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
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
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