vignesh kumar vignesh kumar - 4 months ago 38
iOS Question

Letter by letter animation for UILabel?

I want to animate the UILable when the text value is changing. I want it to show the changed text value character by character.

Answer

Try this prototype function:

- (void)animateLabelShowText:(NSString*)newText characterDelay:(NSTimeInterval)delay
{    
    [self.myLabel setText:@""];

    for (int i=0; i<newText.length; i++)
    {
        dispatch_async(dispatch_get_main_queue(),
        ^{
            [self.myLabel setText:[NSString stringWithFormat:@"%@%C", self.myLabel.text, [newText characterAtIndex:i]]];
        });

        [NSThread sleepForTimeInterval:delay];
    }
}

and call it in this fashion:

dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_LOW, 0),
^{
    [self animateLabelShowText:@"Hello Vignesh Kumar!" characterDelay:0.5];
});