使用格式

 #pragma clang diagnostic push
   #pragma clang diagnostic ignored "-相關(guān)命令"
   # //需要操作的代碼
#pragma clang diagnostic pop

• 忽略棄用的警告

#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wdeprecated-declarations"
    UIAlertView *alertViewTmp = [[UIAlertView alloc]initWithTitle:@"" message:@"" delegate:nil cancelButtonTitle:@"" otherButtonTitles:@"", nil];
    [alertViewTmp show];
#pragma clang diagnostic pop

• 忽略不兼容指針類型

#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wincompatible-pointer-types"
    //
#pragma clang diagnostic pop

• 循環(huán)引用

#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Warc-retain-cycles"
//    self.completionBlock = ^ {
//        ...
//    };
#pragma clang diagnostic pop

• 未使用變量

#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wunused-variable"
    int a;
#pragma clang diagnostic pop

• 未使用default

#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wcovered-switch-default"
//    switch (style) {
//        case UITableViewCellStyleDefault:
//        default:
//            return;
//    }
#pragma clang diagnostic pop

參考 Clang's source code