Delay between animations on a UIImageView in iOS

Question

I have an animation which is made up of an array of images, on which I then run

[myUIImageView startAnimating]

I want the animation to run once, then stop for 3 seconds, then repeat.

I need to run this animation in a separate thread so I have

NSThread *animationThread = [[NSThread alloc] initWithTarget:self selector:@selector(startAnimTask) withObject:nil waitUntilDone:NO]; 
[animationThread start];

in my viewDidLoad, and then

-(void) startAnimTask {

   //create array of images here; animationDuration (3) and animationRepeatCount (1)
   [self setUpAnimation];

   while (true){
       [myUIImageView startAnimating];
       usleep(3);        
       [myUIImageView stopAnimating];
       usleep(3);    
   }
}

Using this method, I receive a memory warning. I've also tried running the start and stop on the MainThread with no luck.

Any ideas?

score 5 · Accepted Answer · answered Aug 30 '12 at 11:34

5

Do this:

 [myUIImageView startAnimating];
 [self performSelector:@selector(startAnimTask) 
         withObject:nil 
         afterDelay:(myUIImageView.animationDuration+3.0)];

Now selector is:

 -(void)startAnimTask
 {
   [myUIImageView startAnimating];
   //repeat again then add above selector code line here
 }

answered Aug 30 '12 at 11:34

Paresh Navadiya

37,791
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1

Should this not be performSelectorOnMainThread? It doesn't seem to work with just performSelector – MSpeed Aug 30 '12 at 11:39
what //repeat again then refer for? – Harish May 14 '13 at 11:28

score 1 · Answer 2 · answered Aug 30 '12 at 11:25

1

UI is not thread safe, so UI calls should be executed only in main thread, maybe this is the case.

answered Aug 30 '12 at 11:25

MANIAK_dobrii

5,945
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score 1 · Answer 3 · answered Aug 30 '12 at 11:32

I think you can go with this:

  [self performSelector:@selector(startAnimTask) 
             withObject:nil 
             afterDelay:0.1];

  [self performSelector:@selector(startAnimTask) 
             withObject:nil 
             afterDelay:3.0];

In startAnimTask method write your animation logic code.

Enjoy Coding :)

score 1 · Answer 4 · edited Aug 30 '12 at 11:58

1

Try this approach to complete your task:

[self performSelector:@selector(myTask) 
             withObject:nil 
             afterDelay:3.0];

-(void)myTask{

//Write your logic for animation

}

edited Aug 30 '12 at 11:58

Mick MacCallum

126,953
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answered Aug 30 '12 at 11:45

ASP

78
5

that's what i said u have anything differnet – Paresh Navadiya Aug 30 '12 at 11:49

Delay between animations on a UIImageView in iOS

4 Answers4