Question

在Objective-C中你可以这样做：

if ( UIDeviceOrientationIsPortrait( deviceOrientation ) || UIDeviceOrientationIsLandscape( deviceOrientation ) ) {
    AVCaptureVideoPreviewLayer *previewLayer = (AVCaptureVideoPreviewLayer *)self.previewView.layer;
    previewLayer.connection.videoOrientation = (AVCaptureVideoOrientation)deviceOrientation;
}

但是在Swift中，翻译最后一行的最佳方法是什么？您不能将＆device 34设备定义为AVCaptureVideoOrientation＆＃34;。

到目前为止我能想出的最好的是：

    if(UIDeviceOrientationIsPortrait(deviceOrientation) || UIDeviceOrientationIsLandscape(deviceOrientation)) {
        let myPreviewLayer: AVCaptureVideoPreviewLayer = self.previewLayer
        myPreviewLayer.connection.videoOrientation = AVCaptureVideoOrientation.init(rawValue: deviceOrientation.rawValue-1)!
    }

但这似乎不够优雅。 -1是因为它只是一天结束时的枚举，并且UIDeviceOrientation枚举有一个＆＃34;未知＆＃34;位于0的AVCaptureVideoOrientation没有...

Answer 1

这在 swift 4 ：

上做得很好

previewLayer.connection?.videoOrientation = AVCaptureVideoOrientation(rawValue: UIApplication.shared.statusBarOrientation.rawValue)!

Answer 2

试试这个

let avLayer = (self.previewView.layer as AVCaptureVideoPreviewLayer)
let connection = avLayer.connection
let orientation = AVCaptureVideoOrientation(rawValue: self.interfaceOrientation.rawValue)!
connection.videoOrientation = orientation

Answer 3

这是我得到的转换：

if UIDeviceOrientationIsPortrait(deviceOrientation) || UIDeviceOrientationIsLandscape(deviceOrientation) {
    var previewLayer: AVCaptureVideoPreviewLayer = previewView.layer
    previewLayer.connection.videoOrientation = deviceOrientation
}

The converter I used往往不知道代码应该看起来像什么时候（Int与CGFloat），所以如果不进行调试，它可能无法正常工作。让我知道它是否符合您的要求，例如，变量可能会更改为常量。

Answer 4

connection.videoOrientation = AVCaptureVideoOrientation.Portrait

您可以在swift头文件中找到常量AVCaptureVideoOrientation值。（斯威夫特2）

你如何在Swift 2中设置previewLayer.connection.videoOrientation？

4 个答案: