iOS 11 多任务模式下的弹出框演示问题

Question

保持弹出框处于打开状态。然后，当我尝试切换到 2/3 屏幕模式并在 viewWillTrainsition 中使用固定空间 BarButtonItem 更改中心 BarButtonItem 的位置时，我的弹出框工具提示将移动到 barButtonItem 的上一个位置。

- (void)viewWillTransitionToSize:(CGSize)size withTransitionCoordinator:(id<UIViewControllerTransitionCoordinator>)coordinator {
[super viewWillTransitionToSize:size withTransitionCoordinator:coordinator];
[coordinator animateAlongsideTransition:^(id<UIViewControllerTransitionCoordinatorContext>  _Nonnull context) {
    if (size.width>size.height) {
        _fixedSpace.width = 280;
    } else {
        _fixedSpace.width = 80;
    }
} completion:^(id<UIViewControllerTransitionCoordinatorContext>  _Nonnull context) {

}];}

Answer 1

从 iOS11 开始，条形按钮项使用约束而不是框架。因此，请尝试对每个条形按钮项进行约束。它可能不会从视觉上反映出来，但它在产生此类问题时起着重要作用。

尝试使用以下代码设置约束：

if #available(iOS 11.0, *)
{
  _fixedSpace.widthAnchor.constraint(equalToConstant: 280.0).isActive = true
}

希望这会有所帮助！

Answer 2

我复制了相同的场景，并找到了解决方法，如下所示：

[coordinator animateAlongsideTransition:^(id<UIViewControllerTransitionCoordinatorContext>  _Nonnull context) {
    if (size.width > size.height) {
        fixedSpace.width = 280;
    } else {
        fixedSpace.width = 80;
    }
} completion:^(id<UIViewControllerTransitionCoordinatorContext>  _Nonnull context) {
    CGRect rect = [self.view convertRect:barBtn.frame fromView:barBtn];
    popover.sourceRect = rect;
}];

尝试在完成块中重置 sourceRect 属性。

希望对您有所帮助！

Answer 3

据我了解您的问题，我想为此提出一个简单的解决方案：

我在情节提要中使用了 Viewcontroller 和 PopoverView。 Viewcontroller 将作为主视图控制器工作，而 PopoverView 将作为弹出窗口显示。 （注意：不要忘记在 StoryBoard 中为 PopoverView 设置显式内容大小）以获取更多参考，您可以查看我的故事板的附加屏幕截图。

这里是 Viewcontroller 的示例源代码，您会发现 Popoverview 的位置会随着右键框架的变化而变化。

此代码是使用 Objective C

开发的

ViewController.h

    //
    //  ViewController.h
    //  SOPopoverControllerDemo
    //
    //  Created by Test User on 08/01/18.
    //  Copyright © 2018 Test User All rights reserved.
    //

    #import <UIKit/UIKit.h>

    @interface ViewController : UIViewController


    @end

ViewController.m

    //
    //  ViewController.m
    //  SOPopoverControllerDemo
    //
    //  Created by Test User on 08/01/18.
    //  Copyright © 2018 Test User All rights reserved.
    //

    #import "ViewController.h"

    @interface ViewController () <UIPopoverPresentationControllerDelegate>

    @property (weak, nonatomic) IBOutlet UIBarButtonItem *leftToolBarBtn;
    @property (weak, nonatomic) IBOutlet UIBarButtonItem *rightToolBarBtn;
    @property (weak, nonatomic) IBOutlet UIBarButtonItem *flexibleBtn;
    @property (weak, nonatomic) IBOutlet UIToolbar *bottomToolBar;
    @property (weak,nonatomic) UIPopoverPresentationController *popOverController;


    @end



    @implementation ViewController

    - (void)viewDidLoad {
        [super viewDidLoad];
        // Do any additional setup after loading the view, typically from a nib.

        if (self.view.frame.size.width > self.view.frame.size.height) {
            self.rightToolBarBtn.width = 200;
            self.leftToolBarBtn.width = 200;
        } else {
            self.rightToolBarBtn.width = 150;
            self.leftToolBarBtn.width = 150;
        }

    }

    - (void) viewWillTransitionToSize:(CGSize)size withTransitionCoordinator:(id<UIViewControllerTransitionCoordinator>)coordinator {
        [super viewWillTransitionToSize:size withTransitionCoordinator:coordinator];
        [coordinator animateAlongsideTransition:^(id<UIViewControllerTransitionCoordinatorContext>  _Nonnull context) {
            if (size.width > size.height) {
                _rightToolBarBtn.width = 200;
                [self dismissViewControllerAnimated:true completion:nil];
                [self rightToolBarBtnTapped:_rightToolBarBtn];
            } else {
                _rightToolBarBtn.width = 150;
                [self dismissViewControllerAnimated:true completion:nil];
                [self rightToolBarBtnTapped:_rightToolBarBtn];
            }
        } completion:^(id<UIViewControllerTransitionCoordinatorContext>  _Nonnull context) {

        }];
    }

    - (IBAction)rightToolBarBtnTapped:(id)sender {


        //Grab the controller for popover
        UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"Main" bundle:nil];
        UIViewController *controller = [storyboard instantiateViewControllerWithIdentifier:@"PopoverView"];

        if (self.view.frame.size.width > self.view.frame.size.height ) {
            controller.preferredContentSize = CGSizeMake(200, 100);
        } else {
            controller.preferredContentSize = CGSizeMake(150, 100);
        }


        controller.modalPresentationStyle = UIModalPresentationPopover;
        [self presentViewController:controller animated:YES completion:nil];

        // configure the Popover presentation controller
        _popOverController = [controller popoverPresentationController];
        _popOverController.delegate = self;
        _popOverController.permittedArrowDirections = UIPopoverArrowDirectionUp;
        _popOverController.barButtonItem = self.rightToolBarBtn;

        }


    //--------------------------------------------------
    #pragma mark ->  UIPopOverController Delegate
    //--------------------------------------------------

    - (BOOL)popoverPresentationControllerShouldDismissPopover:(UIPopoverPresentationController *)popoverPresentationController {
        return YES;
    }

    - (void)popoverPresentationControllerDidDismissPopover:(UIPopoverPresentationController *)popoverPresentationController {
        NSLog(@"Popover Did Dismissed");
    }


    @end

PopoverView.h

    //
    //  PopoverView.h
    //  SOPopoverControllerDemo
    //
    //  Created by Test User on 08/01/18.
    //  Copyright © 2018 Test User All rights reserved.
    //

    #import <UIKit/UIKit.h>

    @interface PopoverView : UIViewController

    @end

PopoverView.m

    //
    //  PopoverView.m
    //  SOPopoverControllerDemo
    //
    //  Created by Test User on 08/01/18.
    //  Copyright © 2018 Test User All rights reserved.
    //

    #import "PopoverView.h"

    @interface PopoverView ()

    @end

    @implementation PopoverView

    - (void)viewDidLoad {
        [super viewDidLoad];
        // Do any additional setup after loading the view.
    }

    - (void)didReceiveMemoryWarning {
        [super didReceiveMemoryWarning];
        // Dispose of any resources that can be recreated.
    }

    @end