抑制“'...”被弃用“当使用responsesToSelector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+：

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

在这种情况下，10.5及以上将使用 removeItemAtPath：error： code>和10.4将使用 removeFileAtPath：handler：。很好，但是我仍然得到旧方法的编译器警告：

 警告：'removeFileAtPath：handler：'已弃用[ -  Wdeprecated code> if（[... responsesToSelector：@ ...] 
   
 < （...）]）{...} else {...} 提示编译器（Clang）不在该行上发出警告？
 
 
 
没有，是否有一种方法来标记要忽略的行 -Wdeprecated-declarations ？
 
 
 
 
 
 
看到一些答案后，让我澄清一下，让编译器不知道我在做什么不是一个有效的解决方案。
解决方案
我发现一个例子在Clang编译器用户手册中，让我忽略警告：
  if（[fileManager responsesToSelector：@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诊断pop 
} 
  
 
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];
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]
Is there a syntax of if([… respondsToSelector:@selector(…)]){ … } else { … } that hints the compiler (Clang) to not warn on that line?

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



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.
解决方案
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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