如何中心在迅速一popoverview

Question

我有以下代码显示无箭，其中工程罚款popoverview（对话）。唯一的问题是，该对话框中左上方总览所示。我想中心屏幕上的视图。

是什么改变或添加在我下面的代码？ ：

func show_help(){


    let storyboard = UIStoryboard(name: "Main", bundle: nil)
    let controller = storyboard.instantiateViewControllerWithIdentifier("Help") as! UIViewController

    controller.modalPresentationStyle = UIModalPresentationStyle.popover

    let popoverPresentationController = controller.popoverPresentationController

    // result is an optional (but should not be nil if modalPresentationStyle is popover)
    if let _popoverPresentationController = popoverPresentationController {

        // set the view from which to pop up
        _popoverPresentationController.sourceView = self.view;
        _popoverPresentationController.permittedArrowDirections = UIPopoverArrowDirection.allZeros;
        // present (id iPhone it is a modal automatic full screen)
        self.presentViewController(controller, animated: true, completion: nil)
    }

}

其他相关信息

我认为，这是与我的ViewController予设定的优选尺寸是这样的：

override func viewDidLoad() {
        let dialogheigth:CGFloat = self.view.frame.height * 0.5;
        let dialogwidth:CGFloat = self.view.frame.width * 0.5;
        self.preferredContentSize = CGSizeMake(dialogwidth,dialogheigth);
}

Answer 1

您需要提供的酥料饼的源rect。

从苹果文件：源rect处于其中锚定酥料饼的指定视图的矩形。使用结合此属性与sourceView属性来指定酥料饼的锚位置。

在你的情况下，下

_popoverPresentationController.sourceView = self.view;

加：

_popoverPresentationController.sourceRect = CGRectMake(CGRectGetMidX(self.view.bounds), CGRectGetMidY(self.view.bounds),0,0)

它会做的伎俩！

Answer 2

添加的代码下面提到线，使其中心。

popoverController.popoverPresentationController?.sourceView = view

popoverController.popoverPresentationController?.sourceRect = view.bounds

Answer 3

下面是使用斯威夫特3的实现

let popover = storyboard?.instantiateViewController(withIdentifier: "popover") as! PopoverVC

    popover.modalPresentationStyle = UIModalPresentationStyle.popover
    popover.popoverPresentationController?.backgroundColor = UIColor.green
    popover.popoverPresentationController?.delegate = self

    popover.popoverPresentationController?.sourceView = self.view
    popover.popoverPresentationController?.sourceRect = CGRect(x: self.view.bounds.midX, y: self.view.bounds.midY, width: 0, height: 0)

    popover.popoverPresentationController?.permittedArrowDirections = UIPopoverArrowDirection(rawValue: 0)

    self.present(popover, animated: true)

基于伊什特万的answer

Answer 4

斯威夫特4实施：

popover.popoverPresentationController?.sourceRect = CGRect(x: view.center.x, y: view.center.y, width: 0, height: 0)
popover.popoverPresentationController?.sourceView = view
popover.popoverPresentationController?.permittedArrowDirections = UIPopoverArrowDirection(rawValue: 0)

Answer 5

对于夫特3（Xcode中8，iOS装置9）的另一种方法是这样的：

从什么地方叫做：

self.performSegue(withIdentifier: "showPopupSegue", sender: yourButton)

这被SEGUE之前调用的函数被炒鱿鱼：

override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
    if let popoverPresentationController = segue.destination.popoverPresentationController {
        let controller = popoverPresentationController
        controller.permittedArrowDirections = UIPopoverArrowDirection(rawValue: 0)
        controller.sourceView = self.view
        controller.sourceRect = CGRect(x: UIScreen.main.bounds.width * 0.5 - 200, y: UIScreen.main.bounds.height * 0.5 - 100, width: 400, height: 200)
        segue.destination.preferredContentSize=CGSize(width: 400, height: 200)
    }
}

记住故事板SEGUE的类属性为“表现为酥料饼”和锚属性设置为以前的视图控制器的任何视图。

Answer 6

基本上包括三个步骤（iOS的8）：

1.-目前认为：

比方说，你要显示的自定义视图，要求评论的用户。这里loadNibForRate()返回从笔尖加载RateDialog实例的功能，但你可以在这里使用您希望找到您UIViewController任何方式

private static func presentCustomDialog(parent: RateDialogParent) -> Bool {
    /// Loads the rateDialog from its xib, handled this way for further customization if desired
      if let rateDialog = loadNibForRate() {
        rateDialog.modalPresentationStyle = UIModalPresentationStyle.Popover
        rateDialog.modalTransitionStyle = UIModalTransitionStyle.CrossDissolve
        let x = parent.view.center

        let sourceRectX : CGFloat
        //Here we check for the orientation of the device, just to know if we are on an iPad
        let maximumDim = max(UIScreen.mainScreen().bounds.height, UIScreen.mainScreen().bounds.width)
        if maximumDim == 1024 { //iPad
            sourceRectX = x.x
        }else {
            sourceRectX = 0
        }

        rateDialog.popoverPresentationController?.sourceView = parent.view
        rateDialog.popoverPresentationController?.permittedArrowDirections = UIPopoverArrowDirection.allZeros
        rateDialog.popoverPresentationController?.sourceRect = CGRectMake(sourceRectX, x.y, 0, 0)
        rateDialog.popoverPresentationController?.popoverLayoutMargins = UIEdgeInsetsMake(0, 0, 0, 0)
        rateDialog.popoverPresentationController?.delegate = parent

        rateDialogParent = parent

        callFunctionAsync() {
            parent.presentViewController(rateDialog, animated: true, completion: nil)
        }
        return true
    }
    return false
}

