Question

我试图使用自定义UIPopoverPresentationController类来显示弹出窗口。但它崩溃了错误(<UIPopoverPresentationController: 0x7a772950>) should have a non-nil sourceView or barButtonItem set before the presentation occurs.下面是我发生崩溃的按钮点击代码。

- (IBAction)showPopup:(UIButton *)sender {
ViewController *contentViewController = [[ViewController alloc] init];

    contentViewController.preferredContentSize = CGSizeMake(200, 200);
    contentViewController.modalPresentationStyle = UIModalPresentationPopover;
    myPopoverController *popOver = [[myPopoverController alloc]initWithPresentedViewController:contentViewController presentingViewController:self andTintColor:[UIColor lightGrayColor]];

    popOver.delegate = self;
    popOver.permittedArrowDirections = UIPopoverArrowDirectionUp;
    popOver.sourceRect = sender.frame;
    popOver.sourceView = self.view;
    [self presentViewController:contentViewController animated: YES completion: nil];
}

以下是我的自定义UIPopoverPresentationController的样子

的示例

myPopoverController.h file

@interface myPopoverController : UIPopoverPresentationController

@property (readonly) UIColor *tintColor;


-(instancetype)initWithPresentedViewController:(UIViewController *)presentedViewController presentingViewController:(UIViewController *)presentingViewController andTintColor:(UIColor *)aTintColor;

@end


myPopoverController.m file

//Some code for UIPopoverBackgroundView

-(instancetype)initWithPresentedViewController:(UIViewController *)presentedViewController presentingViewController:(UIViewController *)presentingViewController
{

    self = [self initWithPresentedViewController:presentedViewController presentingViewController:presentingViewController andTintColor: [UIColor redColor]];

    return self;
}


-(instancetype)initWithPresentedViewController:(UIViewController *)presentedViewController presentingViewController:(UIViewController *)presentingViewController andTintColor:(UIColor *)aTintColor
{

    self = [super initWithPresentedViewController:presentedViewController presentingViewController:presentingViewController];

    if (!self) {
        return nil;
    }

    [super setPopoverBackgroundViewClass: [myPopoverControllerBackgroundView class]];
    tintColor = aTintColor;


    return self;
}

我没有按钮但是我设置了sourceView。我在这里做错了吗？感谢您的帮助

Answer 1

您也可以像这样创建一个弹出式演示控制器，它可以工作

- (IBAction)showPopup:(UIButton *)sender {

ViewController *contentViewController = [[ViewController alloc] init];
    contentViewController.preferredContentSize = CGSizeMake(200, 200);
    contentViewController.modalPresentationStyle = UIModalPresentationPopover;

UIPopoverPresentationController *popoverpresentationController = contentViewController.popoverPresentationController;
    popoverpresentationController.delegate = self;
    popoverpresentationController.permittedArrowDirections = UIPopoverArrowDirectionUp;
    popoverpresentationController.sourceRect = sender.bounds;
    popoverpresentationController.sourceView = sender;
    [self presentViewController:contentViewController animated: YES completion: nil];
}

Answer 2

您正在继承UIPopoverPresentationController，但Apple recommends将它们原样使用。提交UIViewController后，系统会自动创建UIPopoverPresentationController，您应该根据需要对其进行修改。

您创建了一个myPopoverController个实例，但Apple会在您present后contentViewController创建另一个实例：

[self presentViewController:contentViewController animated: YES completion: nil];

这个新UIPopoverPresentationController缺少sourceView并抛出异常。

请尝试以下代码：

ViewController *contentViewController = [[ViewController alloc] init];

// Present the view controller using the popover style.
contentViewController.modalPresentationStyle = UIModalPresentationPopover;
[self presentViewController:contentViewController 
                   animated:YES 
                 completion:nil];

// Get the popover presentation controller and configure it.
UIPopoverPresentationController *presentationController =[contentViewController popoverPresentationController];
presentationController.permittedArrowDirections = UIPopoverArrowDirectionUp;
presentationController.sourceView = sender.frame;
presentationController.sourceRect = self.view;

Answer 3

如果 sourceView 为 null，只需添加验证

UIActivityViewController * avc = [[UIActivityViewController alloc] initWithActivityItems:shareItems applicationActivities:nil];
if(avc.popoverPresentationController){
    avc.popoverPresentationController.sourceView = self.view;
}
[self presentViewController:avc animated:YES completion:nil];

See this post

Answer 4

可能低于代码可能有所帮助：

在iPad中，视图控制器将使用新的UIPopoverPresentationController显示为弹出窗口，它需要使用以下三个属性之一指定弹出窗口的锚点：

barButtonItem
sourceView
sourceRect

请执行以下操作：

//for iPhone
if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPhone) {

    [self presentViewController:controller animated:YES completion:nil];

}
//for iPad
else {
    // Change Rect as required
    ViewController *contentViewController = [[ViewController alloc] init];

    contentViewController.preferredContentSize = CGSizeMake(200, 200);
    contentViewController.modalPresentationStyle = UIModalPresentationPopover;
    [self presentViewController:contentViewController animated:YES completion:nil];
}

Answer 5

我认为最好的方法是覆盖当前方法

extension XXXBaseViewController: UIPopoverPresentationControllerDelegate {

    override func present(_ viewControllerToPresent: UIViewController, animated flag: Bool, completion: (() -> Void)? = nil) {
        if let popController = viewControllerToPresent.popoverPresentationController,
            popController.sourceView == nil{
            return
        }
        super.present(viewControllerToPresent, animated: flag, completion: completion)
    }
}

在iOS 9上进行演示之前，UIPopoverPresentationController应该设置一个非零的sourceView或barButtonItem

5 个答案: