界面自动弹出键盘的问题

Under that scenario, when the next time this view controller was appear again, the UIKit will be smart enough to restore the previous view state if it's not dealloced.

http://stackoverflow.com/questions/23075747/why-the-keyboard-was-automatically-popped-out-when-the-viewcontroller-was-pushed/23121140#23121140

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