11

我创建了一个从相机捕获图像的应用程序。这是我的代码

 -(IBAction) showCameraUI {
    BOOL hasCamera = [UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera];
    UIImagePickerController* picker = [[UIImagePickerController alloc] init];
    picker.delegate = self;
    picker.sourceType = hasCamera ? UIImagePickerControllerSourceTypeCamera :    UIImagePickerControllerSourceTypePhotoLibrary;
    [self presentModalViewController:picker animated:YES];
}

并实现了这个委托方法来获取捕获的图像

- (void)imagePickerController:(UIImagePickerController *)picker
didFinishPickingMediaWithInfo:(NSDictionary *)info
{
    [picker dismissModalViewControllerAnimated:YES];
    UIImage* image = [info objectForKey:UIImagePickerControllerOriginalImage];
    UIImage *yourImageView = image;
}

如果用户取消控制器，则实现此方法

- (void)imagePickerControllerDidCancel:(UIImagePickerController*)picker
{
    [picker dismissModalViewControllerAnimated:YES];
}

但它显示了这个例外。有谁知道为什么在执行最后一行函数 showCameraUI 后会显示这样的异常。

UIStatusBarStyleBlackTranslucent is not available on this device. 2013-02-07 
10:06:06.976 CaptureImage[460:c07] *** Terminating app due to uncaught exception
'NSInvalidArgumentException', reason: 'On iPad, UIImagePickerController must be 
presented via UIPopoverController'
4

3 回答 3

14

关于异常，错误信息很清楚。“在 iPad 上，UIImagePickerController 必须通过 UIPopoverController 呈现”对于 iPad，您应该以 aUIPopoverController而不是使用[self presentModalViewController:picker animated:YES];. 这应该可以解决问题。

例如：-

if ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPad) {
    UIPopoverController *popover = [[UIPopoverController alloc] initWithContentViewController:picker];
    [popover presentPopoverFromRect:self.view.bounds inView:self.view permittedArrowDirections:UIPopoverArrowDirectionAny animated:YES];
    self.popover = popover;
} else {
    [self presentModalViewController:picker animated:YES];
}

编辑：正如@rmaddy 所述，相机可以模态呈现。以上适用于sourceTypeis时UIImagePickerControllerSourceTypePhotoLibrary。

于 2013-02-07T06:30:23.503 回答
5

@Arun 我也面临同样的问题，在头文件中添加全局属性。

我希望下面的代码对你有用

UIImagePickerController *imgPicker = [[UIImagePickerController alloc] init];
   [imgPicker setDelegate:self];
   [imgPicker setSourceType:UIImagePickerControllerSourceTypePhotoLibrary];
   [imgPicker setAllowsEditing:YES];
   [imgPicker setModalPresentationStyle:UIModalPresentationCurrentContext];

   UIPopoverController *popOver = [[UIPopoverController alloc] initWithContentViewController:imgPicker];
   popOver.delegate = self;
   self.popoverImageViewController = popOver;
   [self.popoverImageViewController presentPopoverFromRect:CGRectMake(0, 0, 160, 40) inView:self.view permittedArrowDirections:UIPopoverArrowDirectionAny animated:YES];

在该头文件中创建这样的全局属性

@property (strong) UIPopoverController *popoverImageViewController;
于 2013-08-13T13:12:55.097 回答
0

对于带有 iOS11 的 Swift：

            videoEditor.modalPresentationStyle = .popover
            self.present(picker, animated: true)

            let popover = picker.popoverPresentationController
            popover?.sourceView = self.view

            // then config popover frame and arrow style here
于 2018-03-29T13:51:14.387 回答