在我们正在开发的应用中,我们可以选择让用户选择首选方向(即,如果他们选择Portrait
,应用将锁定为纵向,而Landscape
则相同如果选择Both
,那么应用程序将适用于所有方向)我正在分享我尝试过的代码,而且我不确定此功能是否可行一点都不。
//MARK:- ORIENTATION
func changeOrientation(orientation: String) {
switch orientation {
case "Portrait":
UserDefaults.standard.set("Portrait", forKey: UserDefaultsKeys.preferredOrientation)
appDelegate.preferredOrientation = "Portrait"
let value = UIInterfaceOrientation.portrait.rawValue
UIDevice.current.setValue(value, forKey: "orientation")
break
case "Landscape":
UserDefaults.standard.set("Landscape", forKey: UserDefaultsKeys.preferredOrientation)
appDelegate.preferredOrientation = "Landscape"
let value = UIInterfaceOrientation.landscapeLeft.rawValue
UIDevice.current.setValue(value, forKey: "orientation")
break
default:
UserDefaults.standard.set("Both", forKey: UserDefaultsKeys.preferredOrientation)
appDelegate.preferredOrientation = "Both"
break
}
/*not necessary*/
let vc = UIViewController()
UIViewController.attemptRotationToDeviceOrientation()//forces to rotate
/*not necessary*/
self.present(vc, animated: false, completion: nil)
UIView.animate(withDuration: 0.3, animations: {
vc.dismiss(animated: false, completion: nil)
})
/*not necessary*/
}
open override var supportedInterfaceOrientations: UIInterfaceOrientationMask{
get {
switch appDelegate.preferredOrientation {
case "Portrait":
return .portrait
case "Landscape":
return .landscape
default:
return .all
}
}
}
open override var shouldAutorotate: Bool {
get {
return true
}
}
但是,如果我在纵向模式下选择“风景”,它会自动切换到风景。但是,如果我将设备旋转回肖像,它也可以正常工作(根据要求不应该工作)。该要求类似于我们仅使用纵向模式设置项目时的情况,以及当设备旋转到横向模式时它的行为方式。
答案 0 :(得分:3)
我刚刚写了一个示例项目来测试这是否可行。好吧,我想是的!不幸的是
UIViewController.attemptRotationToDeviceOrientation()
我没有神奇地完成这项工作,我希望如此 - 它比这复杂一点。
请使用以下代码获取战利品。你需要的所有魔法都发生在动作forceChangeOrientations
中。
class ViewController: UIViewController {
enum Orientation {
case Landscape
case Portrait
mutating func changeOrientation() {
if self == .Portrait {
self = .Landscape
}
else {
self = .Portrait
}
}
func supportedInterfaceOrientations() -> UIInterfaceOrientationMask {
switch self {
case .Landscape:
return .Landscape
case .Portrait:
return .Portrait
}
}
func preferredInterfaceOrientationForPresentation() -> UIInterfaceOrientation {
switch self {
case .Landscape:
return UIInterfaceOrientation.LandscapeLeft
case .Portrait:
return .Portrait
}
}
}
var currentOrientation: Orientation = .Portrait
// Returns a Boolean value indicating whether the view controller's contents should auto rotate.
override func shouldAutorotate() -> Bool {
return true
}
// Returns all of the interface orientations that the view controller supports.
override func supportedInterfaceOrientations() -> UIInterfaceOrientationMask {
return currentOrientation.supportedInterfaceOrientations() //UIInterfaceOrientationMask.All
}
// Returns the interface orientation to use when presenting the view controller.
override func preferredInterfaceOrientationForPresentation() -> UIInterfaceOrientation {
return UIInterfaceOrientation.Portrait
}
@IBAction func forceChangeOrientations(sender: AnyObject) {
self.currentOrientation.changeOrientation()
let value = self.currentOrientation.preferredInterfaceOrientationForPresentation().rawValue
UIDevice.currentDevice().setValue(value, forKey: "orientation")
UIViewController.attemptRotationToDeviceOrientation()
}
}