自行参考以下文章：
1. https://www.lee1994.com
2. http://www.jianshu.com/p/efbc8619d56b
3. http://www.jianshu.com/p/c355cc4b12c2?utm_campaign=maleskine&utm_content=note&utm_medium=reader_share&utm_source=weibo
4. http://www.cocoachina.com/ios/20170915/20580.html
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