检测表在iOS 13被驳回
在iOS 13之前,显示的视图控制器用于覆盖整个屏幕。并且,当解除时,执行父视图控制器检测表在iOS 13被驳回,ios,swift,uiviewcontroller,uikit,ios13,Ios,Swift,Uiviewcontroller,Uikit,Ios13,在iOS 13之前,显示的视图控制器用于覆盖整个屏幕。并且,当解除时,执行父视图控制器viewdideappear功能 现在iOS 13将视图控制器显示为默认的工作表,这意味着卡将部分覆盖基础视图控制器,这意味着不会调用viewdideappear,因为父视图控制器从未实际消失 是否有方法检测显示的视图控制器工作表已被取消?我可以在父视图控制器中替代某些其他功能,而不是使用某种委托 是否有方法检测显示的视图控制器工作表已被取消 对 我可以在父视图控制器中替代某些其他函数,而不是使用某种委托 不,
viewdideappear
功能
现在iOS 13将视图控制器显示为默认的工作表,这意味着卡将部分覆盖基础视图控制器,这意味着不会调用viewdideappear
,因为父视图控制器从未实际消失
是否有方法检测显示的视图控制器工作表已被取消?我可以在父视图控制器中替代某些其他功能,而不是使用某种委托
是否有方法检测显示的视图控制器工作表已被取消
对
我可以在父视图控制器中替代某些其他函数,而不是使用某种委托
不,“某种委托”是你如何做的。让自己成为演示控制器的委托人,并覆盖
PresentationControllerDidDisclease(:)
缺少一般运行时生成的事件来通知您显示的视图控制器(无论是否全屏显示)已被取消,这确实很麻烦;但这并不是一个新问题,因为始终存在非全屏显示的视图控制器。只是现在(在iOS 13中)它们的数量更多了!我在其他地方专门就这个主题提出了一个单独的问题和答案:。对于未来的读者,这里有一个更完整的答案,包括实现:
下面是一个父视图控制器的代码示例,当它显示为图纸的子视图控制器(即默认的iOS 13方式)被取消时,会收到通知:
公共最终类父类:UIViewController、UIAdaptivePresentationControllerDelegate
{
//这是假设segue是一个故事板segue;
//如果您是手动演示,只需在那里看到学员即可。
public override func prepare(对于segue:UIStoryboardSegue,发送方:Any?)
{
如果segue.identifier==“mySegue”{
segue.destination.presentationController?.delegate=self;
}
}
公共职能代表控制器(
_presentationController:UIPresentationController)
{
//仅在通过拖动取消图纸时调用。
//如果你给孩子打电话,你需要一些额外的东西。
//(我在孩子身上发现了压倒一切的解雇
//presentationController.delegate?.presentationController.delegate
//工作正常)。
}
}
Jerland2的答案很混乱,因为(a)原始提问者希望在工作表被撤销时得到函数调用(而他实现了PresentationControllerDidAttemptoDismiss,当用户尝试撤销工作表失败时调用该函数),以及(b)设置isModalInPresentation是完全正交的,实际上会使显示的图纸不可拆卸(这与OP想要的相反)。另一个返回
视图的选项将出现,并且视图显示已设置
let vc = UIViewController()
vc.modalPresentationStyle = .fullScreen
此选项覆盖全屏,并在关闭后调用上述方法调用presentingViewController.viewWillDisplay不是很简单吗?
解雇之前
self.presentingViewController?.viewWillAppear(false)
self.dismiss(animated: true, completion: nil)
在我看来,苹果不应该将pageSheet
设置为默认的modalPresentationStyle
我想通过使用swizzling
像这样:
private func _swizzling(forClass: AnyClass, originalSelector: Selector, swizzledSelector: Selector) {
if let originalMethod = class_getInstanceMethod(forClass, originalSelector),
let swizzledMethod = class_getInstanceMethod(forClass, swizzledSelector) {
method_exchangeImplementations(originalMethod, swizzledMethod)
}
}
extension UIViewController {
static func preventPageSheetPresentationStyle () {
UIViewController.preventPageSheetPresentation
}
static let preventPageSheetPresentation: Void = {
if #available(iOS 13, *) {
_swizzling(forClass: UIViewController.self,
originalSelector: #selector(present(_: animated: completion:)),
swizzledSelector: #selector(_swizzledPresent(_: animated: completion:)))
}
}()
@available(iOS 13.0, *)
private func _swizzledPresent(_ viewControllerToPresent: UIViewController,
animated flag: Bool,
completion: (() -> Void)? = nil) {
if viewControllerToPresent.modalPresentationStyle == .pageSheet
|| viewControllerToPresent.modalPresentationStyle == .automatic {
viewControllerToPresent.modalPresentationStyle = .fullScreen
}
_swizzledPresent(viewControllerToPresent, animated: flag, completion: completion)
}
}
然后将此行放到您的AppDelegate
UIViewController.preventPageSheetPresentationStyle()
拖动或调用Disclease FUNC将使用以下代码
1) 在根视图控制器中,您可以告诉它哪个是它的表示视图控制器,如下代码所示
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if segue.identifier == "presenterID" {
let navigationController = segue.destination as! UINavigationController
if #available(iOS 13.0, *) {
let controller = navigationController.topViewController as! presentationviewcontroller
// Modal Dismiss iOS 13
controller.presentationController?.delegate = self
} else {
// Fallback on earlier versions
}
navigationController.presentationController?.delegate = self
}
}
2) 同样,在根视图控制器中,您可以告诉用户当其表示视图控制器失效时将执行什么操作
public func presentationControllerDidDismiss(
_ presentationController: UIPresentationController)
{
print("presentationControllerDidDismiss")
}
1) 在演示视图控制器中,当您点击此图片中的“取消”或“保存”按钮时。将调用下面的代码
self.dismiss(animated: true) {
self.presentationController?.delegate?.presentationControllerDidDismiss?(self.presentationController!)
}
覆盖视图将在被解除的UIViewController
上消失。它将通过isbeingdisembleed
boolean标志提醒您解雇
override func viewWillDisappear(_ animated: Bool) {
super.viewWillDisappear(animated)
if isBeingDismissed {
print("user is dismissing the vc")
}
}
**如果用户在向下刷卡的中途将卡刷回,即使卡没有被解除,它仍然会注册为被解除。但这是一个你可能不关心的边缘案例。Swift
调用的通用解决方案视图将出现在iOS13
class ViewController: UIViewController {
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
print("viewWillAppear")
}
//Show new viewController
@IBAction func show(_ sender: Any) {
let newViewController = NewViewController()
//set delegate of UIAdaptivePresentationControllerDelegate to self
newViewController.presentationController?.delegate = self
present(newViewController, animated: true, completion: nil)
}
}
extension UIViewController: UIAdaptivePresentationControllerDelegate {
public func presentationControllerDidDismiss( _ presentationController: UIPresentationController) {
if #available(iOS 13, *) {
//Call viewWillAppear only in iOS 13
viewWillAppear(true)
}
}
}
如果在全屏中使用ModalPresentationStyle,控制器的行为将恢复正常
consultarcontrollerconsultar=this.Storyboard.instanceeviewcontroller(“ConsultarController”)作为ConsultarController;
controllerConsultar.ModalPresentationStyle=UIModalPresentationStyle.FullScreen;
this.NavigationController.PushViewController(controllerConsultar,true) 如果有人无法访问显示的视图控制器,他们可以在显示视图控制器时覆盖以下方法,并将modalPresentationStyle
更改为fullScreen
,或者使用此方法添加上述策略之一
override func present(_ viewControllerToPresent: UIViewController, animated flag: Bool, completion: (() -> Void)? = nil) {
if let _ = viewControllerToPresent as? TargetVC {
viewControllerToPresent.modalPresentationStyle = .fullScreen
}
super.present(viewControllerToPresent, animated: flag, completion: completion)
}
如果显示的视图控制器是导航控制器,并且您希望检查根控制器,则可以将上述条件更改为
if let _ = (viewControllerToPresent as? UINavigationController)?.viewControllers.first as? TargetVC {
viewControllerToPresent.modalPresentationStyle = .fullScreen
}
如果您想在用户从该工作表中关闭模式工作表时执行某些操作。
让我们假设您已经有了一个带有@IBAction
的关闭按钮和一个在closi之前显示警报的逻辑
class ViewController: UIViewController {
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
print("viewWillAppear")
}
//Show new viewController
@IBAction func show(_ sender: Any) {
let newViewController = NewViewController()
//set delegate of UIAdaptivePresentationControllerDelegate to self
newViewController.presentationController?.delegate = self
present(newViewController, animated: true, completion: nil)
}
}
extension UIViewController: UIAdaptivePresentationControllerDelegate {
public func presentationControllerDidDismiss( _ presentationController: UIPresentationController) {
if #available(iOS 13, *) {
//Call viewWillAppear only in iOS 13
viewWillAppear(true)
}
}
}
override func present(_ viewControllerToPresent: UIViewController, animated flag: Bool, completion: (() -> Void)? = nil) {
if let _ = viewControllerToPresent as? TargetVC {
viewControllerToPresent.modalPresentationStyle = .fullScreen
}
super.present(viewControllerToPresent, animated: flag, completion: completion)
}
if let _ = (viewControllerToPresent as? UINavigationController)?.viewControllers.first as? TargetVC {
viewControllerToPresent.modalPresentationStyle = .fullScreen
}
class MyModalSheetViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
self.presentationController?.delegate = self
}
@IBAction func closeAction(_ sender: Any) {
// your logic to decide to close or not, when to close, etc.
}
}
extension MyModalSheetViewController: UIAdaptivePresentationControllerDelegate {
func presentationControllerShouldDismiss(_ presentationController: UIPresentationController) -> Bool {
return false // <-prevents the modal sheet from being closed
}
func presentationControllerDidAttemptToDismiss(_ presentationController: UIPresentationController) {
closeAction(self) // <- called after the modal sheet was prevented from being closed and leads to your own logic
}
}
func sheet<Item, Content>(item: Binding<Item?>, onDismiss: (() -> Void)?, content: (Item) -> Content) -> some View