Crossfade NSString text inside a UILabel or UITextField

One of my favourite effect is the so-called crossfade effect.
Well, I made a crossfade animation between two NSStrings in a UIView (actually UILabel or UITextField).


/** Crossfade effect for text.

 @param view A UILabel or UITextField that contains the old text.
 @param text New string to show.
 @param duration Animation duration in milliseconds.
 @return Returns true on success, false otherwise.

 */
+ (BOOL)crossFadeCurrentTextInView:(UIView *)view withNewText:(NSString *)text duration:(CGFloat)duration {
    if (!view) { return NO; }
    // Works only for UILabel or UITextField.
    if ([view isKindOfClass:[UILabel class]] || [view isKindOfClass:[UITextField class]]) {
        CATransition *animation = [CATransition animation];
        animation.duration        = duration;
        animation.type            = kCATransitionFade;
        animation.timingFunction= [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];
        [view.layer addAnimation:animation forKey:@"changeTextTransition"];

        if ([view isKindOfClass:[UILabel class]]) {
            ((UILabel *)view).text = text;
        } else {
            ((UITextField *)view).text = text;
        }

        [view.layer performSelector:@selector(removeAnimationForKey:) withObject:@"changeTextTransition" afterDelay:duration]; // Remove animation.
        return YES;
    }
    return NO;
}


Download the ready-for-use source file (.m) of Crossfade NSString text inside a UILabel or UITextField