Core Animation not working when not root View Controller

Question

I have some Core Animation code that works perfectly on a root View Controller (VC1), but when I change the root to another View Controller (VC2) that segues to VC1, the animations on VC1 never runs, even though its animation methods are called. Interestingly, if I turn off animate on the segue, the core animation on VC1 works.

This is my implementation of VC1:

CAShapeLayer* circleLayer;

- (void)setupCircle
{
    CGPathRef circlePath = CGPathCreateWithEllipseInRect(CGRectMake(10, 40, 100, 100), nil);
    circleLayer = [CAShapeLayer layer];
    circleLayer.path = circlePath;
    circleLayer.fillColor = [UIColor orangeColor].CGColor;
    circleLayer.strokeColor = [UIColor blueColor].CGColor;
    circleLayer.lineWidth = 10;
    [self.view.layer addSublayer:circleLayer];
}

- (void)animateCircle
{
    CABasicAnimation* circleAnimation = [CABasicAnimation animationWithKeyPath:@"strokeEnd"];
    circleAnimation.duration = 4;
    circleAnimation.fromValue = @0;
    circleAnimation.toValue = @1;
    [circleLayer addAnimation:circleAnimation forKey:@"circleAnimation"];
}

- (void)viewDidLoad
{
    [super viewDidLoad];
    [self setupCircle];
    [self animateCircle];
}

What is the problem? Thanks.

Try calling [self setupCircle] and [self animateCircle] in ViewDidAppear instead of ViewDidLoad — rbs
– rbs, Commented Aug 8, 2014 at 6:39

Kumar KL · Accepted Answer · 2014-08-08 06:38:50Z

1

but when I change the root to another View Controller (VC2) that segues to VC1

The problem in your cycle is viewDidLoad, it doesn't get called if you back from the Child VC.

Put the stuff in the viewWillAppear OR viewDidAppear

answered Aug 8, 2014 at 6:38

Kumar KL

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Amir iDev · Accepted Answer · 2014-08-08 06:49:11Z

0

You can try this code;

[self performSelector:@"setupCircle" withObject:nil afterDelay:0.1];
[self performSelector:@"animateCircle" withObject:nil afterDelay:0.1];

answered Aug 8, 2014 at 6:49

Amir iDev

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