause a leak because its selector is unknown"解决方案

最新推荐文章于 2020-04-01 15:21:01 发布

原创最新推荐文章于 2020-04-01 15:21:01 发布 · 146 阅读

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本文探讨了Objective-C中使用自动引用计数(Automatic Reference Counting, ARC)时可能出现的内存泄露问题，并提供了两种解决方案：一种是在代码中替换performSelector:为objc_msgSend()，另一种是在LLVM3.0编译器中使用特定的预处理指令来抑制警告。

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Because you're dynamically assigning action, the compiler sees a possible leak with ARC. In the future, the LLVM compiler may allow you to suppress the warning. Until then, you can avoid the warning by using the runtime's objc_msgSend() instead of -performSelector:.

First, import the runtime message header

#import <objc/message.h>

Next, replace performSelector: with objc_msgSend()

    // [object performSelector:action];
    objc_msgSend(object, action);

或者禁止warning

In the LLVM 3.0 compiler in Xcode 4.2 you can suppress the warning as follows:

#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Warc-performSelector-leaks"
    [object performSelector:action];
#pragma clang diagnostic pop

Thanks to Scott Thompson (about this similar question: performSelector may cause a leak because its selector is unknown) for the answer.