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参考：http://www.jianshu.com/p/414bb5a53139

https://github.com/raywenderlich/objective-c-style-guide

http://www.csdn.net/article/2015-06-01/2824818-objective-c-style-guide/1

http://www.csdn.net/article/2015-06-01/2824818-objective-c-style-guide/2

http://www.csdn.net/article/2015-06-01/2824818-objective-c-style-guide/3

http://www.csdn.net/article/2015-06-01/2824818-objective-c-style-guide/4

http://www.csdn.net/article/2015-06-01/2824818-objective-c-style-guide/5

2.关于编译器：关闭警告：

#pragma clang diagnostic push

#pragma clang diagnostic ignored "-Warc-performSelector-leaks"

[myObj performSelector:mySelector withObject:name];

#pragma clang diagnostic pop

3.忽略没用的变量

#pragma unused (foo)

明确定义错误和警告

#error Whoa, buddy, you need to check for zero here!

#warning Dude, don't compare floating point numbers like this!

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