How to make UIPopoverController keep same position

问题:

I can't keep popover the same position on the screen after rotation. Is there any good way to do that, because just setting some frame to popover works terrible after rotating.popover.frame = CGRectMake(someFrame); After rotation popover looks fine only if it is in the center of the screen.

回答1:

Apple has a Q&A on exactly this issue. You can find the details here:

Technical Q&A QA1694 Handling Popover Controllers During Orientation Changes

Basically, the technique explains that in your view controller's didRotateFromInterfaceOrientation method, you will present the pop over again as follows:

- (void)didRotateFromInterfaceOrientation:(UIInterfaceOrientation)fromInterfaceOrientation
{
    [aPopover presentPopoverFromRect:targetRect.frame inView:self.view permittedArrowDirections:UIPopoverArrowDirectionAny animated:YES];
}

For more information, have a read of the article above, and also the UIPopoverController Class Reference:

If the user rotates the device while a popover is visible, the popover controller hides the popover and then shows it again at the end of the rotation. The popover controller attempts to position the popover appropriately for you but you may have to present it again or hide it altogether in some cases. For example, when displayed from a bar button item, the popover controller automatically adjusts the position (and potentially the size) of the popover to account for changes to the position of the bar button item. However, if you remove the bar button item during the rotation, or if you presented the popover from a target rectangle in a view, the popover controller does not attempt to reposition the popover. In those cases, you must manually hide the popover or present it again from an appropriate new position. You can do this in the didRotateFromInterfaceOrientation: method of the view controller that you used to present the popover.

回答2:

As of iOS 8.0.2 willRotateToInterfaceOrientation will not have any effect. As mhrrt mentioned, you need to use the delegate method:

- (void)popoverController:(UIPopoverController *)popoverController willRepositionPopoverToRect:(inout CGRect *)rect inView:(inout UIView *__autoreleasing *)view

So for example if you want your popover to appear directly below a button that was pressed, you would use the following code:

- (void)popoverController:(UIPopoverController *)popoverController willRepositionPopoverToRect:(inout CGRect *)rect inView:(inout UIView *__autoreleasing *)view
{
   CGRect rectInView = [self.theButton convertRect:self.theButton.frame toView:self.view];
   *rect = CGRectMake(CGRectGetMidX(rectInView), CGRectGetMaxY(rectInView), 1, 1);
   *view = self.view;
}

回答3:

In iOS 7 you can use - (void)popoverController:(UIPopoverController *)popoverController willRepositionPopoverToRect:(inout CGRect *)rect inView:(inout UIView *__autoreleasing *)view to reposition your UIPopoverController's view on interface orientation change.

See the UIPopoverControllerDelegate documentation.

回答4:

You can do this in didRotateFromInterfaceOrientation: method of the view controller that you used to present the popover.

Use setPopoverContentSize:animated: method for setting the size of the popover.

回答5:

UIPopoverController was deprecated in ios9 in favor of UIPopoverPresentationController introduced in ios8. (I went through this transition also when going from UIActionSheet to UIAlertController.) You have two choices (example in obj-C):

A. Implement the UIViewController method below (UIKit calls this method before changing the size of a presented view controller’s view).

- (void)viewWillTransitionToSize:(CGSize)size
           withTransitionCoordinator:(id<UIViewControllerTransitionCoordinator>)coordinator {
        [super viewWillTransitionToSize:size withTransitionCoordinator:coordinator];
        [coordinator animateAlongsideTransition:nil
                                     completion:^(id<UIViewControllerTransitionCoordinatorContext> _Nonnull context) {
                                         // Fix up popover placement if necessary, *after* the transition.
                                         // Be careful here if a subclass also overrides this method.
                                         if (self.presentedViewController) {
                                             UIPopoverPresentationController *presentationController =
                                                     [self.presentedViewController popoverPresentationController];
                                             UIView *selectedView = /** YOUR VIEW */;
                                             presentationController.sourceView = selectedView.superview;
                                             presentationController.sourceRect = selectedView.frame;
                                         }
                                     }];
    }

B. Alternatively, when configuring your UIPopoverPresentationController to present, also set its delegate. e.g. your presenting vc can implement UIPopoverPresentationControllerDelegate and assign itself as the delegate. Then implement the delegate method:

