Typing effect with attributed string

Question

I found this code to animate a label with a typing effect. I'm trying to adapt it for attributed strings.

https://stackoverflow.com/a/11687530/1813525

I tried this but I assume that i'm just recreating the same code based on the string of an attributed string :

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

    for (int i=0; i<newText.length; i++)
    {
        dispatch_async(dispatch_get_main_queue(),
                       ^{
        [self.mainLabel setAttributedText:[[NSAttributedString alloc]initWithString:[NSString stringWithFormat:@"%@%C", [self.mainLabel.attributedText string], [[newText string] characterAtIndex:i]] attributes:nil]];
                       });



        [NSThread sleepForTimeInterval:delay];
    }
}

Any idea how I could preserve the formatting of my attributed text newText

Thanks for your help.

it doesnt keep the formating of my attributed text

rushelmet
– rushelmet

2016-01-25 18:02:45 +00:00
Commented Jan 25, 2016 at 18:02 — rushelmet
– rushelmet, Commented Jan 25, 2016 at 18:02

rmaddy · Accepted Answer · 2016-01-25 18:04:42Z

1

Two issues (assuming you call animateLabelShowText:characterDelay: on a background thread).

You call setText:@"" on the background thread. Don't do that.
You are building each new attributed string incorrectly.

Try this:

- (void)animateLabelShowText:(NSAttributedString*)newText characterDelay:(NSTimeInterval)delay
{
    for (NSInteger i = 0; i <= newText.length; i++)
    {
        dispatch_async(dispatch_get_main_queue(), ^{
            NSAttributedString *str = [newText attributedSubstringFromRange:NSMakeRange(0, i)];
            self.mainLabel.attributedText = str;
        });

        [NSThread sleepForTimeInterval:delay];
    }
}

answered Jan 25, 2016 at 18:04

rmaddy

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1 Comment

rmaddy Over a year ago

Glad I could help. Please don't forget to accept an answer that solves your issue.

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