c++ - 从后台进入后iOS Vuforia错误
<p><p>我在我的 iOS 应用程序中使用 Vuforia SDK，版本 6.2.9。
一切正常，但应用从后台进入时出现错误。</p>
<p>运行 VUFORIA 的 ViewController 正在监听 <strong>UIApplicationWillResignActiveNotification</strong> 和 <strong>UIApplicationDidBecomeActiveNotification</strong> 通知。
在 UIApplicationWillResignActiveNotification 暂停 AR 的情况下，在 UIApplicationDidBecomeActiveNotification 的情况下恢复 AR。</p>
<pre><code>// we use the iOS notification to pause/resume the AR when the application goes (or come back from) background
[
addObserver:self
selector:@selector(pauseAR)
name:UIApplicationWillResignActiveNotification
object:nil];
[
addObserver:self
selector:@selector(resumeAR)
name:UIApplicationDidBecomeActiveNotification
object:nil];
</code></pre>
<p>这些是方法</p>
<pre><code>- (void) pauseAR {
NSError * error = nil;
if (!) {
NSLog(@"Error pausing AR:%@", );
}
}
- (void) resumeAR {
NSError * error = nil;
if(! ) {
NSLog(@"Error resuming AR:%@", );
}
// on resume, we reset the flash
Vuforia::CameraDevice::getInstance().setFlashTorchMode(false);
;
}
</code></pre>
<p>当我返回扫描模式时，应用程序从后台进入后，相机被卡住，出现错误
<strong>找不到响应选择器 renderFrameVuforia 的带有 CAEAGLLayer 或 CAMetalLayer 层类的 UIView</strong></p>
<pre><code>2017-07-17 11:13:01.187406+0200 App frame: {{0, 0}, {375, 667}}
2017-07-17 11:13:01.243707+0200 App 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 Vuforia Library version 6.2.9
2017-07-17 11:13:01.731099+0200 App AR View: Rotating to Portrait
2017-07-17 11:13:01.731406+0200 App frame: {{0, 0}, {375, 667}}
2017-07-17 11:13:01.731562+0200 App VideoBackgroundConfig: size: 750,1334
2017-07-17 11:13:01.731589+0200 App VideoMode:w=1280 h=720
2017-07-17 11:13:01.731611+0200 App width=750.000 height=1334.000
2017-07-17 11:13:01.731638+0200 App ViewPort: X,Y: 0,0 Size X,Y:750,1334
2017-07-17 11:13:02.598959+0200 App INFO/AR(8689) 2017-07-18 11:13:02: Completed CloudReco transaction with ID '6f5c61ecc07741a7b652242abf909479'
2017-07-17 11:13:02.843834+0200 App frame: {{0, 0}, {375, 667}}
2017-07-17 11:13:02.844215+0200 App frame: {{0, 0}, {375, 667}}
2017-07-17 11:13:02.860971+0200 App DEBUG/AR(8689) UIView has CAEAGLLayer layer class
2017-07-17 11:13:02.861114+0200 App DEBUG/AR(8689) UIView does not respond to selector renderFrameVuforia
2017-07-17 11:13:02.861191+0200 App DEBUG/AR(8689) UIView has CAEAGLLayer layer class
2017-07-17 11:13:02.861222+0200 App DEBUG/AR(8689) UIView does not respond to selector renderFrameVuforia
</code></pre>
<p>感谢您的帮助!</p></p>
<br><hr><h1><strong>Best Answer-推荐答案</ strong></h1><br>
<p><p>你在哪个方法中调用 <code>pauseAR()</code> ？</p>
<p>当我回到 ViewController(拥有 EAGLView)时，我遇到了同样的问题，相机被卡住了。 </p>
<p>我在 <code>viewWillDisappear()</code> 中调用 <code>pauseAR()</code> 并在 <code>viewWillAppear()</code> 中调用 <code>resumeAR()</code>，如问题出在 EAGLView 中的委托(delegate)方法 <code>renderFrameVuforia()</code> 从未被调用，我认为这是导致问题的原因:</p>
<blockquote>
<p>Could not find a UIView with CAEAGLLayer or CAMetalLayer layer class that responds to selector renderFrameVuforia</p>
</blockquote>
<p>于是我查阅了 Vuforia 开发者库，发现:</p>
<blockquote>
<p>The app's view hierarchy is set up completely before calling QCAR::onResume() (at which point QCAR attempts to locate the app's view conforming to UIGLViewProtocol).</p>
</blockquote>
<p>我将调用位置的<code>resumeAR()</code>方法更改为<code>viewDidAppear()</code>，一切正常。希望对您有所帮助。</p></p>
<p style="font-size: 20px;">关于c++ - 从后台进入后iOS Vuforia错误，我们在Stack Overflow上找到一个类似的问题：
<a href="https://stackoverflow.com/questions/45140805/" rel="noreferrer noopener nofollow" style="color: red;">
https://stackoverflow.com/questions/45140805/
</a>
</p>
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