- (void)popoverPresentationController:(UIPopoverPresentationController *)popoverPresentationController
          willRepositionPopoverToRect:(inout CGRect *)rect
                               inView:(inout UIView * _Nonnull *)view {
    UIView *selectedView = /** YOUR VIEW */;
    // Update where the arrow pops out of in the view you selected.
    *view = selectedView;
    *rect = selectedView.bounds;
}

回答6:

I've tried just to set new rect (rect.initialize(...)) and it works.

func popoverPresentationController(popoverPresentationController: UIPopoverPresentationController, willRepositionPopoverToRect rect: UnsafeMutablePointer<CGRect>, inView view: AutoreleasingUnsafeMutablePointer<UIView?>) {

        if popoverPresentationController.presentedViewController.view.tag == Globals.PopoverTempTag
        {
            rect.initialize(getForPopupSourceRect())
        }
    }

回答7:

For Swift:

func popoverPresentationController(_ popoverPresentationController: UIPopoverPresentationController, willRepositionPopoverTo rect: UnsafeMutablePointer<CGRect>, in view: AutoreleasingUnsafeMutablePointer<UIView>)
{
    rect.pointee = CGRect(x: self.view.frame.size.width, y: 0, width: 1, height: 1) // Set new rect here
}

回答8:

I have similar problem which I resolve by this

[myPop presentPopoverFromRect:myfield.frame inView:myscrollview permittedArrowDirections:UIPopoverArrowDirectionAny animated:YES];

Where myfield is frame from which you want to show your popover and myscrollview is container view in which you add your popover as subview(in my case its my scrollview, instead of putting inView:self.view I use inView:myscrollview).

回答9:

1. Initialize PopOver Controller

   var popoverContent: PopoverContentViewController?
   

2. Write Defination for PopOver Controller

   popoverContent = self.storyboard?.instantiateViewController(withIdentifier: "PopoverContentViewController") as? PopoverContentViewController
   popoverContent?.modalPresentationStyle = .popover
   let popover = popoverContent?.popoverPresentationController!
   popover?.delegate = self
   popoverContent?.preQuestionInfoPopUpViewDelegateObject = self
   popover?.permittedArrowDirections = UIPopoverArrowDirection()
   popover?.sourceView = self.view
   popover?.sourceRect = CGRect(x: self.view.bounds.midX, y: self.view.bounds.midY, width: 330, height: 330)
   

3. Present PopOver Controller

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

4. Write below method and assign new size to popover:

   override func viewWillTransition(to size: CGSize, with coordinator: UIViewControllerTransitionCoordinator) { let popover = popoverContent?.popoverPresentationController! popover?.sourceRect = CGRect(x: size.width/2, y: size.height/2, width: 0, height: 0) }

回答10:

I had a same problem. Instead of performing -presentPopoverFromRect each time by keeping track of the source rectangle / view from which it is presented, I subclassed UIPopoverController. After doing it, all you have to do is set either the UIBarButtonItem / UIView from where the popover has to be displayed. You can even opt for displaying the popover from custom frame which can be passed in as a NSString value.

CSPopoverController.h:

#import <UIKit/UIKit.h>

// The original popover controller would not re-orientate itself when the orientation change occurs. To tackle that issue, this subclass is created
@interface CSPopoverController : UIPopoverController

@property (nonatomic, strong) NSString *popoverDisplaySourceFrame;  // Mutually Exclusive. If you want to set custom rect as source, make sure that popOverDisplaySource is nil
@property (nonatomic, strong) id popoverDisplaySource;              // Mutually exclusive. If UIBarButtonItem is set to it, popoverDisplaySourceFrame is neglected.
@property (nonatomic, strong) UIView *popoverDisplayView;

@property (nonatomic, assign, getter = shouldAutomaticallyReorientate) BOOL automaticallyReorientate;

-(void)reorientatePopover;

@end

CSPopoverController.m:

#import "CSPopoverController.h"

