core-animation

I want to create soft animation between transitions in simply UI: view that moved When a call scrollToPoint: for move view to point that transition doesn't animate. I'm newbe in Cocoa programming (iOS is my background). And I don't know how right use .animator or NSAnimationContext. Also I was read Core Animation guide but didn't find the solution. The source can be reach on Git Hub repository Please help !!! scrollToPoint is not animatable. Only animatable properties like bounds and position in NSAnimatablePropertyContainer are animated. You don't need to do anything with CALayer: remove the

My object a sub class of NSObject has CALayer instance variable. I use it for drawing and caching content with its delegate set to my object. But for some reason drawLayer:inContext: method NEVER gets called. Whereas actionForLayer:forKey: delegate method does get called implying the delegate is getting set properly with layer.delegate = self in the object's init method. Any suggestions on what is preventing my layer drawing method drawLayer:inContext: from getting called ? I am called the [layer setNeedDisplay] often. So I guess it is some fundamental error. drawLayer:inContext: won't get

Here's sample code: //Called by VC: HICircleView *circleView = [[HICircleView alloc] initWithFrame:CGRectMake(0, 0, 100, 100)]; // init of circle view - (id)initWithFrame:(CGRect)frame { self = [super initWithFrame:frame]; if (self) { CAShapeLayer *borderLayer = [CAShapeLayer layer]; borderLayer.fillColor = [UIColor whiteColor].CGColor; borderLayer.path = [UIBezierPath bezierPathWithOvalInRect:self.frame].CGPath; borderLayer.strokeColor = [[UIColor redColor] CGColor]; borderLayer.lineWidth = 5; [self.layer addSublayer:borderLayer]; } return self; } OK, thanks for the answer. to shift i: CGRect

I'm trying to set a gradient background on a view, but my code below makes the UIView appear solid black. If i change the whiteColor to greenColor, the gradient is displayed properly. Changing the backgroundColor of the layer to greenColor makes the view appear solid green. My guess is that i'm dealing with some kind of transparency-issue, but i can't figure to work around it. CAGradientLayer *gradientLayer = [CAGradientLayer layer]; gradientLayer.colors = [NSArray arrayWithObjects: (id)[[UIColor whiteColor] CGColor], (id)[[UIColor blackColor] CGColor], nil]; gradientLayer.frame = CGRectMake(0

I added an CAKeyframeAnimation with the Key "SpeedBoat" to a CALayer. Now I am trying to change the speed of the animation during the animation. [[self.shipLayer animationForKey:@"SpeedBoat"] setSpeed:([[self.shipLayer animationForKey:@"SpeedBoat"] speed] + deltaTime)]; There seems to be an error in this line. But I do not get any debug informations. What is wrong here? Is it possible to change the speed of an ongoing animation? It would be very nice if somebody could help me :) Best regards xen Max MacLeod Yes, you can definitely change the speed of an animation. That's because

I know how to implement the basic animation by moving/resizing a UIView. However, the following two animations seems a bit complicated. 1) Imagine a car game, where when you press on the pedal button the speedometer spins. How to do the kind of animation where the bar "fills up" in a circular shape? 2) The second animation is easier to describe. How to do the animation of numbers increasing where the number slides down and the new number appears from the top similar to a slot machine. For your first question, I would think that CGAffineTransform would be the way to go. Using this, I would

I'm flipping UIViews similar to the page flip of the Weather app. The views are not fullscreen, though, and the superview has rounded corners. The problem is that during the flip animation the rounded corners of the superview are filled out to the square corners with black. Here's how I'm setting the corners: self.view.layer.cornerRadius = 15.0f; self.view.clipsToBounds = YES; Here's how I'm flipping the views (both frontView and backView are retained): UIView *toView; UIView *fromView; UIViewAnimationOptions animationType; if (toFront) { toView = self.frontView; fromView = self.backView;