让编译器对一些警告闭嘴

1.方法弃用告警

#pragma clang diagnostic push

#pragma clang diagnostic ignored "-Wdeprecated-declarations"

[TestFlight setDeviceIdentifier:[[UIDevice currentDevice] uniqueIdentifier]];

#pragma clang diagnostic pop

2.不兼容指针类型

#pragma clang diagnostic push

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

//

#pragma clang diagnostic pop

3.retain cycle

// completionBlock is manually nilled out in AFURLConnectionOperation to break the retain cycle.

#pragma clang diagnostic push

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

self.completionBlock = ^ {

...

};

#pragma clang diagnostic pop

4.未使用变量

#pragma clang diagnostic push

#pragma clang diagnostic ignored "-Wunused-variable"

int a;

#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