@implementation CSPopoverController
@synthesize popoverDisplaySourceFrame = popoverDisplaySourceFrame_;
-(NSString*)popoverDisplaySourceFrame
{
    if (nil==popoverDisplaySourceFrame_)
    {
        if (nil!=self.popoverDisplaySource)
        {
            if ([self.popoverDisplaySource isKindOfClass:[UIView class]])
            {
                UIView *viewSource = (UIView*)self.popoverDisplaySource;
                [self setPopoverDisplaySourceFrame:NSStringFromCGRect(viewSource.frame)];
            }
        }
    }
    return popoverDisplaySourceFrame_;
}
-(void)setPopoverDisplaySourceFrame:(NSString *)inPopoverDisplaySourceFrame
{
    if (inPopoverDisplaySourceFrame!=popoverDisplaySourceFrame_)
    {
        popoverDisplaySourceFrame_ = inPopoverDisplaySourceFrame;
        [self reorientatePopover];
    }
}
@synthesize popoverDisplaySource = popoverDisplaySource_;
-(void)setPopoverDisplaySource:(id)inPopoverDisplaySource
{
    if (inPopoverDisplaySource!=popoverDisplaySource_)
    {
        [self unlistenForFrameChangeInView:popoverDisplaySource_];
        popoverDisplaySource_ = inPopoverDisplaySource;
        [self reorientatePopover];

        if ([popoverDisplaySource_ isKindOfClass:[UIView class]])
        {
            UIView *viewSource = (UIView*)popoverDisplaySource_;
            [self setPopoverDisplaySourceFrame:NSStringFromCGRect(viewSource.frame)];
        }
        if (self.shouldAutomaticallyReorientate)
        {
            [self listenForFrameChangeInView:popoverDisplaySource_];
        }
    }
}
@synthesize popoverDisplayView = popoverDisplayView_;
-(void)setPopoverDisplayView:(UIView *)inPopoverDisplayView
{
    if (inPopoverDisplayView!=popoverDisplayView_)
    {
        popoverDisplayView_ = inPopoverDisplayView;
        [self reorientatePopover];
    }
}
@synthesize automaticallyReorientate = automaticallyReorientate_;
-(void)setAutomaticallyReorientate:(BOOL)inAutomaticallyReorientate
{
    if (inAutomaticallyReorientate!=automaticallyReorientate_)
    {
        automaticallyReorientate_ = inAutomaticallyReorientate;
        if (automaticallyReorientate_)
        {
            [self listenForAutorotation];
            [self listenForFrameChangeInView:self.popoverDisplaySource];
        }
        else
        {
            [self unlistenForAutorotation];
            [self unlistenForFrameChangeInView:self.popoverDisplaySource];
        }
    }
}

-(void)listenForAutorotation
{
    [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(orientationChanged:)
                                                 name:UIDeviceOrientationDidChangeNotification
                                               object:nil];
}

-(void)unlistenForAutorotation
{
    [[NSNotificationCenter defaultCenter] removeObserver:self
                                                    name:UIDeviceOrientationDidChangeNotification
                                                  object:nil];
}

-(void)listenForFrameChangeInView:(id)inView
{
    // Let's listen for changes in the view's frame and adjust the popover even if the frame is updated
    if ([inView isKindOfClass:[UIView class]])
    {
        UIView *viewToObserve = (UIView*)inView;
        [viewToObserve addObserver:self
                        forKeyPath:@"frame"
                           options:NSKeyValueObservingOptionNew
                           context:nil];
    }
}

-(void)unlistenForFrameChangeInView:(id)inView
{
    if ([inView isKindOfClass:[UIView class]])
    {
        UIView *viewToObserve = (UIView*)inView;
        [viewToObserve removeObserver:self
                           forKeyPath:@"frame"];
    }
}

// TODO: Dealloc is not called, check why? !!!
- (void)dealloc
{
    [self unlistenForFrameChangeInView:self.popoverDisplaySource];
    [self unlistenForAutorotation];
    DEBUGLog(@"dealloc called for CSPopoverController %@", self);
}

#pragma mark - Designated initializers
-(id)initWithContentViewController:(UIViewController *)viewController
{
    self = [super initWithContentViewController:viewController];
    if (self)
    {
        [self popoverCommonInitializations];
    }
    return self;
}

-(void)popoverCommonInitializations
{
    [self setAutomaticallyReorientate:YES];
}

#pragma mark - Frame
-(void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context
{
    if (object==self.popoverDisplaySource)
    {
        [self setPopoverDisplaySourceFrame:nil];
        [self reorientatePopover];
    }
}

#pragma mark - Orientation
-(void)orientationChanged:(NSNotification *)inNotification
{
    [self reorientatePopover];
}

-(void)reorientatePopover
{
    [NSObject cancelPreviousPerformRequestsWithTarget:self
                                             selector:@selector(performReorientatePopover)
                                               object:nil];
//    if ([self isPopoverVisible])
    {
        [self performSelector:@selector(performReorientatePopover)
                   withObject:nil
                   afterDelay:0.0];
    }
}

