旋转后我不能在屏幕上保持弹出相同的位置。有没有什么好方法可以做到这一点，因为只是将一些框架设置为弹出窗口在旋转后效果很差。popover.frame = CGRectMake(someFrame);旋转后弹出窗口看起来很好，只有它位于屏幕的中心。
答案 0 :(得分：29)
苹果在这个问题上有一个Q＆amp; A.您可以在此处找到详细信息：
Technical Q&A QA1694 Handling Popover Controllers During Orientation Changes
基本上，该技术解释了在视图控制器的didRotateFromInterfaceOrientation方法中，您将再次显示弹出窗口，如下所示：
- (void)didRotateFromInterfaceOrientation:(UIInterfaceOrientation)fromInterfaceOrientation
{
[aPopover presentPopoverFromRect:targetRect.frame inView:self.view permittedArrowDirections:UIPopoverArrowDirectionAny animated:YES];
}
有关详细信息，请阅读上述文章以及UIPopoverController Class Reference：
如果用户在弹出窗口可见时旋转设备，则弹出窗口 控制器隐藏弹出框，然后在结束时再次显示它 回转。弹出控制器尝试定位弹出窗口 适合你，但你可能需要重新呈现或隐藏它 在某些情况下完全一样。例如，从条形图显示时 按钮项，弹出控制器自动调整位置 （以及可能的大小）弹出窗口来考虑更改 条形按钮项的位置。但是，如果您删除栏 旋转期间的按钮项，或者如果您显示了弹出框 视图中的目标矩形，弹出控制器不会尝试 重新定位popover。在这些情况下，您必须手动隐藏 弹出或从适当的新位置再次出现。您可以 在视图的didRotateFromInterfaceOrientation：方法中执行此操作 你用来呈现弹出窗口的控制器。
答案 1 :(得分：16)
从iOS 8.0.2开始，willRotateToInterfaceOrientation 将不会产生任何影响。正如mhrrt所提到的，你需要使用委托方法：
- (void)popoverController:(UIPopoverController *)popoverController willRepositionPopoverToRect:(inout CGRect *)rect inView:(inout UIView *__autoreleasing *)view
因此，例如，如果您希望弹出窗口直接显示在按下的按钮下方，则可以使用以下代码：
- (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;
}
答案 2 :(得分：6)
在iOS 7中，您可以使用- (void)popoverController:(UIPopoverController *)popoverController willRepositionPopoverToRect:(inout CGRect *)rect inView:(inout UIView *__autoreleasing *)view重新定位UIPopoverController的界面方向更改视图。
请参阅UIPopoverControllerDelegate documentation。
答案 3 :(得分：5)
您可以在用于显示弹出窗口的视图控制器的didRotateFromInterfaceOrientation:方法中执行此操作。
使用setPopoverContentSize:animated:方法设置弹出窗口的大小。
答案 4 :(得分：2)
我试过设置新的rect（rect.initialize（...））并且它可以工作。
func popoverPresentationController(popoverPresentationController: UIPopoverPresentationController, willRepositionPopoverToRect rect: UnsafeMutablePointer<CGRect>, inView view: AutoreleasingUnsafeMutablePointer<UIView?>) {
if popoverPresentationController.presentedViewController.view.tag == Globals.PopoverTempTag
{
rect.initialize(getForPopupSourceRect())
}
}
答案 5 :(得分：2)
UIPopoverController，而是支持ios8中引入的UIPopoverPresentationController。 （当我从UIActionSheet转到UIAlertController时，我也经历了这种转变。）你有两个选择（例如obj-C）：
一个。实现下面的UIViewController方法（UIKit在更改显示的视图控制器视图的大小之前调用此方法）。
- (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中。或者，在配置您的UIPopoverPresentationController时，还要设置其委托。例如您的呈现vc可以实现UIPopoverPresentationControllerDelegate并将自己指定为委托。然后实现委托方法：
- (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;
}
答案 6 :(得分：2)
对于Swift：
RangeExpression答案 7 :(得分：1)
我有类似的问题由我解决
[myPop presentPopoverFromRect:myfield.frame inView:myscrollview permittedArrowDirections:UIPopoverArrowDirectionAny animated:YES];
