UIPopoverController顯示在另一個按鈕上

Question

當UIButton被點擊以顯示UIPopovercontroller時，它顯示在另一個UIbarbuttonitemand上並顯示空白的黑色不透明UIPopovercontroller。

這裏是我的實現代碼：

- (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

你缺少assing sender到btnAction

是UIButton *btnAction=(UIButton *)sender;

試試這個，

- (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]; 
} 

Answer 2

UIButton *btnAction=(UIButton*) sender; 

Answer 3

你的問題就在這裏

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

其中presentPopoverFromRect:popoverFrame應該是真正的酥料餅的RECT沒有UIButton，也是的btnAction沒有框架，你還沒有分配它，你是執行CGRect popoverFrame = btnAction.frame;

應該是這樣

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

希望這有助於。