iOS開發UI篇----UI高級之鍵盤通知

/*

      1.監聽鍵盤通知 UIKeyboardWillChangeFrameNotification

      2.實現監聽通知的方法

      3.調整控制器View的位置

      4.當控制器銷燬的時候移除通知

     */

//監聽鍵盤通知的方法

/*

 UIKeyboardAnimationCurveUserInfoKey = 7;  鍵盤彈出時候，執行動畫的節奏

 UIKeyboardAnimationDurationUserInfoKey = "0.25"; 鍵盤動畫執行的時間

 UIKeyboardBoundsUserInfoKey = "NSRect: {{0, 0}, {375, 258}}";  鍵盤大小

 UIKeyboardCenterBeginUserInfoKey = "NSPoint: {187.5, 796}";  鍵盤開始的時候中心點位置

 UIKeyboardCenterEndUserInfoKey = "NSPoint: {187.5, 538}";    鍵盤結束的時候中心點位置

 UIKeyboardFrameBeginUserInfoKey = "NSRect: {{0, 667}, {375, 258}}"; 鍵盤開始時候的frame

 UIKeyboardFrameEndUserInfoKey = "NSRect: {{0, 409}, {375, 258}}";   鍵盤結束的時候的frame

 

//  1.監聽鍵盤通知 UIKeyboardWillChangeFrameNotification

    

    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillChangeFrameNotification:) name:UIKeyboardWillChangeFrameNotification object:nil];

//2.實現監聽通知的方法

- (void) keyboardWillChangeFrameNotification:(NSNotification *) notification

{

//    NSLog(@"%@",notification.userInfo);

    

// 鍵盤開始位置

    CGRect beginFrame  = [notification.userInfo[UIKeyboardFrameBeginUserInfoKey] CGRectValue];

// 鍵盤結束的位置

    CGRect endFrame = [notification.userInfo[UIKeyboardFrameEndUserInfoKey] CGRectValue];

//  取出控制器view的frame

    CGRect viewFrame = self.view.frame;

//  調整控制器view的y座標

    viewFrame.origin.y += endFrame.origin.y - beginFrame.origin.y;

//  設置控制器的View的frame

    self.view.frame = viewFrame;

}

//移除監聽者

-(void)dealloc{

    [[NSNotificationCenter defaultCenter]removeObserver:self];

}