UIImageView animateImages Delay

I'm kind of stuck with this problem. I have a UIImageView animation with 37 images where I show a glass filling with alcohol. I initialize my image array in ViewDidLoad,

NSArray * GlassAnim  = [[NSArray alloc] initWithObjects:
                        [UIImage imageWithContentsOfFile:
[[NSBundle mainBundle] pathForResource:@"SodaPour1" ofType:@"png"]],
                        [UIImage imageWithContentsOfFile:
[[NSBundle mainBundle] pathForResource:@"SodaPour39" ofType:@"png"]],
     开发者_JAVA技巧                   nil];

imgGlass.animationImages = GlassAnim;
imgGlass.animationDuration = 2.5;
imgGlass.contentMode = UIViewContentModeScaleAspectFit;
imgGlass.animationRepeatCount=1;
[GlassAnim release];

Then I call startAnimating when user taps the screen. But the problem is that the animation has a half a second delay for the first time. Each image has a dimension of 330*372 pixels and the file size is 180KB png files. Is there a better way to do this other than playing a video?.

Thanks.

---

Here you go,

1. You start a Timer to change image names.

   timerAnimation = [[NSTimer scheduledTimerWithTimeInterval:0.10 target:self
   selector:@selector(changeImagesAccordingly) userInfo:nil repeats:YES] 
   retain];
   

2. Rename the images in a sequence. I have 16 images.

   Eg:- "AnimationImg1.png", "AnimationImg2.png", "AnimationImg3.png"

   - (void)changeImagesAccordingly {
       if (iImgAnim<16) {
           imgView.image = [UIImage imageWithContentsOfFile:[[NSBundle mainBundle]
                  pathForResource:[NSString stringWithFormat:@"AnimationImg%d",iImgAnim] ofType:@"png"]];
           iImgAnim++;
       } else {
           [timerAnimation invalidate];
           iImgAnim=1;
       }
   }
   

That should do it :)