iphone - UIPopoverController 显示在另一个按钮上

Question

当点击 UIButton 以显示 UIPopovercontroller 时，它会显示在另一个 UIbarbuttonite 上，并且它会显示空白的黑色不透明 UIPopovercontroller。

这是我实现的代码：

- (IBAction)buttonTapped:(id)sender {

UIButton *btnAction;

BookmarkViewController* bookmarkVC = [[BookmarkViewController alloc] init];

_buttonPopoverController = [[UIPopoverController alloc]
                                initWithContentViewController:bookmarkVC];

_buttonPopoverController.delegate = self;

CGRect popoverFrame = btnAction.frame;
[_buttonPopoverController setPopoverContentSize:CGSizeMake(320, 355) animated:NO];

//only required if using delegate methods

[_buttonPopoverController presentPopoverFromRect:popoverFrame
                                              inView:self.view
                            permittedArrowDirections:UIPopoverArrowDirectionUp
                                            animated:YES];
}

Answer 1

UIButton *btnAction=(UIButton*) sender;

Answer 2

你的问题在这里

[_buttonPopoverController presentPopoverFromRect:popoverFrame
                                              inView:self.view
                            permittedArrowDirections:UIPopoverArrowDirectionUp
                                            animated:YES];

presentPopoverFromRect:popoverFrame实际上应该是弹出框的矩形而不是，UIButton而且btnAction没有框架，你还没有分配它，你正在执行CGRect popoverFrame = btnAction.frame;

它应该像

[popover presentPopoverFromRect:CGRectMake(0.0, 0.0, 300.0, 50.0) inView:self.view
               permittedArrowDirections:UIPopoverArrowDirectionUp animated:YES];

希望这可以帮助。

Answer 3

你错过sender了btnAction

那是 UIButton *btnAction=(UIButton *)sender;

尝试这个，

- (IBAction)buttonTapped:(id)sender {

UIButton *btnAction=(UIButton *)sender;


UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"MainStoryboard" bundle:nil];
UIViewController *bookmarkVC = [storyboard instantiateViewControllerWithIdentifier:@"BookmarkViewController"];

_buttonPopoverController = [[UIPopoverController alloc]
                                initWithContentViewController:bookmarkVC];

_buttonPopoverController.delegate = self;

CGRect popoverFrame = btnAction.frame;
[bookmarkVC setContentSizeForViewInPopover:CGSizeMake(320, 355)];

//only required if using delegate methods

[_buttonPopoverController presentPopoverFromRect:popoverFrame
                                              inView:self.view
                            permittedArrowDirections:UIPopoverArrowDirectionUp
                                            animated:YES];
}