Question

单击userButtonPressed时，以UIButton为参数调用

userUIBtn。

但是，我想访问UIBarButtonItem ，以便显示一个popover。

以下是generateToolbar()方法，可生成用户导航按钮。

-(void) generateToolbar {

    // Initialize the `ButtonFactory`

    ButtonFactory *buttonFactory = [[ButtonFactory alloc] init];

    // Generate some `UIButton(s)`

    UIButton *userUIBtn = [buttonFactory createButtonWithButtonType:ButtonTypeUser];
    userUIBtn.frame = CGRectMake(0,0,55,20);

    // Add an action to the `UIButton`        

    [userUIBtn addTarget:self action:@selector(userButtonPressed:) forControlEvents:UIControlEventTouchUpInside];

    // Generate an `UIBarButtonItem` with the `UIButton` as basis view

    UIBarButtonItem *userBtn = [[UIBarButtonItem alloc] initWithCustomView:userUIBtn];

    // Add the `UIBarButtonItem` into the right side of the `navigationItem`

    self.navigationItem.rightBarButtonItems = [[NSArray alloc] initWithObjects: userBtn, nil];

}

以下是userButtonPressed()方法，按用户按钮触发，并在该按钮周围生成一个弹出窗口 - 它未被调用。< / p>

- (IBAction) userButtonPressed:(UIBarButtonItem*)sender {

    // Initialize the `ButtonFactory`
    ButtonFactory *buttonFactory = [[ButtonFactory alloc] init];

    // Generate some `UIButton(s)`
    UIButton *feedbackUIBtn = [buttonFactory createButtonWithButtonType:ButtonTypeFeedback iconVisibility:YES textVisibility:YES capitalization:NO iconSize:20.0 textSize:20.0];
    [feedbackUIBtn addTarget:self action:@selector(feedbackBtnClicked:) forControlEvents:UIControlEventTouchUpInside];
    feedbackUIBtn.frame = CGRectMake(0,50,300,50);

    // Create a `UIViewController` and add the `UIButtons` as subviews
    UIViewController *viewController = [[UIViewController alloc] init];
    [viewController.view addSubview:feedbackUIBtn];

    // Present the `UIViewController`
    viewController.modalPresentationStyle = UIModalPresentationPopover;
    [self presentViewController:viewController animated:YES completion:nil];

    // Set up the `UIPopoverPresentationController`
    UIPopoverPresentationController *popController = [viewController popoverPresentationController];
    popController.permittedArrowDirections = UIPopoverArrowDirectionUp;
    popController.barButtonItem = sender;

}

Answer 1

我的解决方案是在两个地方编辑动作处理程序，我将参数从UIBarButtonItem更改为UIButton并将popController.barButtonItem = sender;更改为popController.sourceView = sender;。

- (IBAction) userButtonPressed:(UIButton*)sender {
    ...
    popController.sourceView = sender;
    ...
}

在UIBarButtonItem内的UIButton周围显示一个popover

1 个答案: