全屏显示iOS 13中的模态

在iOS 13中，出现模态视图控制器时有新行为。

现在默认情况下它不是全屏显示，当我尝试向下滑动时，该应用程序会自动关闭View Controller。

如何防止这种行为并回到旧的全屏模式vc？

谢谢

如WWDC 2019期间平台联盟中所述，使用iOS 13，Apple引入了新的默认卡演示文稿。为了强制全屏，您必须使用以下命令明确指定它：

let vc = UIViewController()
vc.modalPresentationStyle = .fullScreen //or .overFullScreen for transparency
self.present(vc, animated: true, completion: nil)

我添加了对某人可能有用的信息。如果您有任何故事板segue，那么要回到旧样式，需要将kind属性设置为Present Modally并将Presentation属性设置为Full Screen。

在启动屏幕之后的初始视图中，我遇到了这个问题。因为我没有定义顺序或逻辑，所以对我的解决方法是将演示文稿从自动切换到全屏，如下所示：

有多种方法可以做到这一点，我认为每个项目都可以适合一个项目，但又不适合另一个项目，所以我认为我会保留在这里，也许其他人会遇到不同的情况。

1-覆盖存在

如果您有一个BaseViewController，则可以覆盖该present(_ viewControllerToPresent: animated flag: completion:)方法。

class BaseViewController: UIViewController {

  // ....

  override func present(_ viewControllerToPresent: UIViewController,
                        animated flag: Bool,
                        completion: (() -> Void)? = nil) {
    viewControllerToPresent.modalPresentationStyle = .fullScreen
    super.present(viewControllerToPresent, animated: flag, completion: completion)
  }

  // ....
}

使用这种方式，您无需对任何present调用进行任何更改，因为我们只是覆盖了该present方法。

2-扩展名：

extension UIViewController {
  func presentInFullScreen(_ viewController: UIViewController,
                           animated: Bool,
                           completion: (() -> Void)? = nil) {
    viewController.modalPresentationStyle = .fullScreen
    present(viewController, animated: animated, completion: completion)
  }
}

用法：

presentInFullScreen(viewController, animated: true)

3-对于一个UIViewController

let viewController = UIViewController()
viewController.modalPresentationStyle = .fullScreen
present(viewController, animated: true, completion: nil)

4-从情节提要

选择一个序列并将演示文稿设置为FullScreen。

5-漩涡

extension UIViewController {

  static func swizzlePresent() {

    let orginalSelector = #selector(present(_: animated: completion:))
    let swizzledSelector = #selector(swizzledPresent)

    guard let orginalMethod = class_getInstanceMethod(self, orginalSelector), let swizzledMethod = class_getInstanceMethod(self, swizzledSelector) else{return}

    let didAddMethod = class_addMethod(self,
                                       orginalSelector,
                                       method_getImplementation(swizzledMethod),
                                       method_getTypeEncoding(swizzledMethod))

    if didAddMethod {
      class_replaceMethod(self,
                          swizzledSelector,
                          method_getImplementation(orginalMethod),
                          method_getTypeEncoding(orginalMethod))
    } else {
      method_exchangeImplementations(orginalMethod, swizzledMethod)
    }

  }

  @objc
  private func swizzledPresent(_ viewControllerToPresent: UIViewController,
                               animated flag: Bool,
                               completion: (() -> Void)? = nil) {
    if #available(iOS 13.0, *) {
      if viewControllerToPresent.modalPresentationStyle == .automatic {
        viewControllerToPresent.modalPresentationStyle = .fullScreen
      }
    }
    swizzledPresent(viewControllerToPresent, animated: flag, completion: completion)
   }
}

用法：
在您的AppDelegate内部application(_ application: didFinishLaunchingWithOptions)添加以下行：

UIViewController.swizzlePresent()

