在点击点放置一个 UIView 以启动弹出窗口

Question

在我认为解决从UITableViewRowAction 启动弹出框问题的一种相当聪明的方法中，我想在目标操作上放置一个明确的UIView 并将其用于sourceRect 锚定UIPopoverPresentationController。在这种情况下，目标操作是下面屏幕截图中显示的橙色“Acct”按钮。

我在整个 tableview 上使用了一个明确的UIView (self.clearTopView)，并使用源自（所以我认为）点击位置 (@987654332) 的框架来初始化启动视图 (tappedViewOverlay) @) 和 CGSize (tappedRectSize)。然后我将它作为子视图添加到self.clearTopView。我现在把它涂成黑色，这样我就可以找到它了。

如下图所示，部分方案正在按计划进行。 tappedViewOverlay 视图已添加，并适当着色。 popoverPresentationController (thisPPC) 按预期从该视图启动。

问题是视图始终位于屏幕的左上角，而不是所需的位置，即点击发生的位置。以下是相关代码：

    else if ([[segue identifier] isEqualToString:@"AccountPopSegue"])
    {

        UITapGestureRecognizer *tapGestureRecognizer;

        CGPoint point = [tapGestureRecognizer locationInView:self.clearTopView];

        NSString *pointString = NSStringFromCGPoint(point);

        NSLog(@"point is located at %@",pointString);


        CGSize tappedRectSize= CGSizeMake(60,60);
        CGRect tappedRect = {point,tappedRectSize};

        NSString * tappedRectString = NSStringFromCGRect(tappedRect);

        NSLog(@"tappedRect = %@",tappedRectString);


        tappedViewOverlay = [[UIView alloc]initWithFrame:tappedRect];
        tappedViewOverlay.backgroundColor = [UIColor blackColor];

        [self.clearTopView addSubview:tappedViewOverlay];

        [self.clearTopView setUserInteractionEnabled:NO];


        NSString *tappedOverlayFrame = NSStringFromCGRect(tappedViewOverlay.frame);
        NSLog(@"tappedViewOverlay.frame = %@",tappedOverlayFrame);


        UIViewController *controller = segue.destinationViewController;
        controller.popoverPresentationController.delegate = self;
        controller.preferredContentSize = CGSizeMake(320, 186);
        UIPopoverPresentationController *thisPPC = controller.popoverPresentationController;


        thisNavController = (UINavigationController *)segue.destinationViewController;
        AccountChangeVC *acCVC = (AccountChangeVC *)thisNavController.topViewController;
        acCVC.delegate = self;

        thisPPC.sourceView = self.clearTopView;
        thisPPC.sourceRect = tappedViewOverlay.bounds;

谁能告诉我哪里出错了？

编辑

CoderWang 指出了我的代码中的一个疏忽，所以我已经纠正了它：

    else if ([[segue identifier] isEqualToString:@"AccountPopSegue"])
    {

        UITapGestureRecognizer *tapGestureRecognizer = [[UITapGestureRecognizer alloc]init];

        [self.clearTopView addGestureRecognizer:tapGestureRecognizer];



        CGPoint point = [tapGestureRecognizer locationInView:self.clearTopView];

        NSString *pointString = NSStringFromCGPoint(point);

        NSLog(@"point is located at %@",pointString);


        CGSize tappedRectSize= CGSizeMake(60,60);

        CGRect tappedRect = {point,tappedRectSize};

        NSString * tappedRectString = NSStringFromCGRect(tappedRect);

        NSLog(@"tappedRect = %@",tappedRectString);


        tappedViewOverlay = [[UIView alloc]initWithFrame:tappedRect];

        tappedViewOverlay.backgroundColor = [UIColor blackColor];

        [self.clearTopView addSubview:tappedViewOverlay];

        [self.clearTopView setUserInteractionEnabled:NO];


        NSString *tappedOverlayFrame = NSStringFromCGRect(tappedViewOverlay.frame);
        NSLog(@"tappedViewOverlay.frame = %@",tappedOverlayFrame);


        UIViewController *controller = segue.destinationViewController;
        controller.popoverPresentationController.delegate = self;
        controller.preferredContentSize = CGSizeMake(320, 186);
        UIPopoverPresentationController *thisPPC = controller.popoverPresentationController;


        thisNavController = (UINavigationController *)segue.destinationViewController;
        AccountChangeVC *acCVC = (AccountChangeVC *)thisNavController.topViewController;
        acCVC.delegate = self;

        thisPPC.sourceView = self.clearTopView;
        thisPPC.sourceRect = tappedViewOverlay.bounds;

此更改（tapGestureRecognizer 的初始化和对self.clearTopView 的添加）使黑色tappedViewOverlay 视图的位置略有变化。您可以在以下屏幕截图中看到它隐藏在“返回”导航按钮后面：

Answer 1

问题是“tappedRect”不正确，不知道具体原因。 但是您可以尝试以下方法将“Acct”按钮转换为 self.clearTopView 的矩形：

CGRect tappedRect = [Acct.superview convertRect:acct.frame toView:self.clearTopView];

或转换为窗口（因为 self.clearTopView 在整个 tableview 上）：

CGRect tappedRect = [Acct.superview convertRect:acct.frame toView:nil];