iOS first Article-xcode6.2 keyboard cannot be tuned out

iOS first post

I don't know if anyone has ever met an iOS code call keyboard (keyboard) does not come out of the situation, anyway I was met, according to the official documentation of the call keyboard event is very simple actually:

After I used, do not know why, the keyboard is not displayed, look at other people's code are commissioned, I think the official website also did not require to entrust ah, so all kinds of Google and Baidu, the result is still like that, is not displayed, for all kinds of writing are not, finally see someone code run environment is Xcode4.6 Mine is 6.2, I changed Xcode to 5.0, and then change back to 6.2 is normal, or put on the hook:

At this point the problem is over, I hope that such problems can not appear, to leave some marks, hoping to facilitate others also convenient for themselves, iOS in progress.

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iOS first Article-xcode6.2 keyboard cannot be tuned out