fade in, fade out animation to uilabel

Question

tengo una etiqueta que quiero desvanecer y luego desvanecerme. aquí es mi código:

-(void) fadein 
{ 
    scoreLabel.alpha = 0; 
    [UIView beginAnimations:nil context:nil]; 
    [UIView setAnimationCurve:UIViewAnimationCurveEaseIn]; 
    [UIView setAnimationDuration:2]; 
    scoreLabel.alpha = 1; 
    [UIView commitAnimations]; 
    [UIView setAnimationDidStopSelector:@selector(animationDidStop:finished:context:)]; 
} 



-(void)animationDidStop:(NSString *)animationID finished:(NSNumber *)finished context:(void *)context { 
    [UIView beginAnimations:nil context:nil]; 
    [UIView setAnimationDuration:2]; 
scoreLabel.alpha = 0; 
[UIView commitAnimations]; 
} 

de este código me sale esta situación: mi sello es intensificar y entonces yo no veo la animación desvanecimiento. ¿cómo puedo solucionarlo?

Answer 1

-(void) fadein 
{ 
    scoreLabel.alpha = 0; 
    [UIView beginAnimations:nil context:nil]; 
    [UIView setAnimationCurve:UIViewAnimationCurveEaseIn]; 

    //don't forget to add delegate..... 
    [UIView setAnimationDelegate:self]; 

    [UIView setAnimationDuration:2]; 
    scoreLabel.alpha = 1; 

    //also call this before commit animations...... 
    [UIView setAnimationDidStopSelector:@selector(animationDidStop:finished:context:)]; 
    [UIView commitAnimations]; 
} 



-(void)animationDidStop:(NSString *)animationID finished:(NSNumber *)finished context:(void *)context { 
{ 
    [UIView beginAnimations:nil context:nil]; 
    [UIView setAnimationDuration:2]; 
    scoreLabel.alpha = 0; 
    [UIView commitAnimations]; 
} 

Answer 2

La llamada a setAnimationDidStopSelector debe ser antes de cometer las animaciones:

[UIView beginAnimations:nil context:nil]; 
[UIView setAnimationCurve:UIViewAnimationCurveEaseIn]; 
[UIView setAnimationDuration:2]; 
[UIView setAnimationDidStopSelector:@selector(animationDidStop:finished:context:)]; 

scoreLabel.alpha = 1; 

[UIView commitAnimations];