objective-c - UIPopoverPresentationController 应该在 iOS 9 上呈现之前设置一个非零的 sourceView 或 barButtonItem

Question

我正在尝试使用自定义 UIPopoverPresentationController 类显示弹出窗口。但它因错误而崩溃 (<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];
}

下面是我的自定义 UIPopoverPresentationController 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;
}

我没有条形按钮，但我正在设置 sourceView。我在这里做错了什么吗？感谢您的帮助

Answer 1

你也可以像这样创建一个 popover presentation controller，它可能会工作

- (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];
}