即使设备的方向已锁定，也可以获取当前iOS设备的方向 [英] Get current iOS device orientation even if device's orientation locked

问题描述

即使设备的方向已锁定，我也要获取当前的iOS设备方向. (就像iOS相机应用一样)

I want to get the current iOS device orientation even if device's orientation is locked. (Just like iOS Camera app)

我想至少检测人像，左横向和右横向.

I want to detect Portrait, Landscape Left and Landscape Right at least.

锁定方向后，UIDeviceOrientation和UIInterfaceOrientation似乎不起作用.

UIDeviceOrientation and UIInterfaceOrientation do not seem to work when orientation is locked.

在这种情况下，我认为我们将使用CoreMotion.

In this case, I think that we will use CoreMotion.

我如何在swift4中对其进行逻辑处理?

How do i logic it in swift4?

推荐答案

使用核心运动声明运动管理器

    var orientationLast = UIInterfaceOrientation(rawValue: 0)!
    var motionManager: CMMotionManager?

运动管理器初始化

并在viewDidLoad中调用此函数

and call this function in viewDidLoad

    func initializeMotionManager() {
     motionManager = CMMotionManager()
     motionManager?.accelerometerUpdateInterval = 0.2
     motionManager?.gyroUpdateInterval = 0.2
     motionManager?.startAccelerometerUpdates(to: (OperationQueue.current)!, withHandler: {
        (accelerometerData, error) -> Void in
        if error == nil {
            self.outputAccelertionData((accelerometerData?.acceleration)!)
        }
        else {
            print("\(error!)")
        }
        })
     }   

要分析加速度计的仪表数据

 func outputAccelertionData(_ acceleration: CMAcceleration) {
    var orientationNew: UIInterfaceOrientation
    if acceleration.x >= 0.75 {
        orientationNew = .landscapeLeft
        print("landscapeLeft")
    }
    else if acceleration.x <= -0.75 {
        orientationNew = .landscapeRight
        print("landscapeRight")
    }
    else if acceleration.y <= -0.75 {
        orientationNew = .portrait
        print("portrait")

    }
    else if acceleration.y >= 0.75 {
        orientationNew = .portraitUpsideDown
        print("portraitUpsideDown")
    }
    else {
        // Consider same as last time
        return
    }

    if orientationNew == orientationLast {
        return
    }
    orientationLast = orientationNew
}

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