-(void)performReorientatePopover
{
    if (self.popoverDisplaySourceFrame && self.popoverDisplayView)
    {
        [self presentPopoverFromRect:CGRectFromString(self.popoverDisplaySourceFrame)
                              inView:self.popoverDisplayView
            permittedArrowDirections:UIPopoverArrowDirectionAny
                            animated:YES];
    }
    else if (self.popoverDisplaySource && [self.popoverDisplaySource isKindOfClass:[UIBarButtonItem class]])
    {
        UIBarButtonItem *barButton = (UIBarButtonItem*)self.popoverDisplaySource;
        [self presentPopoverFromBarButtonItem:barButton
                     permittedArrowDirections:UIPopoverArrowDirectionAny
                                     animated:YES];
    }
}

@end

Usage:

If it is a UIBarButtonItem from where you are presenting it:

CSPopoverController *popOverCont = [[CSPopoverController alloc]initWithContentViewController:navCont];
self.popOver = popOverCont;
[popOverCont setPopoverDisplaySource:self.settingsButtonItem];

If it is a UIView from where you are presenting the popover:

CSPopoverController *popOver = [[CSPopoverController alloc] initWithContentViewController:navigation];
self.iPadPopoverController = popOver;
[newDateVC setIPadPopoverController:self.iPadPopoverController];
[popOver setPopoverDisplaySource:inButton];
[popOver setPopoverDisplayView:inView];

回答11:

For iOS > 8 John Strickers answer helped but didn't do what I wanted it to do.

Here's the solution that worked for me. (If you want to download a full sample project it's here: https://github.com/appteur/uipopoverExample)

I created a property to hold any popover I wanted to present and also added a property to track the sourceRect and another for the view of the button I wanted the popover arrow to point at.

@property (nonatomic, weak) UIView *activePopoverBtn;
@property (nonatomic, strong) PopoverViewController *popoverVC;
@property (nonatomic, assign) CGRect sourceRect; 

The button that triggered my popover is in a UIToolbar. When tapped it runs the following method that creates and launches the popover.

-(void) buttonAction:(id)sender event:(UIEvent*)event
{
    NSLog(@"ButtonAction");

    // when the button is tapped we want to display a popover, so setup all the variables needed and present it here

    // get a reference to which button's view was tapped (this is to get 
    // the frame to update the arrow to later on rotation)
    // since UIBarButtonItems don't have a 'frame' property I found this way is easy
    UIView *buttonView          = [[event.allTouches anyObject] view];

    // set our tracker properties for when the orientation changes (handled in the viewWillTransitionToSize method above)
    self.activePopoverBtn       = buttonView;
    self.sourceRect             = buttonView.frame;

    // get our size, make it adapt based on our view bounds
    CGSize viewSize             = self.view.bounds.size;
    CGSize contentSize          = CGSizeMake(viewSize.width, viewSize.height - 100.0);

    // set our popover view controller property
    self.popoverVC = [[UIStoryboard storyboardWithName:@"Main" bundle:[NSBundle mainBundle]] instantiateViewControllerWithIdentifier:@"PopoverVC"];

    // configure using a convenience method (if you have multiple popovers this makes it faster with less code)
    [self setupPopover:self.popoverVC
        withSourceView:buttonView.superview // this will be the toolbar
            sourceRect:self.sourceRect
           contentSize:contentSize];

    [self presentViewController:self.popoverVC animated:YES completion:nil];

}

The 'setupPopover:withSourceView:sourceRect:contentSize method is simply a convenience method to set the popoverPresentationController properties if you plan to display multiple popovers and want them configured the same. It's implementation is below.

// convenience method in case you want to display multiple popovers
-(void) setupPopover:(UIViewController*)popover withSourceView:(UIView*)sourceView sourceRect:(CGRect)sourceRect contentSize:(CGSize)contentSize
{
    NSLog(@"\npopoverPresentationController: %@\n", popover.popoverPresentationController);

    popover.modalPresentationStyle = UIModalPresentationPopover;
    popover.popoverPresentationController.delegate = self;
    popover.popoverPresentationController.sourceView                = sourceView;
    popover.popoverPresentationController.sourceRect                = sourceRect;
    popover.preferredContentSize                                    = contentSize;
    popover.popoverPresentationController.permittedArrowDirections  = UIPopoverArrowDirectionDown;
    popover.popoverPresentationController.backgroundColor           = [UIColor whiteColor];
}

For iOS 8 and up the viewWillTransitionToSize:withTransitionCoordinator get's called on the view controller when the device rotates.

