iOS 4.2: Flip immagine utilizzando blocchi animazioni

Question

ho avuto questo pezzo di codice im mio app:

[UIView beginAnimations:nil context:NULL]; 
[UIView setAnimationDuration:1]; 
[UIView setAnimationTransition:UIViewAnimationTransitionFlipFromLeft forView:imgView cache:YES]; 
    imgView.image = img2; 
[UIView commitAnimations]; 

Ma l'uso di questo metodo è sconsigliato in iOS 4.0 e versioni successive, e dovrei usare transitionWithView:duration:options:animations:completion:

Non riesco a farlo funzionare correttamente. Qualcuno può aiutarmi? Thx!

Answer 1

[UIView transitionWithView:imgView // use the forView: argument 
        duration:1   // use the setAnimationDuration: argument 
        options:UIViewAnimationOptionTransitionFlipFromLeft 
          // check UIViewAnimationOptions for what options you can use 
       animations:^{   // put the animation block here 
           imgView.image = img2; 
          } 
       completion:NULL];  // nothing to do after animation ends. 

Answer 2

ho fatto questa funzione in base al codice:

- (void)flipCurrentView:(UIView*)oldView withNewView:(UIView*)newView reverse:(BOOL)reverse 
{ 
    newView.alpha = 0; 
    [UIView transitionWithView:newView 
         duration:1  
         options:UIViewAnimationOptionTransitionFlipFromLeft 
        animations:^{   
         oldView.alpha = 0; 
         newView.alpha = 1; 
        } 
        completion:^(BOOL finished){ 
         if(reverse){ 
          [self flipCurrentView:newView withNewView:oldView reverse:NO]; 
         } 
         finished = YES; 
        }]; 
}