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
(Decided to take this out of comments and put it as an answer, since I think it’s a darned good answer 🙂 Ha! I had an NaN calculation (div0), too. Key debugging aid: the message in question is output by NSLog(), so set a breakpoint on NSLog() and watch what the OS is doing at … Read more
Just write your own method for the flip using Core Animation Transforms. – (void)verticalFlip{ [UIView animateWithDuration:someDuration delay:someDelay animations:^{ yourView.layer.transform = CATransform3DMakeRotation(M_PI,1.0,0.0,0.0); } completion:^{ // code to be executed when flip is completed }]; } Make sure you have the Core Animation libraries/frameworks added and included and also have included math.h if you want to use … Read more
I think that it’s easiest to explain what is happening for each of the three locations and then a “conclusion” at the end. I’m also adding some illustrations, showing exactly the behaviour that you are mentioning in your question so that it will be easier to follow for someone who hasn’t tried these three things … 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
Besides addSubview, there are other methods you can rely on to add your view: – insertSubview:aboveSubview: – insertSubview:belowSubview: – insertSubview:atIndex: You can control the index (actually z-index, or layer order) of the view using these methods.
Magenta overlays are caused by subpixel misalignment, while yellow overlays are caused by stretching. Prior to iOS 4, Instruments used magenta for both.
I have posted an example in my blog: CGPoint originalCenter = icon.center; [UIView animateWithDuration:2.0 animations:^{ CGPoint center = icon.center; center.y += 60; icon.center = center; } completion:^(BOOL finished){ [UIView animateWithDuration:2.0 animations:^{ icon.center = originalCenter; } completion:^(BOOL finished){ ; }]; }]; The above code will animate a UIImageView* (icon) in a 2-second animation. Once completed, another … 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
A UIView has a layer (CALayer). You can send animationKeys to it, which will give you an array of keys which identify the animations attached to the layer. I suppose that if there are any entries, the animation(s) are running. If you want to dig even deeper have a look at the CAMediaTiming protocol which … Read more