Display Timer letter by letter iphone

Want i 开发者_如何学编程wanna do is to display a label letter by letter like in some games we can find on the app store, but i have no idea on how to do this. May be using a timer ? but how can i tell my label to add only one letter from a string ? ?

Thanks to all !

Something like that should work

UILabel* label; //Your label
NSString* myLongString; //Your string
for (NSUInteger index = 0; index > [myLongString length] ; index ++) {
    NSString* subString = [myLongString substringToIndex:index]; //The part you want to show;
    [label performSelector:@selector(setText:) withObject:subString afterDelay:index];
}

Basically, you're just setting the text to a part of your string after a certain delay.

Use a timer and append a letter to the label's text, i.e.

yourLabel.text = @"H";

then

yourLabel.text = @"He";

then

yourLabel.text = @"Hel";

then

yourLabel.text = @"Hell";

then

yourLabel.text = @"Hello";

You might just want to have a look at delayed messaging with the performSelector: family instead of NSTimer.