如何取得Keyboard Rect

註冊 keyboard 通知 

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardDidShow:) name:UIKeyboardDidShowNotification object:nil];  

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardDidHide:) name:UIKeyboardDidHideNotification object:nil];

//鍵盤顯示

-(void)keyboardDidShow:(id)sender

{

    NSDictionary * info = [sender userInfo];  

    NSValue * beginValue = [info objectForKey:UIKeyboardFrameBeginUserInfoKey];

    NSValue * endValue = [info objectForKey:UIKeyboardFrameEndUserInfoKey];

    CGRect beginRect = [beginValue CGRectValue];

    CGRect endRect = [endValue CGRectValue];

    

    double duration = [[info objectForKey:UIKeyboardAnimationDurationUserInfoKey] doubleValue];

    int curve = [[info objectForKey:UIKeyboardAnimationCurveUserInfoKey] intValue];

    

    [UIView beginAnimations:@"keyboardDidShow" context:nil];

    [UIView setAnimationDuration:duration];

    [UIView setAnimationCurve:curve];

    

    //鍵盤剛要升起的Rect

    NSLog(@"keyboardDidShow Begin:%@",NSStringFromCGRect(beginRect));

       //鍵盤升起完成的Rect

    NSLog(@"keyboardDidShow End:%@",NSStringFromCGRect(endRect));

    

    [UIView commitAnimations];

}

//鍵盤隱藏

-(void)keyboardDidHide:(id)sender

{

    NSDictionary * info = [sender userInfo];  

    NSValue * beginValue = [info objectForKey:UIKeyboardFrameBeginUserInfoKey];

    NSValue * endValue = [info objectForKey:UIKeyboardFrameEndUserInfoKey];

    CGRect beginRect = [beginValue CGRectValue];

    CGRect endRect = [endValue CGRectValue];

    

    double duration = [[info objectForKey:UIKeyboardAnimationDurationUserInfoKey] doubleValue];

    int curve = [[info objectForKey:UIKeyboardAnimationCurveUserInfoKey] intValue];

    

    [UIView beginAnimations:@"keyboardDidShow" context:nil];

    [UIView setAnimationDuration:duration];

    [UIView setAnimationCurve:curve];

    

    //鍵盤剛要落下的Rect

    NSLog(@"keyboardDidHide Begin:%@",NSStringFromCGRect(beginRect));

      //鍵盤落下完成的Rect

    NSLog(@"keyboardDidHide End:%@",NSStringFromCGRect(endRect));

    

    [UIView commitAnimations];

}