iOS 13 introduces a new design of modalPresentationStyle .pageSheet (and its sibling .formSheet) for modally presented view controllers…

IOS 13为以模式呈现的视图控制器…引入了modalPresentationStyle.pageSheet(及其兄弟项.formSheet)的新设计

…and we can dismiss these sheets by sliding the presented view controller down (interactive dismissal). Although the new "pull-to-dismiss" feature is pretty useful, it may not always be desirable.

…我们可以通过向下滑动显示的视图控制器来取消这些工作表(交互式取消)。尽管新的“拉到解雇”功能非常有用，但它可能并不总是令人满意的。

THE QUESTION: How can we turn the interactive dismissal off?
- Bear in mind we keep the presentation style the same.

问题是：我们如何才能关闭互动解雇？-请记住，我们的演示风格保持不变。

优秀答案推荐

Option 1:

viewController.isModalInPresentation = true

(Disabled interactive .pageSheet dismissal acts like this.)

(禁用的交互式.pageSheet取消如下所示。)

• Since the iOS 13, UIViewController contains a new property called isModalInPresentation which must be set to true to prevent the interactive dismissal.


• It basically ignores events outside the view controller's bounds. Bear that in mind if you are using not only the automatic style but also presentation styles like .popover etc.


• This property is false by default.

From the official docs: If true, UIKit ignores events outside the view controller's bounds and prevents the interactive dismissal of the view controller while it is onscreen.

---

Option 2:

func presentationControllerShouldDismiss(_ presentationController: UIPresentationController) -> Bool {
    return false
}

• Since the iOS 13, UIAdaptivePresentationControllerDelegate contains a new method called presentationControllerShouldDismiss.


• This method is called only if the presented view controller is not dismissed programmatically and its isModalInPresentation property is set to false.

Tip: Don't forget to assign presentationController's delegate. But be aware, it is known that even just accessing the presentationController can cause a memory leak.

1. If you want the same behaviour as it's in previous iOS version (< iOS13) like model presentation in fullscreen, just set the presentation style of your destination view controller to UIModalPresentationStyle.fullScreen

   
   
   

   let someViewController = \*VIEW CONTROLLER*\
   someViewController.modalPresentationStyle = .fullScreen
   

   
   
   

   And if you are using storyboard just select the segua and select Full Screen form the Presentation dropdown.

   
   
   

   




2. If you just want to disable the interactive dismissal and keep the new presentation style set UIViewController property isModalInPresentation to true.

   
   
   

   if #available(iOS 13.0, *) {
       someViewController.isModalInPresentation = true // available in IOS13
   }
   

The property isModalInPresentation might help.

属性isModalInPresentation可能会有所帮助。

From the documentation:

从文档中：

When you set it to true, UIKit ignores events outside the view controller's bounds and prevents the interactive dismissal of the view controller while it is onscreen.

You can use it like this:

您可以这样使用它：

let controller = MyViewController()
controller.isModalInPresentation = true
self.present(controller, animated: true, completion: nil)

If you have some business logic, something like all fields should be filled before dismissing, you should:

如果您有一些业务逻辑，比如在解雇之前应该填写所有字段，您应该：

On ViewDidLoad if your ViewController has been presented within a Navigation Controller:

在ViewDidLoad上，如果您的ViewController已在导航控制器中显示：

func viewDidLoad() { 
    self.navigationController?.presentationController?.delegate = self
}

If not, simply use

如果不是，只需使用

func viewDidLoad() { 
    self.presentationController?.delegate = self
}

Then implement the delegate method:

然后实现委托方法：

extension ViewController: UIAdaptivePresentationControllerDelegate {

    func presentationControllerShouldDismiss(_ presentationController: UIPresentationController) -> Bool {
        guard let text = firstName.text, text.isEmpty else { return false }
        guard let text = lastName.text, text.isEmpty else { return false }
        ...
    
        return true
    }

}

If you are using storyboards to layout your UI I have found the best way to disable this interactive dismissal when using a navigation controller is to change the presentation of the Navigation Controller in the attribute inspector from Automatic to Full Screen. All view controllers in your navigation stack will then be full screen and will not be able to be dismissed by the user.

如果您正在使用情节提要来布局您的UI，我已经找到了在使用导航控制器时禁用此交互取消的最佳方法是将属性检查器中导航控制器的显示从自动更改为全屏。然后，您的导航堆栈中的所有视图控制器都将是全屏的，并且不能被用户取消。

Attribute Inspector showing presentation option for the navigation controller

显示导航控制器显示选项的属性检查器

Apple shared a sample code about it at this link

苹果在这个链接上分享了一个关于它的示例代码

It uses isModalInPresentation as many users suggestion.

它使用ismodalInPresentation作为许多用户的建议。

i was try to so hard for solve this problem but the solution are work for me is i select ViewController in **mainstoryboard > inspector > presentation > Full Screen ** default Automatic to change FullScreen

我一直很努力地试图解决这个问题，但我的解决方案是在**主故事板>检查器>演示>全屏**默认自动更改全屏中选择查看控制器

it's work for me

这是我的工作

All solutions are good, but in my case, I need an option to stop movement.
So this is a code for that.

所有的解决方案都是好的，但在我的情况下，我需要一个停止移动的选择。所以这就是一个代码。

if you want to block movement:

如果要阻止移动：

self.yourViewController?.presentedView?.gestureRecognizers?[0].isEnabled = false

And if you want to unblock movement:

如果你想解除移动障碍：

self.yourViewController?.presentedView?.gestureRecognizers?[0].isEnabled = true