animate my custom number pad

I create my own number pad view successfully and I want to simulate the default number pad appear animated effect, but it can't work fine, it can't animate as default number pad, how do I modify?

I have a UITextField call "fNumber" and a custom number pad view call myNumberPadView and created by interface builder, when the "fNumber" is focued I will show the myNumberPadView animated, so I code as follow:

 - (BOOL)textFieldShouldBeginEditing:(UITextField *)textField {
    if (textField == fNumber){
        CGRect frame = CGRectMake(0, 270, 320, 230);
        myNumberPadView.frame = frame;
        [UIView beginAnimations:nil context:NULL];
        [UIView setAnimationDuration:1.75];
        frame.origin.x = 0;
        frame.origin.y = 270; 
        [UIView commitAnimations];
        [self.view addSubview:myNumberPadView];
    }
    return NO;
}

The "myNu开发者_如何转开发mberPadView" is show as a subview, it doesn't the "animate" effect as the default number pad, how can to make it to "animate" appear?

---

in the animation block, just set the new frame to your custom numpad. smth like

- (BOOL)textFieldShouldBeginEditing:(UITextField *)textField {
    if (textField == fNumber){
        CGRect frame = CGRectMake(0, 480, 320, 230);
        [myNumberPadView setFrame:frame];
        [self.view addSubview:myNumberPadView];
        [UIView beginAnimations:nil context:NULL];
        [UIView setAnimationDuration:1.75];
        [myNumberPadView setFrame:CGRectMake(0, 270, 320, 230)]; 
        [UIView commitAnimations];
    }
    return NO;
}

---

- (BOOL)textFieldShouldBeginEditing:(UITextField *)textField {
if (textField == fNumber){
    CGRect frame = CGRectMake(0, 270, 320, 230);
    myNumberPadView.frame = frame;
    [UIView beginAnimations:nil context:NULL];
    [UIView setAnimationDuration:1.75];
    frame.origin.x = 0;
    frame.origin.y = 270; 
   // [UIView commitAnimations];
    [self.view addSubview:myNumberPadView];//Place this before the line  [UIView commitAnimations];
    [UIView commitAnimations];
}
return NO;
}