iOS 獲取攝像頭當前方向

在做二維碼掃描和直播獲取視頻流的過程中，可能會用到

AVCaptureDevice

AVCaptureVideoPreviewLayer

AVCaptureSession

這幾個參數，其中

1、定義顯示layer

var preview:AVCaptureVideoPreviewLayer! = nil

 

2、獲取攝像頭方向

self.preview = AVCaptureVideoPreviewLayer(session: self.session)
self.preview.videoGravity = AVLayerVideoGravityResizeAspectFill
self.preview.connection.videoOrientation = self.getDeviceDirection()

 

重點就是這里getDeviceDirection方法，這里我的做法就是根據當前狀態欄方向判斷攝像頭方向。

代碼實現：

  /// 獲取當前攝像頭方向
    ///
    /// - Returns: <#return value description#>
    func getDeviceDirection() -> AVCaptureVideoOrientation{
        switch UIApplication.shared.statusBarOrientation {
        case .landscapeLeft:
            return AVCaptureVideoOrientation.landscapeLeft
        case .landscapeRight:
            return AVCaptureVideoOrientation.landscapeRight
        case .portrait:
            return AVCaptureVideoOrientation.portrait
        case .portraitUpsideDown:
            return AVCaptureVideoOrientation.portraitUpsideDown
        default:
            return AVCaptureVideoOrientation.landscapeRight
        }
    }