I can’t find it documented anywhere, but it appears the backgroundColor property of UILabel is not animatable, as your code works fine with a vanilla UIView. This hack appears to work, however, as long as you don’t set the background color of the label view itself: #import <QuartzCore/QuartzCore.h> … theLabel.layer.backgroundColor = [UIColor whiteColor].CGColor; [UIView animateWithDuration:2.0 … Read more
Recently appeared Apple’s technical note QA1673 describes how to pause/resume layer’s animation. Pause and resume animations listing is below: -(void)pauseLayer:(CALayer*)layer { CFTimeInterval pausedTime = [layer convertTime:CACurrentMediaTime() fromLayer:nil]; layer.speed = 0.0; layer.timeOffset = pausedTime; } -(void)resumeLayer:(CALayer*)layer { CFTimeInterval pausedTime = [layer timeOffset]; layer.speed = 1.0; layer.timeOffset = 0.0; layer.beginTime = 0.0; CFTimeInterval timeSincePause = [layer convertTime:CACurrentMediaTime() … Read more
What you really should do is to animate the stroke of a CAShapeLayer where the path is a circle. This will be accelerated using Core Animation and is less messy then to draw part of a circle in -drawRect:. The code below will create a circle shape layer in the center of the screen and … Read more
From the UIView reference‘s section about the beginAnimations:context: method: Use of this method is discouraged in iPhone OS 4.0 and later. You should use the block-based animation methods instead. Eg of Block-based Animation based on Tom’s Comment [UIView transitionWithView:mysuperview duration:0.75 options:UIViewAnimationTransitionFlipFromRight animations:^{ [myview removeFromSuperview]; } completion:nil];
Swift 5 In my case, when I set button.alpha = 0, the button interaction stops working, no matter if I setup UIViewAnimationOptionAllowUserInteraction as an option. Reason Whenever you define the animation or not, the view’s property is applying to view’s layer immediately. Because of this, when you set the view.alpha=0, you hide the view completely. … Read more
To expand upon what Nikolai said, the best way to handle this is to use Core Animation to animate the motion of the image or view along a Bezier path. This is accomplished using a CAKeyframeAnimation. For example, I’ve used the following code to animate an image of a view into an icon to indicate … Read more
Use: #import <QuartzCore/QuartzCore.h> ……. [myView.layer removeAllAnimations];
Found a method (I modified it a bit) that worked perfectly for me: iphone UIImageView rotation #import <QuartzCore/QuartzCore.h> – (void) runSpinAnimationOnView:(UIView*)view duration:(CGFloat)duration rotations:(CGFloat)rotations repeat:(float)repeat { CABasicAnimation* rotationAnimation; rotationAnimation = [CABasicAnimation animationWithKeyPath:@”transform.rotation.z”]; rotationAnimation.toValue = [NSNumber numberWithFloat: M_PI * 2.0 /* full rotation*/ * rotations * duration ]; rotationAnimation.duration = duration; rotationAnimation.cumulative = YES; rotationAnimation.repeatCount = repeat … Read more
As Ben said, you’ll need to work with the UIView’s layer, using a CATransform3D to perform the layer’s rotation. The trick to get perspective working, as described here, is to directly access one of the matrix cells of the CATransform3D (m34). Matrix math has never been my thing, so I can’t explain exactly why this … Read more