让编译器对一些警告闭嘴

一、方法启用告警

    #pragma clang diagnostic push
    #pragma clang diagnostic ignored "-Wdeprecated-declarations"
    //code这里插入相关的代码

    #pragma clang diagnostic pop

 

2.不兼容指针类型

     #pragma clang diagnostic push

     #pragma clang diagnostic ignored "-Wincompatible-pointer-types"

     //code这里插入相关的代码

     #pragma clang diagnostic pop

3.retain cycle

     #pragma clang diagnostic push

     #pragma clang diagnostic ignored "-Warc-retain-cycles"

     //code这里插入相关的代码

     #pragma clang diagnostic pop

4.未使用变量

     #pragma clang diagnostic push

     #pragma clang diagnostic ignored "--Wunused-variable"

     //code这里插入相关的代码

     #pragma clang diagnostic pop

5.selector中使用了不存在的方法名（在使用反射机制经过类名建立类对象的时候会须要的）

     #pragma clang diagnostic push

     #pragma clang diagnostic ignored "-Wundeclared-selector"

     //code这里插入相关的代码

     #pragma clang diagnostic pop

 

 

 

更多内容，请查阅

http://clang.llvm.org/docs/UsersManual.html#diagnostics_pragmas

http://nshipster.com/pragma/

http://www.cocoachina.com/applenews/devnews/2013/0731/6707.html