使用这种方式，您不需要在任何当前调用上进行任何更改，因为我们正在运行时替换当前方法的实现。
如果您想知道什么在泛滥，可以查看以下链接：https : //nshipster.com/swift-objc-runtime/

我在iOS 13上使用了swizzling

import Foundation
import UIKit

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 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, *)
    @objc 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)
    }
}

然后把这个

UIViewController.preventPageSheetPresentation

某处

例如在AppDelegate中

func application(_ application: UIApplication,
                 didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey : Any]?) -> Bool {

    UIViewController.preventPageSheetPresentation
    // ...
    return true
}

对于Objective-C用户

只需使用此代码

 [vc setModalPresentationStyle: UIModalPresentationFullScreen];

或者，如果要在iOS 13.0中添加它，请使用

 if (@available(iOS 13.0, *)) {
     [vc setModalPresentationStyle: UIModalPresentationFullScreen];
 } else {
     // Fallback on earlier versions
 }

一线：

modalPresentationStyle需要被上设置navigationController 正被呈现。

iOS 13及以下版本的iOS全屏，overCurrentContext并带有和 navigationController

测试代码

let controller = UIViewController()
let navigationController = UINavigationController(rootViewController: controller)
navigationController.modalPresentationStyle = .overCurrentContext
self.navigationController?.present(navigationController, animated: true, completion: nil)

modalPresentationStyle需要在navigationController处设置。

提示：如果您调用当前存在于ViewController内嵌在中的NavigationController，则必须将设置NavigationController为.fullScreen而不是VC。

您可以像@davidbates一样执行此操作，也可以以编程方式（例如@pascalbros）来执行。

一个示例场景：

    //BaseNavigationController: UINavigationController {}
    let baseNavigationController = storyboard!.instantiateViewController(withIdentifier: "BaseNavigationController")
    var navigationController = UINavigationController(rootViewController: baseNavigationController)
    navigationController.modalPresentationStyle = .fullScreen
    navigationController.topViewController as? LoginViewController
    self.present(navigationViewController, animated: true, completion: nil)

我需要两者都做：

1. 将演示文稿样式设置为全屏

   

2. 将顶部栏设置为半透明导航栏

modalPresentationStyle演示前进行更改

vc.modalPresentationStyle = UIModalPresentationFullScreen;

这是一个简单的解决方案，无需编码一行。

• 在情节提要中选择视图控制器
• 选择属性检查器
• 如下图所示，将演示文稿“自动”设置为“全屏”

此更改使iPad应用程序的行为符合预期，否则新屏幕将在弹出窗口的中央显示。

如果您的UITabController的屏幕带有嵌入式导航控制器，则必须将UITabController Presentation设置为FullScreen，如下图所示

这是Objective-C的解决方案

UIStoryboard *storyBoard = [UIStoryboard storyboardWithName:@"Main" bundle:nil];
ViewController *vc = [storyBoard instantiateViewControllerWithIdentifier:@"ViewController"];

vc.modalPresentationStyle = UIModalPresentationFullScreen;

[self presentViewController:vc animated:YES completion:nil];

最新适用于iOS 13和Swift 5.x

let vc = ViewController(nibName: "ViewController", bundle: nil)

vc.modalPresentationStyle = .fullScreen

self.present(vc, animated: true, completion: nil)

这是我在ObjectiveC中使用类别修复的版本。使用这种方法，您将拥有默认的UIModalPresentationStyleFullScreen行为，直到另外一个显式设置为止。

#import "UIViewController+Presentation.h"
#import "objc/runtime.h"

@implementation UIViewController (Presentation)

- (void)setModalPresentationStyle:(UIModalPresentationStyle)modalPresentationStyle {
    [self setPrivateModalPresentationStyle:modalPresentationStyle];
}

-(UIModalPresentationStyle)modalPresentationStyle {
    UIModalPresentationStyle style = [self privateModalPresentationStyle];
    if (style == NSNotFound) {
        return UIModalPresentationFullScreen;
    }
    return style;
}

