iOS 8 iPhone 上的 UIPopoverPresentationController

Question

有人知道UIPopoverPresentationController 是否可用于在 iPhone 上显示弹出框吗？想知道 Apple 是否在 iOS 8 上添加了此功能，以尝试为 iPad 和 iPhone 创建更统一的演示控制器。

不确定是否可以通过 Beta 提问/回答问题。在这种情况下我会删除它。

Answer 1

您可以使用 adaptivePresentationStyleForPresentationController: 方法可通过UIPopoverPresentationController.delegate 获得。

UIPresentationController 使用此方法询问要使用的新演示样式，在您的情况下，只需返回 UIModalPresentationNone 将导致 UIPopoverPresentationController 呈现为弹出窗口而不是全屏。

这是一个使用故事板中的 segue 设置的弹出框示例，从 UIBarButtonItem 到“present modally” UIViewController

class SomeViewController: UIViewController, UIPopoverPresentationControllerDelegate {

    // override func prepareForSegue(segue: UIStoryboardSegue!, sender: AnyObject!) { // swift < 3.0
    override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
        if segue.identifier == "PopoverSegue" {
            if let controller = segue.destinationViewController as? UIViewController {
                controller.popoverPresentationController.delegate = self
                controller.preferredContentSize = CGSize(width: 320, height: 186)                
            }
        }
    }

    // MARK: UIPopoverPresentationControllerDelegate

    //func adaptivePresentationStyleForPresentationController(controller: UIPresentationController!) -> UIModalPresentationStyle { // swift < 3.0
    func adaptivePresentationStyle(for controller: UIPresentationController) -> UIModalPresentationStyle {
        // Return no adaptive presentation style, use default presentation behaviour
        return .None
    }
}

WWDC 2014 session 214 "View Controller Advancement in iOS8" (36:30) 中提到了这个技巧

Answer 2

如果有人只想显示带有代码的弹出框，您可以使用以下方法。

目标 - C

声明UIPopoverPresentationController的属性：

@property(nonatomic,retain)UIPopoverPresentationController *dateTimePopover8;

使用以下方法从 UIButton 呈现弹出框：

- (IBAction)btnSelectDatePressed:(id)sender
{
    UINavigationController *destNav = [[UINavigationController alloc] initWithRootViewController:dateVC];/*Here dateVC is controller you want to show in popover*/
    dateVC.preferredContentSize = CGSizeMake(280,200);
    destNav.modalPresentationStyle = UIModalPresentationPopover;
    _dateTimePopover8 = destNav.popoverPresentationController;
    _dateTimePopover8.delegate = self;
    _dateTimePopover8.sourceView = self.view;
    _dateTimePopover8.sourceRect = sender.frame;
    destNav.navigationBarHidden = YES;
    [self presentViewController:destNav animated:YES completion:nil];
}

使用以下方法从 UIBarButtonItem 呈现弹出框：

- (IBAction)btnSelectDatePressed:(id)sender
{
    UINavigationController *destNav = [[UINavigationController alloc] initWithRootViewController:dateVC];/*Here dateVC is controller you want to show in popover*/
    dateVC.preferredContentSize = CGSizeMake(280,200);
    destNav.modalPresentationStyle = UIModalPresentationPopover;
    _dateTimePopover8 = destNav.popoverPresentationController;
    _dateTimePopover8.delegate = self;
    _dateTimePopover8.sourceView = self.view;
     CGRect frame = [[sender valueForKey:@"view"] frame];
    frame.origin.y = frame.origin.y+20;
    _dateTimePopover8.sourceRect = frame;
    destNav.navigationBarHidden = YES;
    [self presentViewController:destNav animated:YES completion:nil];
}

在你的视图控制器中也实现这个委托方法：

- (UIModalPresentationStyle) adaptivePresentationStyleForPresentationController: (UIPresentationController * ) controller {
    return UIModalPresentationNone;
}

要关闭此弹出框，只需关闭视图控制器即可。下面是关闭视图控制器的代码：

-(void)hideIOS8PopOver
{
    [self dismissViewControllerAnimated:YES completion:nil];
}

SWIFT

使用以下方法从 UIButton 呈现弹出框：

func filterBooks(sender: UIButon)
    {
        let filterVC =  FilterDistanceViewController(nibName: "FilterDistanceViewController", bundle: nil)
        var filterDistanceViewController = UINavigationController(rootViewController: filterVC)
        filterDistanceViewController.preferredContentSize = CGSizeMake(300, 205)
        let popoverPresentationViewController = filterDistanceViewController.popoverPresentationController
        popoverPresentationViewController?.permittedArrowDirections = .Any
        popoverPresentationViewController?.delegate = self
        popoverPresentationController?.barButtonItem = self.navigationItem.rightBarButtonItem
        popoverPresentationViewController!.sourceView = self.view;
        popoverPresentationViewController!.sourceRect = sender.frame

        filterDistanceViewController.modalPresentationStyle = UIModalPresentationStyle.Popover
        filterDistanceViewController.navigationBarHidden = true
        self.presentViewController(filterDistanceViewController, animated: true, completion: nil)
    }

使用以下方法从 UIBarButtonItem 呈现弹出框：

func filterBooks(sender: UIBarButtonItem)
    {
        let filterVC =  FilterDistanceViewController(nibName: "FilterDistanceViewController", bundle: nil)
        var filterDistanceViewController = UINavigationController(rootViewController: filterVC)
        filterDistanceViewController.preferredContentSize = CGSizeMake(300, 205)
        let popoverPresentationViewController = filterDistanceViewController.popoverPresentationController
        popoverPresentationViewController?.permittedArrowDirections = .Any
        popoverPresentationViewController?.delegate = self
        popoverPresentationController?.barButtonItem = self.navigationItem.rightBarButtonItem
        popoverPresentationViewController!.sourceView = self.view;
        var frame:CGRect = sender.valueForKey("view")!.frame
        frame.origin.y = frame.origin.y+20
        popoverPresentationViewController!.sourceRect = frame

        filterDistanceViewController.modalPresentationStyle = UIModalPresentationStyle.Popover
        filterDistanceViewController.navigationBarHidden = true
        self.presentViewController(filterDistanceViewController, animated: true, completion: nil)
    }

在你的视图控制器中也实现这个委托方法：

func adaptivePresentationStyleForPresentationController(controller: UIPresentationController) -> UIModalPresentationStyle{
        return .None
    }

请务必在 .h/.m/.swift 文件中添加委托 UIPopoverPresentationControllerDelegate

Answer 3

问题： iPhone 弹出框显示全屏并且不尊重preferredContentSize 值。

解决方案：与 Apple 在 UIPopoverPresentationController 类参考中的建议相反，在获得对弹出框呈现控制器的引用并配置它之后呈现视图控制器。

// Get the popover presentation controller and configure it.
//...

// Present the view controller using the popover style.
[self presentViewController:myPopoverViewController animated: YES completion: nil]; 

Answer 4

确保实现UIAdaptivePresentationControllerDelegate

像这样：

- (UIModalPresentationStyle)adaptivePresentationStyleForPresentationController:(UIPresentationController *)controller {
    return UIModalPresentationNone;
}

如果您不想要全屏弹出框

Answer 5

我找到了一些解决方法。

在 Xcode6.1 上，使用 presentationController.delegate 而不是 popoverPresentationController.delegate。

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
    if ([segue.identifier compare:@"showPopOver"] == NSOrderedSame) {
        UINavigationController * nvc = segue.destinationViewController;
        UIPresentationController * pc = nvc.presentationController;
        pc.delegate = self;
    }
}

#pragma mark == UIPopoverPresentationControllerDelegate ==
- (UIModalPresentationStyle)adaptivePresentationStyleForPresentationController:(UIPresentationController *)controller
{
    return UIModalPresentationNone;
}

在 WWDC 2014 “View Controller Advancements in iOS8”中，以下代码可以在 iPhone 上显示弹出框。

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{

    UINavigationController * nvc = segue.destinationViewController;
    UIPopoverPresentationController * pvc = nvc.popoverPresentationController;
    pvc.delegate = self;
}

#pragma mark == UIPopoverPresentationControllerDelegate ==
- (UIModalPresentationStyle)adaptivePresentationStyleForPresentationController:(UIPresentationController *)controller
{
    return UIModalPresentationNone;
}

但在 Xcode 6.1 上，这些代码显示全屏演示... （nvc.popoverPresentationController 为零）

我怀疑这可能是 Apple 的错误。

Answer 6

在 iOS 8.3 及更高版本中，在UIPopoverPresentationControllerDelegate 协议中使用以下语法来覆盖弹出窗口的UIModalPresentationStyle。

func adaptivePresentationStyle(for controller: UIPresentationController) -> UIModalPresentationStyle {
    return .none
}

Answer 7

在您的 WEBVIEW 类中添加这两个方法。并添加

-(void) prepareForSegue: (UIStoryboardSegue * ) segue sender: (id) sender {
    // Assuming you've hooked this all up in a Storyboard with a popover presentation style
    if ([segue.identifier isEqualToString: @"showPopover"]) {
        UINavigationController * destNav = segue.destinationViewController;
        pop = destNav.viewControllers.firstObject;
        // This is the important part
        UIPopoverPresentationController * popPC = destNav.popoverPresentationController;
        popPC.delegate = self;
    }
}

- (UIModalPresentationStyle) adaptivePresentationStyleForPresentationController: (UIPresentationController * ) controller {
    return UIModalPresentationNone;
}

Answer 8

您可以像这样扩展 UIPopoverPresentationControllerDelegate：

protocol PopoverPresentationSourceView {}
extension UIBarButtonItem : PopoverPresentationSourceView {}
extension UIView : PopoverPresentationSourceView {}

extension UIPopoverPresentationControllerDelegate where Self : UIViewController {
   func present(popover: UIViewController, 
        from sourceView: PopoverPresentationSourceView, 
        size: CGSize, arrowDirection: UIPopoverArrowDirection) {

      popover.modalPresentationStyle = .popover
      popover.preferredContentSize = size
      let popoverController = popover.popoverPresentationController
      popoverController?.delegate = self
      if let aView = sourceView as? UIView {
          popoverController?.sourceView = aView
          popoverController?.sourceRect = CGRect(x: aView.bounds.midX, y: aView.bounds.midY, width: 0, height: 0)
      } else if let barButtonItem = sourceView as? UIBarButtonItem {
          popoverController?.barButtonItem = barButtonItem
      }
      popoverController?.permittedArrowDirections = arrowDirection
      present(popover, animated: true, completion: nil)
   }
}

您现在可以从任何实现UIPopoverPresentationControllerDelegate 的视图控制器调用present(popover: from: size: arrowDirection: )，例如。

class YourViewController : UIViewController {
    @IBAction func someButtonPressed(_ sender: UIButton) {
        let popover = SomeViewController()
        present(popover: popover, from: sender, size: CGSize(width: 280, height: 400), arrowDirection: .right)
    }
}

extension YourViewController : UIPopoverPresentationControllerDelegate {
    func adaptivePresentationStyle(for controller: UIPresentationController) -> UIModalPresentationStyle {
        return .none
    }
}