ios8中iphone的UIPopoverController显示白屏

Posted 2023-03-13

【中文标题】ios8中iphone的UIPopoverController显示白屏

【英文标题】：UIPopoverController for iphone in ios8 shows white screen

【发布时间】：2014-10-14 12:15:29

【问题描述】：

在 iphone 中使用低于 ios8.0 的 UIPopovercontroller 可以正常使用此代码。但是在ios8中它显示白屏。

代码：

pickerController = [[UIViewController alloc] init];
UIView *viewV = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 150, 160)];
[viewV setBackgroundColor:[UIColor clearColor]];
popOverController = [[UIPopoverController alloc] initWithContentViewController:pickerController];
popOverController.popoverContentSize = CGSizeMake(150, 160);
[popOverController setDelegate:self];

CGRect ImageBtnFrame = [self.view convertRect:sender.frame fromView:self.view];       
[popOverController presentPopoverFromRect:ImageBtnFrame inView:self.view permittedArrowDirections:UIPopoverArrowDirectionUp animated:YES];

ios8 的任何替代方案，需要建议。

【参考方案1】：

根据2014 WWDC，在30分钟内，正确答案是：

- (void) tapButton:(id) sender

    MyViewControllerClass * vc = [[MyViewControllerClass alloc] init];
    vc.modalPresentationStyle = UIModalPresentationPopover;

    UIPopoverPresentationController * popOverController = vc.popoverPresentationController;
    [popOverController setDelegate:self];
    popOverController.sourceView = sender;
    popOverController.sourceRect = ((UIButton*)sender).frame;
    popOverController.permittedArrowDirections = UIPopoverArrowDirectionUp;

    [self presentViewController:vc
                       animated:YES
                     completion:nil];

请注意，接受的答案存在一些问题，例如：

未设置modalPresentationStyle 显示UIPopoverPresentationController * 而不是UIViewController

【讨论】：

是的，你是对的。这应该是公认的答案。

【参考方案2】：

尝试对弹出框使用新的 iOS 8 API。

pickerController = [[UIViewController alloc] init];
UIView *viewV = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 150, 160)];
[viewV setBackgroundColor:[UIColor clearColor]];

UIPopoverPresentationController *popOverController = pickerController .popoverPresentationController;
popOverController.popoverContentSize = CGSizeMake(150, 160);
[popOverController setDelegate:self];

popOverController.sourceView = self.view;
popOverController.sourceRect = sender.frame;
popOverController.permittedArrowDirections = UIPopoverArrowDirectionUp;

[self presentViewController:popOverController
                     animated:YES
                   completion:nil];

【讨论】：

[self presentViewController:popOverController animated:YES completion:nil]; 给出警告：Incompatible pointer types sending 'UIPopoverPresentationController *' to parameter of type 'UIViewController * _Nonnull'

【参考方案3】：

这会在 iOS 8 上造成。所以，我建议使用以下 Github 库。 https://github.com/skywinder/ActionSheetPicker-3.0 或者您可以编写基于 iOS 版本的代码。

    if (OLDER_THAN_IOS_8) 
       // Your regular code
       pickerController = [[UIViewController alloc] init];
       UIView *viewV = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 150, 160)];
       [viewV setBackgroundColor:[UIColor clearColor]];
       popOverController = [[UIPopoverController alloc] initWithContentViewController:pickerController];
       popOverController.popoverContentSize = CGSizeMake(150, 160);
       [popOverController setDelegate:self];

      CGRect ImageBtnFrame = [self.view convertRect:sender.frame fromView:self.view];       
      [popOverController presentPopoverFromRect:ImageBtnFrame inView:self.view permittedArrowDirections:UIPopoverArrowDirectionUp animated:YES];

     else 

     // New Code that support iOS -8 using UIPopoverPresentationController
     // Checkout @AndreasZ answer for the same