I implemented this method in my presenting view controller class as shown below.

// called when rotating a device
- (void)viewWillTransitionToSize:(CGSize)size withTransitionCoordinator:(id<UIViewControllerTransitionCoordinator>)coordinator
{
    NSLog(@"viewWillTransitionToSize [%@]", NSStringFromCGSize(size));

    // resizes popover to new size and arrow location on orientation change
    [coordinator animateAlongsideTransition:^(id<UIViewControllerTransitionCoordinatorContext>  _Nonnull context)
    {
        if (self.popoverVC)
        {
            // get the new frame of our button (this is our new source rect)
            CGRect viewframe = self.activePopoverBtn ? self.activePopoverBtn.frame : CGRectZero;

            // update our popover view controller's sourceRect so the arrow will be pointed in the right place
            self.popoverVC.popoverPresentationController.sourceRect = viewframe;

            // update the preferred content size if we want to adapt the size of the popover to fit the new bounds
            self.popoverVC.preferredContentSize = CGSizeMake(self.view.bounds.size.width -20, self.view.bounds.size.height - 100);
        }

    } completion:^(id<UIViewControllerTransitionCoordinatorContext>  _Nonnull context) {
        // anything you want to do when the transition completes
    }];
}

回答12:

Swift 3:

    class MyClass: UIViewController, UIPopoverPresentationControllerDelegate {


        ...

        var popover:UIPopoverPresentationController?

        ...

        // Where you want to set the popover...
        popover = YourViewController?.popoverPresentationController
        popover?.sourceRect = CGRect(x: self.view.bounds.midX, y: self.view.bounds.midY, width: 0, height: 0)
        popover?.delegate = self

        ...

        // override didRotate...
        override func didRotate(from fromInterfaceOrientation: UIInterfaceOrientation) {
          popover?.sourceRect = CGRect(x: self.view.bounds.midX, y: self.view.bounds.midY, width: 0, height: 0)
        }

}

回答13:

I have popoverPresentationController that I present on a view that has a "fake" nav bar. So I can't attach the popoverPresentationController to a barButtonItem. My popup appears in the right place but does not when the screen rotates.

So for some reason popoverPresentationController(_ popoverPresentationController: UIPopoverPresentationController, willRepositionPopoverTo rect: UnsafeMutablePointer<CGRect>, in view: AutoreleasingUnsafeMutablePointer<UIView>) does not get called for me.

To work around this (iOS 12, Swift 4.2) I added constraints to the popup in the completion closure when calling present. Now my popup stays where I would expect it too.

                present(viewController, animated: true) { [weak self] in
            DDLogDebug(String(describing: viewController.view.frame))
            if let containerView = viewController.popoverPresentationController?.containerView,
            let presentedView = viewController.popoverPresentationController?.presentedView,
            let imageView = self?.headerView.settingsButton {
                withExtendedLifetime(self) {
                    let deltaY:CGFloat = presentedView.frame.origin.y - imageView.frame.maxY
                    let topConstraint = NSLayoutConstraint.init(item: presentedView, attribute: .top, relatedBy: .equal, toItem: imageView.imageView, attribute: .bottom, multiplier: 1, constant: deltaY)
                    topConstraint?.priority = UILayoutPriority(rawValue: 999)
                    topConstraint?.isActive = true
                    let heightContraint = NSLayoutConstraint.init(item: presentedView, attribute: .height, relatedBy: .equal, toItem: containerView, attribute: .height, multiplier: 0.75, constant: -deltaY)
                    heightContraint?.isActive = true
                    let leftConstraint = NSLayoutConstraint.init(item: presentedView, attribute: .left, relatedBy: .equal, toItem: containerView, attribute: .left, multiplier: 1, constant: presentedView.frame.origin.x)
                    leftConstraint.isActive = true
                    let widthConstraint = NSLayoutConstraint.init(item: presentedView, attribute: .width, relatedBy: .equal, toItem: nil, attribute: .notAnAttribute, multiplier: 1, constant: presentedView.frame.width)
                    widthConstraint.isActive = true
                    presentedView.translatesAutoresizingMaskIntoConstraints = false
                }
            }
        }