1.https://developer.apple.com/library/ios/documentation/UserExperience/Conceptual/MobileHIG/index.html
2.https://developer.apple.com/library/ios/documentation/UserExperience/Conceptual/MobileHIG/Anatomy.html#//apple_ref/doc/uid/TP40006556-CH24-SW1
3.http://tutuge.me/2015/05/23/autolayout-example-with-masonry/
好好看看，控件布局
4.http://so.iqiyi.com/so/q_ios%E5%BA%94%E7%94%A8%E7%A8%8B%E5%BA%8F%E5%BC%80%E5%8F%91%E5%85%A5%E9%97%A8%E8%A7%86%E9%A2%91%E6%95%99%E7%A8%8B?source=input&sr=168369164374