iOS 外接显示器不填满屏幕

Question

我的应用程序通过 Thunderbolt 转 HDMI 适配器在外部显示器上显示图像/视频。工作正常，但屏幕不填满。有某种边缘框架我不知道如何摆脱。它是相等的，大约50px，上，下，左，右..这是图像的代码:

func addImage(image: UIImage){
    if UIScreen.screens().count > 1 {
        let secondScreen = UIScreen.screens()[1]
        secondWindow = UIWindow(frame: secondScreen.bounds)
        print(secondScreen.bounds) // 1920x1080
        //secondWindow?.layoutMargins = UIEdgeInsets(top: 0, left: 0, bottom: 0, right: 0) // Tried.. no change
        secondWindow?.screen = secondScreen
        secondScreenView = UIView(frame: secondWindow!.frame)
        //secondScreenView?.layoutMargins = UIEdgeInsets(top: 0, left: 0, bottom: 0, right: 0) // Tried.. no change
        secondWindow?.addSubview(secondScreenView!)
        secondWindow?.hidden = false

        externalImage = UIImageView(frame: secondScreen.bounds)

        externalImage.contentMode = .ScaleAspectFit // Tried .ScaleAspectFill
        externalImage.image = image

        secondScreenView!.addSubview(externalImage)
    }else{
        noExternalDisplay()
    }
}

Answer 1

找到答案了!!

secondScreen.overscanCompensation = UIScreenOverscanCompensation(rawValue: 3)!