2：如果我们旋转我们的设备，那么酥料饼不知道往哪里祭出，除非我们有这个父RateDialogParent

public class RateDialogParent: UIViewController, UIPopoverPresentationControllerDelegate {
/**
This function guarantees that the RateDialog is alwas centered at parent, it locates the RateDialog's view by searching for its tag (-555)
 */
 public func popoverPresentationController(popoverPresentationController: UIPopoverPresentationController, willRepositionPopoverToRect rect: UnsafeMutablePointer<CGRect>, inView view: AutoreleasingUnsafeMutablePointer<UIView?>) {
    if popoverPresentationController.presentedViewController.view.tag == RateDialog.thisViewTag {
        let x = popoverPresentationController.presentingViewController.view.center
        let newRect = CGRectMake(x.x, x.y, 0, 0)
        rect.initialize(newRect)
    }
 }
}

3.-你RateDialog应该有一个标签设置好的，这只是为了避免不必要的重新定位，如果popovers有更多的从你的RateDialogParent呈现一个

class RateDialog: UIViewController {
 @IBOutlet weak var reviewTitle: UILabel!
 @IBOutlet weak var reviewMessage : UILabel!
 @IBOutlet weak var cancelButtonTitle: UIButton!
 @IBOutlet weak var remindButtonTitle : UIButton!
 @IBOutlet weak var rateButtonTitle : UIButton!

    /// For being able to locate this view
 static let thisViewTag = -555

 override func viewDidLoad() {
    super.viewDidLoad()
    //sets the tag to identify this view
    self.view.tag = RateDialog.thisViewTag
 }
}

Answer 7

斯威夫特4实施中心酥料饼控制器

let navigationController = UINavigationController(rootViewController: controller)

 navigationController.modalPresentationStyle = .popover      
 navigationController.modalPresentationStyle = UIModalPresentationStyle.popover
 let popover = navigationController.popoverPresentationController
 controller.preferredContentSize = CGSize(width:500,height:600) //manage according to Device like iPad/iPhone
 popover?.delegate = self
 popover?.sourceView = self.view
 popover?.sourceRect = CGRect(x: view.center.x, y: view.     .y, width: 0, height: 0)
 popover?.permittedArrowDirections = UIPopoverArrowDirection(rawValue: 0)

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

Answer 8

在iOS8上，你并不需要使用self.view.frame计算宽度和高度。

您可以在对话框的高度和宽度使用方式如下：

override func viewDidLoad() {
     var frameSize: CGPoint = CGPointMake(UIScreen.mainScreen().bounds.size.width*0.5, UIScreen.mainScreen().bounds.size.height*0.5)
     self.preferredContentSize = CGSizeMake(frameSize.x,frameSize.y);
}

编辑：

您还可以设置contentSizeForViewInPopover如下太：

self.contentSizeForViewInPopover = CGSizeMake(320.0, 360.0)

让我知道，这有助于与否？

Answer 9

在情况下，如果有帮助的人，我已经创建了一个的UIViewController延长

extension UIViewController{
    func configureAsPopoverAndPosition(withWidthRatio widthRatio:CGFloat,
                                       heightRatio:CGFloat){
        modalPresentationStyle = .popover
        let screenWidth = UIScreen.main.bounds.width
        let screenHeight = UIScreen.main.bounds.height
        let popover = popoverPresentationController
        popover?.sourceView = self.view

        popover?.permittedArrowDirections = [UIPopoverArrowDirection(rawValue: 0)]
        preferredContentSize = CGSize(width: (screenWidth * widthRatio),
                                      height: (screenHeight * heightRatio))

        popover?.sourceRect = CGRect(x: view.center.x,
                                     y: view.center.y,
                                     width: 0,
                                     height: 0)
    }
}

用法：

if UIDevice.current.userInterfaceIdiom == .pad{
                    yourViewController.configureAsPopoverAndPosition(withWidthRatio: 0.7 /*Make view controller width 70 % of screen width*/,
                                                                        heightRatio: 0.7/*Make view controller height 70 % of screen height*/)
                }

这将显示在屏幕中央的酥料饼。

Answer 10

雨燕4.1

下面是简单的解决方案：

乘坐公共变量var popover

var popover: UIPopoverPresentationController?

目前YourViewController如酥料饼，用popover?.sourceRect如下所述。

let storyboard: UIStoryboard = UIStoryboard(name: "YOUR_STORYBOARD", bundle: nil)
let vc = storyboard.instantiateViewController(withIdentifier: "YOUR_IDENTIFIER") as! YourViewController
let navController = UINavigationController(rootViewController: vc)
navController.modalPresentationStyle = UIModalPresentationStyle.popover
popover = yourController.popoverPresentationController!
popover?.sourceRect = CGRect(x: UIScreen.main.bounds.midX, y: UIScreen.main.bounds.midY, width: 0, height: 0)
popover?.sourceView = self.view
popover?.delegate = self
popover?.permittedArrowDirections = UIPopoverArrowDirection(rawValue: 0)
vc.preferredContentSize = CGSize(width: width, height: height)
self.present(navController, animated: true, completion: nil)

使用viewWillTransition的视图过渡风景和肖像。

override func viewWillTransition(to size: CGSize, with coordinator: UIViewControllerTransitionCoordinator) {
     super.viewWillTransition(to: size, with: coordinator)
     popover?.sourceRect = CGRect(x: UIScreen.main.bounds.midX, y: UIScreen.main.bounds.midY, width: 0, height: 0)
}

这会给你酥料饼中心在横向和纵向排列的屏幕。许多灵活的同时使用iPad的拆分视图。