鍵盤事件 - 使用NSNotificationCenter

iOS中有NSNotificationCenter可以接收Notify
以鍵盤事件的範例如下：

在viewWillAppear中註冊Notification
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[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardDidShow:) name:UIKeyboardDidShowNotification object:nil];
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardDidHide:) name:UIKeyboardDidHideNotification object:nil];
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記得在viewWillDisappear中移除
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[[NSNotificationCenter defaultCenter] removeObserver:self];
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Actions:

[sea:javaCode]
-(void)keyboardDidShow:(NSNotification*)notif{
NSLog(@"keyboard show");
}

-(void)keyboardDidHide:(NSNotification *)notif{
NSLog(@"keyboard hide");
}
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