Random Picker Using UIScrollView with SpriteKit

Question

During scrolling, I experience a trick / lag.

It only appears on the iPhone 5 och very rarely on the iPhone 5s. It appears only when you hold your finger, and not while slowing down the scroll. It seems very random, but as soon as it starts to lag, it always continues for some time.

This can be caused by jumping to the main screen and back again several times (sometimes it works for a while, and sometimes the ledges appear all the time). This happens, as I said, in a very random way. If you try this sample project and don’t see any students, be patient and try some more.

The sample project is based on the SpriteKit game template, and I tried to make as few changes as possible to make debugging easier.

Project Example: https://github.com/bobmoff/ScrollStudderingExample

I communicate with Apple support about this, but so far they only mentioned that they will send it to the technical specialists who work on SpriteKit and will return to me.

I struggled with this problem, perhaps in a year, therefore, if someone comes up with a real solution to why this is happening, I will cry with happiness.

Answer 1

This is just an idea: did you try to untie the method scrollViewDidScrollfrom the animation? (Similar to "debouncing" scroll events in Javacript.)

, , , , ...

:

-:

CGPoint globalVar;

ViewController:

- (void)scrollViewDidScroll:(UIScrollView *)scrollView {

    globalVar = scrollView.contentOffset;
}

SKScene:

-(void)update:(CFTimeInterval)currentTime {

     spriteToScroll.position = globalVar;
}