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POCABasicAnimation is not working when the method is called from the viewDidLoad
 

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  1. POCABasicAnimation is not working when the method is called from the viewDidLoad
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    <p>I have an imageView added to a view that's presented as a modalViewController, with style horizontal flip. I have added the following code for animating the imageView.</p> <pre><code>- (void)animateTheImageview:(UIImageView*) imageViewToAnimate{        CABasicAnimation *fadeAnimation;    fadeAnimation = [CABasicAnimation animationWithKeyPath:@"opacity"];    fadeAnimation.duration = 1.5;    fadeAnimation.repeatCount = INFINITY;    fadeAnimation.autoreverses = NO;    fadeAnimation.fromValue = [NSNumber numberWithFloat:1.0];    fadeAnimation.toValue = [NSNumber numberWithFloat:0.5];    fadeAnimation.removedOnCompletion = YES;    fadeAnimation.fillMode = kCAFillModeForwards;    [imageViewToAnimate.layer addAnimation:fadeAnimation forKey:@"animateOpacity"]; } - (void)switchOnorOff {        if (onOffSwitch.on) {                self.lightImage.image = [UIImage imageNamed:@"CFLGlow.jpg"];        [self animateTheImageview:self.lightImage];    }    else {                self.lightImage.image = [UIImage imageNamed:@"CFL-BULB.jpg"];        [self.lightImage.layer removeAllAnimations];    } } </code></pre> <p>And I'm calling this method from the <code>viewDidLoad</code>:</p> <pre><code>- (void)viewDidLoad { [self switchOnorOff]; } </code></pre> <p>My issue is the above code doesn't animate the imageView.</p> <p>But when I tried the below code it works:</p> <pre><code>[self performSelectorOnMainThread:@selector(animateTheImageview:) withObject:self.lightImage waitUntilDone:YES]; </code></pre> <p>My question is why this issue is happening ? Is there any difference between,</p> <p><code>[self performSelectorOnMainThread:@selector(animateTheImageview:) withObject:self.lightImage waitUntilDone:YES];</code></p> <p>and </p> <p><code>[self animateTheImageview:self.lightImage];</code></p>
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