2014/10/15 下午 10:12:51

iphone Programming Glossary: presentationlayer

How to find whether two objects intersect each other?

http://stackoverflow.com/questions/11642947/how-to-find-whether-two-objects-intersect-each-other

They are intersecting It that didn't work for testing for intersections while currently animating try using the presentationLayer property of the view's layer. Here's what the presentationLayer is taken from the CALayer Class Reference presentationLayer.. intersections while currently animating try using the presentationLayer property of the view's layer. Here's what the presentationLayer is taken from the CALayer Class Reference presentationLayer Returns a copy of the layer containing all properties as they.. property of the view's layer. Here's what the presentationLayer is taken from the CALayer Class Reference presentationLayer Returns a copy of the layer containing all properties as they were at the start of the current transaction with any active..

Key value Observing during UIView Animations

http://stackoverflow.com/questions/1555690/key-value-observing-during-uiview-animations

by accessing its presentation layer. This can be done using code like the following CGPoint currentCenter view.layer presentationLayer center Unfortunately the presentation layer's properties are not KVO compliant so the best way I can think of for tracking..

How to Check if Parallax is enabled

http://stackoverflow.com/questions/20361033/how-to-check-if-parallax-is-enabled

beginCheckingPresentationPosition set the base position and do the first check in 0.5 seconds _basePosition self layer presentationLayer position self performSelector @selector checkPresentationPosition withObject nil afterDelay 0.5 void checkPresentationPosition.. @selector checkPresentationPosition withObject nil afterDelay 0.5 void checkPresentationPosition quick note on presentationLayer The property supplied to UIInterpolatingMotionEffect must be animatable. So we can't just create our own. UIKit will then.. itself will act as if in a perpetual animation so its properties won't directly be affected. We'll have to query the presentationLayer. and that's also why we're pulling rather than using KVO or a suitable subclass to push CGPoint newPosition self layer presentationLayer..

AVCaptureVideoPreviewLayer: taking a snapshot

http://stackoverflow.com/questions/3397899/avcapturevideopreviewlayer-taking-a-snapshot

a UIImage. But it all produces clear or white images. I tried accessing the layer the view's layer the superlayer the presentationLayer the modelLayer but to no avail. I guess the data in AVCaptureVideoPreviewLayer is very internal and not really part of the..

How can I callback as a CABasicAnimation is animating?

http://stackoverflow.com/questions/3493992/how-can-i-callback-as-a-cabasicanimation-is-animating

you can start a function that will be polling current view position using a timer I suppose you will need to get presentationLayer from view's layer and get position values from it . There's no callbacks for CAAnimation other than animationDidStart and..

Core Animation, unexpected animated position and hitTest values

http://stackoverflow.com/questions/7962335/core-animation-unexpected-animated-position-and-hittest-values

Animation unexpected animated position and hitTest values When I use CALayer hitLayer self.view.window.layer presentationLayer hitTest pointOfTouch I then explore the layer to discover that all the property that are animating at the moment are set.. iOS 4.3. I also have an IBOutlet to that UIImage view. So I did the same test like this CALayer l self.topLeft.layer presentationLayer NSLog @ presentation layer frame for eloise is @ self cgRectDescription l.frame NSLog @ and xPosition .2f yPosition .2f..

How to know the current position of circle while it is rotating on custom route path?

http://stackoverflow.com/questions/8192018/how-to-know-the-current-position-of-circle-while-it-is-rotating-on-custom-route

@ moveTheSquare circleView release iphone objective c share improve this question CALayer provides a method presentationLayer which returns a layer with the current animation state applied. So long as you have the layer being animated you can inspect..

how to to make gesturerecognizer working in an animating UIImage view

http://stackoverflow.com/questions/8340329/how-to-to-make-gesturerecognizer-working-in-an-animating-uiimage-view

of the sprite UIImageView in your case by animation is not applied to the sprite original it is applied to its .layer.presentationLayer the real one is still at its original place. In this case you can try this Put your gesture on the whole screen when response.. Put your gesture on the whole screen when response comes from event you check the touch point make a hitTest to the presentationLayer if yes then do what you want. I usually use below code to do that. BOOL areYouThere CGPoint point return CALayer sprite.layer.presentationLayer.. then do what you want. I usually use below code to do that. BOOL areYouThere CGPoint point return CALayer sprite.layer.presentationLayer hitTest point nil Get the touch point from a UITouch object when below method is invoked BOOL gestureRecognizer UIGestureRecognizer..

Is there a way to figure out, how many degrees an view is rotated currently during an animation?

http://stackoverflow.com/questions/877198/is-there-a-way-to-figure-out-how-many-degrees-an-view-is-rotated-currently-duri

this answer while trying to find the current rotation angle during a key frame animation CALayer layer self.layer presentationLayer float currentAngle layer valueForKeyPath @ transform.rotation.z floatValue Seems to work for me. Also nice and concise...