SpriteKit SKView 不再在场景之间转换 iOS 9

Question

We have a code base that was written and released in 2013, but in iOS 9 the app no longer transitions visibly between SKScene s when the presentScene:transition: message is sent to our SKView . The SKScene receives the didMoveToView: message but the scene itself never shows on screen.

Here's what we tried:

• Disabling Metal via the Info.plist
• Using [SKTransition transitionWithCIFilter:duration:] instead of the predefined animations
• Tweaking zPosition
• Switching to regular UIView animations (this made our SKNode s disappear)
• Making sure the transition method doesn't get called more than once
• Explicitly setting pausesOutgoingScene to YES on the SKTransition

None of the above attempts fixed the issue. Note that everything transitions properly in iOS 8

Here is some sample code that doesn't work:

-(BOOL)presentTitle {
    if (!titleSceneLoaded) {
        return NO;
    }
    [skView presentScene:titleScene transition:[SKTransition fadeWithDuration:1.0]];
    return YES;
}

Changing it to this makes it work again (without the transitions):

-(BOOL)presentTitle {
    if (!titleSceneLoaded) {
        return NO;
    }
    [skView presentScene:titleScene];
    return YES;
}

Any suggestions on how to locate/fix/workaround the bug?

Answer 1

There is a bug in iOS9 with presenting a scene with a transition in a subview.

I had the same issue and in my controller I was able to fix the issue by changing the following code in viewWillLayoutSubviews from this:

        [self.subview presentScene:self.scene];
        [self.view addSubview:self.subview];

to this:

        [((SKView *)self.view) presentScene:self.scene];

Another workaround if the scene has to remain in a subview approach is to use presentScene without the transition, which does work.

Answer 2

We were unable to get SKTransition to work. We talked to the developer support team, posted on the developer forums, and tried everything posted here.

It is SpriteKit bug exclusive to iOS 9. If anyone else runs into this bug on iOS 9, we switched to custom transitions utilizing UIView animateWithDuration:animations:completion: .

Answer 3

It is a bit late but my own wrestling with what seems to be this bug may be worth exploring.

As I found out, I had a UIViewController floating around without having being fully deallocated, which had an SKView on it.

The only side-effect from that SKView still being somewhat live was the presentScene(transition) not working, as you have experienced.

Answer 4

It will work if you drag and drop the SKView in the storyboard instead of creating it manually .

Then in the ViewController, create an outlet:

@IBOutlet var skView: SKView!

Then present the scene as:

homeScene = HomeScene(size: self.view.frame.size)
homeScene.scaleMode = .aspectFill
homeScene.backgroundColor = .clear
skView.presentScene(homeScene)

And from this SKScene, you can simply use the navigation with the transition as:

let gameScene = GameScene(size: self.size) 
self.view?.presentScene(gameScene, transition: SKTransition.doorsOpenHorizontal(withDuration: 1))