core-animation

问题 To illustrate this question, I gisted a very small Xcode project on Github (two classes, 11kb download). Have a look at the gist here or use git clone git@gist.github.com:93982af3b65d2151672e.git . Please consider the following scenario. A custom view of mine, called 'container view', contains two little squares. Illustrated in this screenshot: The blue square is a 22x22 pt UIView instance and the red square is a 22x22 pt CALayer instance. For purposes of this question I want the two squares

问题 I have a UITableView that I am attempting to expand and collapse using its beginUpdates and endUpdates methods and have a drop shadow displayed as that's happening. In my custom UITableViewCell, I have a layer which I create a shadow for in layoutSubviews : self.shadowLayer.shadowColor = self.shadowColor.CGColor; self.shadowLayer.shadowOffset = CGSizeMake(self.shadowOffsetWidth, self.shadowOffsetHeight); self.shadowLayer.shadowOpacity = self.shadowOpacity; self.shadowLayer.masksToBounds = NO;

问题 I have a UITableView that I am attempting to expand and collapse using its beginUpdates and endUpdates methods and have a drop shadow displayed as that's happening. In my custom UITableViewCell, I have a layer which I create a shadow for in layoutSubviews : self.shadowLayer.shadowColor = self.shadowColor.CGColor; self.shadowLayer.shadowOffset = CGSizeMake(self.shadowOffsetWidth, self.shadowOffsetHeight); self.shadowLayer.shadowOpacity = self.shadowOpacity; self.shadowLayer.masksToBounds = NO;

问题 Trying to animatie an ellipse masked on a UIView to be scale transformed remaining in the center position. I have found CALayer - CABasicAnimation not scaling around center/anchorPoint, and followed by adding a bounds property to the maskLayer CAShapeLayer however, this ends with the mask being positioned in the left corner with only 1/4 of it showing. I would like the mask to remain within the center of the screen. @synthesize maskedView; - (void)viewDidLoad { [super viewDidLoad];

问题 I have a UIView with a shadow and a UIImageView subview. I want to resize the view when the iPad is rotated and I'm trying to do this in the willRotateToInterfaceOrientation callback. If I set the shadow on the UIView in the basic way the rotation is very choppy; so I'd like some suggestions from others on how to set the shadow setting layer.shadowPath. I have tried animating the frame size change using [UIView animateWithDuration:animations] and setting the new shadowPath in the same block,

问题 EDIT : i've refactored the question a bit and solved part of the issue, now the question comes down to why does the presentation layer glitches/flashes when the animation is resumed. At this point tho i'm accepting any answer that makes the animation resume both forwards and backwards at will with no issue. I'm not sure the approach i'm using is the right one, i'm still pretty new to Swift. Note : Sample project at the bottom, for having a better understanding of the issue. In my project i'm

问题 Referring to this post, i'm trying to adapt the animations to landscape mode. Basically what i want is to rotate all layers of -90° (90° clockwise) and the animations to run horizontally instead of vertically. The author didn't bother to explain the logic under the hood, there are a dozen paper folding libraries in obj-c which are all based on the same architecture, so apparently this is the way to go for folding. EDIT : To further clarify what i want to achieve, here you can look at three

问题 I am using a CADisplayLink to do a view animation that just interpolates a value and redraws the view itself. e.g. I have a view MyView and it has a property value , whenever value is set I call setNeedsDisplay and the view knows what to draw. to animate this I use CADisplayLink and I want the view to 'morph' between values. I do this by just interpolating the value from the animation's start and stop Value: - (CGFloat)interpolatedValue:(CGFloat)sourceValue withValue:(CGFloat)targetValue

来源： https://stackoverflow.com/questions/33631538/avvideocompositioncoreanimationtool-export-performance-with-lots-of-sublayers-an

来源： https://stackoverflow.com/questions/33631538/avvideocompositioncoreanimationtool-export-performance-with-lots-of-sublayers-an