ios - 如何在 iOS 中将相机 View 方向锁定为横向？

Question

我想修复横向模式下的相机 View 。当用户将 View 旋转为纵向时，还会显示警报。有什么解决办法吗？

Answer 1

将其放入 View Controller 中:

override func viewWillTransition(to size: CGSize, with coordinator: UIViewControllerTransitionCoordinator) {
    if UIDevice.current.orientation.isLandscape {
        print("will turn to landscape")
    } else {
        print("will turn to portrait")
        //print an alert box here
        UIDevice.current.setValue(UIInterfaceOrientation.landscapeLe‌​ft.rawValue, forKey: "orientation")
    }
}

来源:How to detect orientation change?

或者将其放入需要横向显示的 View 中:

override func shouldAutorotate() -> Bool {
    return false
}

override func supportedInterfaceOrientations() -> UIInterfaceOrientationMask {
    return UIInterfaceOrientationMask.landscape
}

但是这个无法发布警报。