抑制“'...' 已被弃用"；使用 RespondsToSelector 时 [英] Suppressing "'…' is deprecated" when using respondsToSelector

问题描述

我通过在运行时选择最新的 API 来支持 10.4+:

I'm supporting 10.4+ by picking the most-current API at runtime:

if ([fileManager respondsToSelector:@selector(removeItemAtPath:error:)])
    [fileManager removeItemAtPath:downloadDir error:NULL];
else
    [fileManager removeFileAtPath:downloadDir handler:nil];

在这种情况下，10.5 及更高版本将使用 removeItemAtPath:error:，10.4 将使用 removeFileAtPath:handler:.很好，但我仍然收到旧方法的编译器警告:

In this case, 10.5 and up will use removeItemAtPath:error: and 10.4 will use removeFileAtPath:handler:. Great, but I still get compiler warnings for the old methods:

warning: 'removeFileAtPath:handler:' is deprecated [-Wdeprecated-declarations]

是否有if([... RespondsToSelector:@selector(...)]){ ... } else { ... } 的语法提示编译器(Clang)不要在该行发出警告?

Is there a syntax of if([… respondsToSelector:@selector(…)]){ … } else { … } that hints the compiler (Clang) to not warn on that line?

如果没有，有没有办法标记该行以被 -Wdeprecated-declarations 忽略?

If not, is there a way to tag that line to be ignored for -Wdeprecated-declarations?

在看到一些答案之后，让我澄清一下，让编译器混淆成不知道我在做什么并不是一个有效的解决方案.

After seeing some of the answers, let me clarify that confusing the compiler into not knowing what I'm doing is not a valid solution.

推荐答案

我发现 Clang Compiler User's Manual 中的一个示例让我忽略警告:

I found an example in the Clang Compiler User's Manual that lets me ignore the warning:

if ([fileManager respondsToSelector:@selector(removeItemAtPath:error:)]) {
    [fileManager removeItemAtPath:downloadDir error:NULL];
} else {
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wdeprecated-declarations"
    [fileManager removeFileAtPath:downloadDir handler:nil];
#pragma clang diagnostic pop
}

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