http://www.cnblogs.com/SoulKai/p/6056659.html
//www.greatytc.com/p/cbd650c9daad
http://blog.csdn.net/zz110731/article/details/52712330
http://www.cnblogs.com/SoulKai/p/6056659.html
http://www.cocoachina.com/swift/20160720/17120.html
//www.greatytc.com/p/e9b502f5101f
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