- (void)setPrivateModalPresentationStyle:(UIModalPresentationStyle)modalPresentationStyle {
    NSNumber *styleNumber = [NSNumber numberWithInteger:modalPresentationStyle];
     objc_setAssociatedObject(self, @selector(privateModalPresentationStyle), styleNumber, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
}

- (UIModalPresentationStyle)privateModalPresentationStyle {
    NSNumber *styleNumber = objc_getAssociatedObject(self, @selector(privateModalPresentationStyle));
    if (styleNumber == nil) {
        return NSNotFound;
    }
    return styleNumber.integerValue;
}

@end

所有其他答案都足够了，但是对于像我们这样的大型项目，无论是在代码还是在情节提要中进行导航，这都是一项艰巨的任务。

对于那些正在积极使用Storyboard的人。这是我的建议：使用Regex。

以下格式不适用于全屏页面：

<segue destination="Bof-iQ-svK" kind="presentation" identifier="importSystem" modalPresentationStyle="fullScreen" id="bfy-FP-mlc"/>

以下格式适合全屏页面：

<segue destination="7DQ-Kj-yFD" kind="presentation" identifier="defaultLandingToSystemInfo" modalPresentationStyle="fullScreen" id="Mjn-t2-yxe"/>

以下与VS CODE兼容的正则表达式会将所有旧样式页面转换为新样式页面。如果您使用其他正则表达式引擎/文本编辑器，则可能需要转义特殊字符。

搜索正则表达式

<segue destination="(.*)"\s* kind="show" identifier="(.*)" id="(.*)"/>

替换正则表达式

<segue destination="$1" kind="presentation" identifier="$2" modalPresentationStyle="fullScreen" id="$3"/>

最初，默认值是fullscreenmodalPresentationStyle，但在iOS 13中，其对UIModalPresentationStyle.automatic。

如果要制作全屏视图控制器，则必须将更modalPresentationStyle改为fullScreen。

请参阅UIModalPresentationStyle Apple文档以获取更多详细信息，并参阅Apple人机界面指南以了解应在哪里使用哪种模式。

您可以轻松做到这一点，将故事板作为源代码打开并搜索kind="presentation"，在所有带有kind = presentation的seague标签中添加一个额外的属性modalPresentationStyle="fullScreen"

let Obj = MtViewController()
Obj.modalPresentationStyle = .overFullScreen
self.present(Obj, animated: true, completion: nil)

//如果您要禁用滑动以关闭它，请添加行

Obj.isModalInPresentation = true

检查Apple文档以获取更多信息。

我通过使用swizzling（Swift 4.2）方法实现的：

要创建UIViewController扩展，如下所示

extension UIViewController {

    @objc private func swizzled_presentstyle(_ viewControllerToPresent: UIViewController, animated: Bool, completion: (() -> Void)?) {

        if #available(iOS 13.0, *) {
            if viewControllerToPresent.modalPresentationStyle == .automatic || viewControllerToPresent.modalPresentationStyle == .pageSheet {
                viewControllerToPresent.modalPresentationStyle = .fullScreen
            }
        }

        self.swizzled_presentstyle(viewControllerToPresent, animated: animated, completion: completion)
    }

     static func setPresentationStyle_fullScreen() {

        let instance: UIViewController = UIViewController()
        let aClass: AnyClass! = object_getClass(instance)

        let originalSelector = #selector(UIViewController.present(_:animated:completion:))
        let swizzledSelector = #selector(UIViewController.swizzled_presentstyle(_:animated:completion:))

        let originalMethod = class_getInstanceMethod(aClass, originalSelector)
        let swizzledMethod = class_getInstanceMethod(aClass, swizzledSelector)
        if let originalMethod = originalMethod, let swizzledMethod = swizzledMethod {
        method_exchangeImplementations(originalMethod, swizzledMethod)
        }
    }
}

