dissolvenza in apertura, dissolvenza in animazione su uilabel

Question

Ho un'etichetta che desidero dissolvenza in apertura e quindi dissolvenza in chiusura. Ecco il mio codice:

-(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]; 
} 

da questo codice ottengo questa situazione: la mia etichetta è fade in e quindi non vedo l'animazione dissolvenza. come posso risolverlo?

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 chiamata a setAnimationDidStopSelector dovrebbe essere prima di commettere le animazioni:

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

scoreLabel.alpha = 1; 

[UIView commitAnimations];