在iOS 13中,模态视图控制器在呈现时有一个新的行为。

现在它不是全屏默认情况下,当我向下滑动时,应用会自动解除视图控制器。

我怎么能防止这种行为,并回到旧的全屏模态vc?

谢谢


当前回答

最新版本为iOS 13和Swift 5.x

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

vc。modalPresentationStyle = .fullScreen

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

其他回答

我通过使用方法swizzling(Swift 4.2)实现了它:

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:调用swizzling代码通过调用:

UIViewController.setPresentationStyle_fullScreen()

对于Objective-C用户

只需使用这段代码

 [vc setModalPresentationStyle: UIModalPresentationFullScreen];

或者如果你想在iOS 13.0中添加它,那么使用

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

我添加的信息可能对某人有用。如果你有任何故事板segue,要回到旧的风格,你需要将kind属性设置为modal Present,并将Presentation属性设置为全屏。

设置导航控制器。modalPresentationStyle到。fullscreen已经重复了一千多次了,但让我给你们展示另一个阻止器,它会导致UIViewController / UINavigationController没有在全屏显示,即使所有的属性都设置正确。

对我来说,罪魁祸首就藏在这条线里

navigationController?.presentationController?.delegate = self

显然,当设置UIAdaptivePresentationControllerDelegate时,你需要在可选的delegate方法中指定表示样式

    public func adaptivePresentationStyle(for controller: UIPresentationController) -> UIModalPresentationStyle {
        presentationStyle
    }

另一种方法是在你的应用程序中拥有你自己的基本视图控制器组件,并通过一个基本的设置来实现指定的和必需的初始化器,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:如果你的视图控制器包含在一个以模态方式呈现的导航控制器中,那么导航控制器应该以同样的方式处理这个问题(也就是说,用同样的方式定制你的自定义导航控制器组件)

在Xcode 11.1、iOS 13.1和iOS 12.4上测试

希望能有所帮助