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POiphone : remove CALayer when animation stop, CALayer flash before disappear
 

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  1. POiphone : remove CALayer when animation stop, CALayer flash before disappear
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    <ul> <li>create a simple project in XCode</li> <li>set view to receive multi-touch events</li> <li>respond in touchesBegan, create CALayer when detect touch event</li> <li>make a opacity fade out animation for CALayer</li> <li>when animation stop, remove CALayer from parent</li> </ul> <p>Expect: CALayer disappear normally</p> <p>Actual: CALayer flash (blink) before disappear</p> <p>full source code:</p> <pre><code>@implementation ViewController - (void)viewDidLoad { [super viewDidLoad]; // Do any additional setup after loading the view, typically from a nib. self.view.multipleTouchEnabled = YES; } - (void)viewDidUnload { [super viewDidUnload]; // Release any retained subviews of the main view. } - (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation { return (interfaceOrientation != UIInterfaceOrientationPortraitUpsideDown); } - (void) touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event { for (UITouch* touch in touches) { CGPoint p = [touch locationInView:self.view]; //NSLog(@"touch=%@ p=%@", touch, NSStringFromCGPoint(p)); CALayer *layer = [CALayer layer]; layer.position = p; layer.bounds = CGRectMake(0, 0, 70, 70); layer.cornerRadius = 30; layer.masksToBounds = NO; layer.backgroundColor = [UIColor colorWithRed:102.0/255.0 green:156.0/255.0 blue:255.0/255.0 alpha:0.8].CGColor; layer.shouldRasterize = YES; CABasicAnimation *fadeOutAnimation = [CABasicAnimation animationWithKeyPath:@"opacity"]; fadeOutAnimation.fromValue = [NSNumber numberWithFloat:1.0]; fadeOutAnimation.toValue = [NSNumber numberWithFloat:0.0]; fadeOutAnimation.duration = 0.5; fadeOutAnimation.delegate = self; fadeOutAnimation.removedOnCompletion = NO; [fadeOutAnimation setValue:layer forKey:@"parentLayer"]; [layer addAnimation:fadeOutAnimation forKey:@"opacity"]; [self.view.layer addSublayer:layer]; } } - (void)animationDidStop:(CAAnimation *)theAnimation finished:(BOOL)flag { if(flag) { CALayer *layer = [theAnimation valueForKey:@"parentLayer"]; if(layer) { layer.opaque = NO; layer.opacity = 0.0; //layer.hidden = YES; //NSLog(@"The layer object was: %@ (%@)", layer, [layer name]); [layer removeFromSuperlayer]; [layer removeAllAnimations]; } } } @end </code></pre>
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    1. USRui Fan
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    2. VO
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    3. VO
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    1. COwhat's your problem ?
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    2. CO+1 for "Expect: ... Actual: ..."
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      1. POiphone : remove CALayer when animation stop, CALayer flash before disappear
      1. USDavid Rönnqvist
 

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