Fade In and Fade Out

fade.m

    CATransform3D transform = CATransform3DMakeScale(0.001, 0.001, 1.0);
    hintView.layer.transform = transform;
    hintView.alpha = 0;
    transform = CATransform3DMakeScale(1.0, 1.0, 1.0);
    [UIView beginAnimations:nil context:nil];
    [UIView setAnimationDuration:0.5];
    [UIView setAnimationCurve:UIViewAnimationCurveEaseInOut];
    hintView.layer.transform = transform;
    hintView.alpha = 1;
    [UIView commitAnimations];

    CATransform3D transform = CATransform3DMakeScale(0.001, 0.001, 0.001);
    [UIView beginAnimations:nil context:nil];
    [UIView setAnimationDelay:0.0];
    [UIView setAnimationDuration:.5];
    [UIView setAnimationCurve:UIViewAnimationCurveEaseInOut];
    hintView.layer.transform = transform;
    hintView.alpha = 0;
    [UIView commitAnimations];