在AppDelegate中，在application：didFinishLaunchingWithOptions中：通过调用以下代码来调用混乱的代码：

UIViewController.setPresentationStyle_fullScreen()

这为我工作：

yourViewController.modalPresentationStyle = UIModalPresentationStyle.fullScreen

为UIViewController创建一个类别（例如UIViewController + PresentationStyle）。向其添加以下代码。

 -(UIModalPresentationStyle)modalPresentationStyle{
     return UIModalPresentationStyleFullScreen;
}

一种替代方法是在您的应用程序中拥有您自己的基本viewcontroller组件，并仅通过基本设置来实现指定的和必需的初始化程序，如下所示：

class MyBaseViewController: UIViewController {

//MARK: Initialisers

/// Alternative initializer which allows you to set the modal presentation syle
/// - Parameter modalStyle: the presentation style to be used
init(with modalStyle:UIModalPresentationStyle) {
    super.init(nibName: nil, bundle: nil)
    self.setup(modalStyle: modalStyle)
}

override init(nibName nibNameOrNil: String?, bundle nibBundleOrNil: Bundle?) {
    super.init(nibName: nibNameOrNil, bundle: nibBundleOrNil)
    // default modal presentation style as fullscreen
    self.setup(modalStyle: .fullScreen)
}

required init?(coder: NSCoder) {
    super.init(coder: coder)
    // default modal presentation style as fullscreen
    self.setup(modalStyle: .fullScreen)
}

//MARK: Private

/// Setup the view
///
/// - Parameter modalStyle: indicates which modal presentation style to be used
/// - Parameter modalPresentation: default true, it prevent modally presented view to be dismissible with the default swipe gesture
private func setup(modalStyle:UIModalPresentationStyle, modalPresentation:Bool = true){
    if #available(iOS 13, *) {
        self.modalPresentationStyle = modalStyle
        self.isModalInPresentation = modalPresentation
    }
}

注意：如果视图控制器包含在实际以模态形式显示的导航控制器中，则导航控制器应以相同的方式解决此问题（即，以相同的方式自定义自定义导航控制器组件

在iOS 13.1和iOS 12.4的Xcode 11.1上测试

希望能帮助到你

我遇到了视频无法再全屏显示的问题。添加了这一行，它节省了一天:-)

videoController.modalPresentationStyle = UIModalPresentationFullScreen;

最适合我的解决方案。

viewController.modalPresentationStyle = .fullScreen

如果您使用UINavigationController并将ViewController嵌入为根视图控制器，那么您也会遇到同样的问题。使用以下代码来克服。

let vc = UIViewController()
let navController = UINavigationController(rootViewController: vc)
navController.modalPresentationStyle = .fullScreen

class MyViewController: UIViewController {

    convenience init() {
        self.init(nibName:nil, bundle:nil)
        self.modalPresentationStyle = .fullScreen
    }

    override func viewDidLoad() {
        super.viewDidLoad()
    }
}

self.modalPresentationStyle = .fullScreen可以为UIViewController子类化，而不必在每个视图控制器上调用，而可以MyViewController在任何地方使用。

上面的答案和建议是正确的，下面是另一个版本，并且是通过编程有效使用的方式。

＃1创建一个UIView扩展

＃2创建一个方法（）

//#1
extension UIViewController {

//#2
func presentLocal(_ viewControllerToPresent: UIViewController, animated flag: 
Bool, completion: (() -> Void)? = nil) {

//Reusing below 2 lines :-)
viewControllerToPresent.modalPresentationStyle = .overCurrentContext
self.present(viewControllerToPresent, animated: flag, completion: completion)

  }
}

如下调用

let vc = MyViewController()
let nc = UINavigationController(rootViewController: vc)
sourceView.presentLocal(nc, animated: true, completion: nil)

要么

let vc = MyViewController()
sourceView.presentLocal(vc, animated: true, completion: nil)