NSTimer on a label

im working with iphone sdk and i 开发者_JS百科got to show a label when the user clik a button but after some time the label deseapear, can i do that?

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Use NSObject's performSelector: withObject: afterDelay: for that - it will setup NSTimer that performs selector for you. In button click handler:

...
myLabel.hidden = NO;
[self performSelector:@selector(hideView:) withObject:myLabel afterDelay:3];
...

- (void) hideView:(UIView*)inView{
   // You can also add animation here
   view.hidden = YES;
}

Note, that it is not guaranteed that hideView: will get called exactly after 3 sec.