启用AR相机后，iPhone X手电筒将关闭 [英] iPhone X Flashlight turns off when AR Camera is enabled

问题描述

我正在构建一个AR应用程序，该应用程序需要打开手电筒才能打开手电筒模式.打开手电筒模式，然后启用AR场景在我的iPhone 8上工作正常，但是在iPhone X上，手电筒先打开然后再关闭.有什么办法可以解决此问题，或者我需要做一些特定的工作才能使iPhone X工作?

I am building an AR app that needs the flashlight to be turned on torch mode. Turning on torch mode and then enabling the AR scene works fine on my iPhone 8, but on the iPhone X, it the flashlight turns on and then off again. Is there some way around this, or something specific I have to do for the iPhone X to work?

- (void)turnTorchOn:(bool) on {
    Class captureDeviceClass = NSClassFromString(@"AVCaptureDevice");
    if (captureDeviceClass != nil) {
        AVCaptureDevice *device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
        if ([device hasTorch]){

            [device lockForConfiguration:nil];
            if (on) {
                [device setTorchMode:AVCaptureTorchModeOn];
            } else {
                [device setTorchMode:AVCaptureTorchModeOff];
            }
            [device unlockForConfiguration];
        }
    }
}

再后来:

self.arConfig = [ARWorldTrackingConfiguration new];
self.arConfig.planeDetection = ARPlaneDetectionHorizontal;
self.sceneView = [[ARSCNView alloc] initWithFrame:self.view.frame];
[self.view addSubview:self.sceneView];

SCNScene *scene = [SCNScene new];
self.sceneView.scene = scene;
self.sceneView.autoenablesDefaultLighting = YES;
self.sceneView.delegate = self;
self.sceneView.session.delegate = self;

更具体地说，此行关闭手电筒:

More specifically, this line turns off the flashlight:

self.sceneView = [[ARSCNView alloc] initWithFrame:self.view.frame];

推荐答案

我希望用Swift编写的逻辑稍有不同的代码(由于guard语句)可以在您的iPhone X上使用，但是说实话，我还没有还没有尝试过.

I hope this code written in Swift with a slightly different logic (due to guard statement) may work for your iPhone X but, honestly saying, I haven't tried it yet.

func toggleTorch(on: Bool) {

    guard let device = AVCaptureDevice.default(for: AVMediaType.video) else { 
        return 
    }
    if device.hasTorch {
        do {
            try device.lockForConfiguration()

            if on == true {
                device.torchMode = .on
            } else {
                device.torchMode = .off
            }

            device.unlockForConfiguration()

        } catch {
            print("Error. Torch couldn't be used")
        }
    } else {
        print("Torch isn't available")
    }
}

// CALL IT:

// toggleTorch(on: true)
// toggleTorch(on: false)

希望这会有所帮助.

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