从后台进入后出现iOS Vuforia错误

iOS Vuforia error after entering from background

本文关键字:iOS Vuforia 错误 后台      更新时间:2023-10-16

我在iOS应用程序中使用Vuforia SDK,版本6.2.9。 所有工作都很好,但是当应用程序从后台进入时会出现错误。

运行 VUFORIA 的视图控制器正在侦听 UIApplicationWillResignActiveNotification 和UIApplicationDidBecomeActiveNotification通知。在UIApplicationWillResignActiveNotification的情况下暂停AR,在UIApplicationDidBecomeActiveNotification 恢复AR的情况下。

// we use the iOS notification to pause/resume the AR when the application goes (or come back from) background
[[NSNotificationCenter defaultCenter]
addObserver:self
selector:@selector(pauseAR)
name:UIApplicationWillResignActiveNotification
object:nil];
[[NSNotificationCenter defaultCenter]
addObserver:self
selector:@selector(resumeAR)
name:UIApplicationDidBecomeActiveNotification
object:nil];

这些是方法

- (void) pauseAR {
NSError * error = nil;
if (![vapp pauseAR:&error]) {
NSLog(@"Error pausing AR:%@", [error description]);
}
}
- (void) resumeAR {
NSError * error = nil;
if(! [vapp resumeAR:&error]) {
NSLog(@"Error resuming AR:%@", [error description]);
}
// on resume, we reset the flash
Vuforia::CameraDevice::getInstance().setFlashTorchMode(false);
[self handleRotation:self.interfaceOrientation];
}

当我返回扫描模式时,应用程序从后台进入后,相机冻结,并显示错误找不到具有 CAEAGLLayer 或 CAMetalLayer 类的 UIView 响应选择器 renderFrameVuforia

2017-07-17 11:13:01.187406+0200 App[8689:2961061] frame: {{0, 0}, {375, 667}}
2017-07-17 11:13:01.243707+0200 App[8689:2961061] DEBUG/AR(8689) Could not find a UIView with CAEAGLLayer or CAMetalLayer layer class that responds to selector renderFrameVuforia
2017-07-17 11:13:01.253958+0200 App[8689:2961061] Vuforia Library version 6.2.9
2017-07-17 11:13:01.731099+0200 App[8689:2961061] AR View: Rotating to Portrait
2017-07-17 11:13:01.731406+0200 App[8689:2961061] frame: {{0, 0}, {375, 667}}
2017-07-17 11:13:01.731562+0200 App[8689:2961061] VideoBackgroundConfig: size: 750,1334
2017-07-17 11:13:01.731589+0200 App[8689:2961061] VideoMode:w=1280 h=720
2017-07-17 11:13:01.731611+0200 App[8689:2961061] width=750.000 height=1334.000
2017-07-17 11:13:01.731638+0200 App[8689:2961061] ViewPort: X,Y: 0,0 Size X,Y:750,1334
2017-07-17 11:13:02.598959+0200 App[8689:2962160] INFO/AR(8689) 2017-07-18 11:13:02: Completed CloudReco transaction with ID '6f5c61ecc07741a7b652242abf909479'
2017-07-17 11:13:02.843834+0200 App[8689:2961061] frame: {{0, 0}, {375, 667}}
2017-07-17 11:13:02.844215+0200 App[8689:2961061] frame: {{0, 0}, {375, 667}}
2017-07-17 11:13:02.860971+0200 App[8689:2961061] DEBUG/AR(8689) UIView has CAEAGLLayer layer class
2017-07-17 11:13:02.861114+0200 App[8689:2961061] DEBUG/AR(8689) UIView does not respond to selector renderFrameVuforia
2017-07-17 11:13:02.861191+0200 App[8689:2961061] DEBUG/AR(8689) UIView has CAEAGLLayer layer class
2017-07-17 11:13:02.861222+0200 App[8689:2961061] DEBUG/AR(8689) UIView does not respond to selector renderFrameVuforia

感谢您的帮助!

你用哪种方法调用pauseAR()

当弹出回ViewController(拥有EAGLView(时,我遇到了同样的问题,相机被冻结了。

我在viewWillDisappear()中调用pauseAR(),在viewWillAppear()中调用resumeAR(),因为问题出现,EAGLView 中的委托方法renderFrameVuforia()从未被调用,我认为这是问题导致的问题:

找不到具有 CAEAGLLayer 或 CAMetalLayer 类的 UIView 响应选择器 renderFrameVuforia

所以我查找了 Vuforia 开发人员库并发现:

应用程序的视图层次结构是在调用 QCAR::onResume(( 之前完全设置的(此时 QCAR 会尝试找到符合 UIGLViewProtocol 的应用程序视图(。

我将resumeAR()称为位置的方法更改为viewDidAppear(),一切都像往常一样工作。希望这能帮助你。