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Questions tagged [cadisplaylink]

A CADisplayLink object is a timer object that allows your application to synchronize its drawing to the refresh rate of the display.

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Slow down CADisplayLink interval

I was using NSTimer for my iOS application but I wasn't getting the result I wanted because of SetNeedsDisplay. I made some research and found the CADisplayLink which is giving me the result I want about the animation. Sadly I can't manage to put a…
Bryan ORTIZ
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How can I track screen renderer

How can I move object as function of time in React-Native? In native iOS I do it like this: CADisplayLink *link = [CADisplayLink displayLinkWithTarget:self selector:@selector(tick:)]; [link addToRunLoop:[NSRunLoop mainRunLoop]…
gran33
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Synchronizing CADisplayLink changes to an in progress CAAnimation

I'm trying to combine CADisplayLink and CAAnimation so that I can animate some layers with CAAnimation, and adjust others in realtime based on the changing presentation layer of the animated layers. I realize that CAAnimations are being driven…
gcs
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How to set desired render frequency (FPS) in an iOS application?

I'm using CADisplayLink on an iOS app with a renderOneFrame method/handler. My understanding is this is triggered every screen refresh, i.e. 60Hz. However my app is struggling to run at 60FPS and with more features to add, I worry that on older…
Mr. Boy
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Frame rate compromised with CADisplayLink and drawRect

My question is about iOS development. I am writing a simple game in order to test the low level Core Graphics functions (contexts, layers, etc) and how to mix it with actual simple views... I explain it: I have a simple sprite in the screen, it is…
Ayoze Roberto Bernardo
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CADisplayLink at iOS 6.0 not retaining target

I have a such code: NSInvocation* invocation = [NSInvocation invocationWithMethodSignature:[self methodSignatureForSelector:@selector(updateFrame)]]; [invocation setTarget:self]; [invocation setSelector:@selector(updateFrame)]; displayLink_ =…
Siarhei Fedartsou
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crash with AVCapture based viewController

I m working on an app which use OpenGL VideoCapture inside a UIViewController on the first init of this controller I get this message in the console: wait_fences: failed to receive reply: 10004003 the message is displayed right after viewController…
Nico AD
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CADisplayLink with NSRunLoopCommonModes not executed for every frame when tracking UIScrollView?

I am trying to execute a small piece of code on every single frame in a regular (non-OpenGL) iPhone app. The goal is to have a frame counter so that I can measure (rather than guess) where the slow points in the app are and fix them to create a…
Daniel Wagner
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Can someone explain to me how scheduling works between a main thread and an NSThread?

For example is it doing something like SCHED_FIFO or SCHED_RR from pthreads? Can the scheduling policy be changed? Can priorities be assigned to the main thread and an NSThread? Ultimately I would like the main thread to run at 30 Hz with a…
Xavier
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CADisplayLink accuracy issues with OpenGL ES on iOS

My iOS game is currently using CADisplayLink for timing of OpenGL rendering operations. I've got a GCD dispatch queue running on a second thread that issues all the OpenGL rendering and state calls to the GPU. Everything works fine, except the…
Stu
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CADisplayLink in RunLoop not calling callback

I have the following code which should make drawFrame be called every frame but it doesn't: - (void)viewDidLoad { [super viewDidLoad]; displayLink = [viewReference.window.screen displayLinkWithTarget:(self) selector:@selector(drawFrame)]; …
Lars
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iOS: The grey screen between Default.png and the first OpenGL ES frame

I'm trying to port my previous openGL iPhone app to use Xcode's new OpenGL ES template, which uses CADisplayLink. WHat I've noticed is that after Default.png is displayed, and before the first frame is drawn, there is a grey screen in between that…
kamziro
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How to animate a view in a circular motion using its real-time position coordinates?

I'm currently working on a SwiftUI project, and in order to detect intersections/collisions, I need real-time coordinates, which SwiftUI animations cannot offer. After doing some research, I came across a wonderful question by Kike regarding how to…
PGCodes
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how to replace NSTimer with CADisplayLink?

I call a doPoof method using NSTimer as following: [NSTimer scheduledTimerWithTimeInterval:0.2 target:self selector:@selector(doPoof:) userInfo:myCALayer repeats:FALSE]; How to replace the above using CADisplayLink instead of an NSTimer?
PrimeSeventyThree
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Is CADisplayLink callback always runs on the main thread?

I couldn't find any direct answer online nor within the docs about this. If I'm setting up CADisplayLink with the following: let displayLink = CADisplayLink(target: self, selector: #selector(updateShimmer)) displayLink.add(to: .current, forMode:…
Roi Mulia
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