其中myfield是您想要显示您的popover的框架，而myscrollview是容器视图，您将popover添加为子视图（在我的情况下是我的滚动视图，而不是放置{{1}我使用inView:self.view）。
答案 8 :(得分：0)
我遇到了同样的问题。我不是每次都通过跟踪它所呈现的源矩形/视图来执行-presentPopoverFromRect，而是继承UIPopoverController。完成后，您所要做的就是设置UIBarButtonItem / UIView，从那里显示popover。您甚至可以选择显示自定义框架中的弹出窗口，该框架可以作为NSString值传入。
<强> 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
<强> 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
<强>用法：
如果它是您呈现它的UIBarButtonItem：
CSPopoverController *popOverCont = [[CSPopoverController alloc]initWithContentViewController:navCont];
self.popOver = popOverCont;
[popOverCont setPopoverDisplaySource:self.settingsButtonItem];
如果是你出现弹出窗口的UIView：
CSPopoverController *popOver = [[CSPopoverController alloc] initWithContentViewController:navigation];
self.iPadPopoverController = popOver;
[newDateVC setIPadPopoverController:self.iPadPopoverController];
[popOver setPopoverDisplaySource:inButton];
[popOver setPopoverDisplayView:inView];
答案 9 :(得分：0)
适用于iOS＆gt; 8约翰斯特里克斯的答案有所帮助，但没有做我想做的事。
这是适用于我的解决方案。 （如果您想下载完整的示例项目，请点击此处：https://github.com/appteur/uipopoverExample）
我创建了一个属性来保存我想要呈现的任何popover，还添加了一个属性来跟踪sourceRect，另一个属性用于按钮的视图，我希望弹出箭头指向。
@property (nonatomic, weak) UIView *activePopoverBtn;
@property (nonatomic, strong) PopoverViewController *popoverVC;
@property (nonatomic, assign) CGRect sourceRect;
触发弹出窗口的按钮位于UIToolbar中。点按时，它会运行以下创建和启动弹出窗口的方法。
-(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];
}
'setupPopover：withSourceView：sourceRect：contentSize方法只是一个方便的方法来设置popoverPresentationController属性，如果你打算显示多个弹出窗口并希望它们配置相同。它的实现如下。
// 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];
}
对于iOS 8及更高版本，当设备旋转时，viewWillTransitionToSize：withTransitionCoordinator将在视图控制器上调用。
我在演示视图控制器类中实现了这个方法，如下所示。
// 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
}];
}
答案 10 :(得分：0)
斯威夫特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)
}
}
答案 11 :(得分：0)
我在具有“假”导航栏的视图中显示了popoverPresentationController。所以我不能将popoverPresentationController附加到barButtonItem。我的弹出窗口显示在正确的位置，但是当屏幕旋转时不会显示。
因此出于某种原因popoverPresentationController(_ popoverPresentationController: UIPopoverPresentationController, willRepositionPopoverTo rect: UnsafeMutablePointer<CGRect>, in view: AutoreleasingUnsafeMutablePointer<UIView>)并没有被我呼叫。
要解决此问题（iOS 12，Swift 4.2），我在调用present时在完成闭包中的弹出窗口中添加了约束。现在，我的弹出窗口也保持在我期望的位置。
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
}
}
}
答案 12 :(得分：0)
初始化PopOver控制器
var popoverContent: PopoverContentViewController?
为PopOver控制器写定义
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)
当前的PopOver控制器
self.present（popoverContent，动画：true，完成：nil）
编写以下方法，并为弹出框分配新的大小：
重写func viewWillTransition（大小为CGSize，协调器为：UIViewControllerTransitionCoordinator）{ 让popover = popoverContent？.popoverPresentationController！ popover？.sourceRect = CGRect（x：size.width / 2，y：size.height / 2，宽度：0，高度：0） }