Question

我是iOS开发的新手，遇到了一个我似乎无法找到解决方案的错误。我到处寻找解决方案，但也许是我的新意让我无法看到问题。

日志中打印的确切警告是：

尝试从视图控制器中解除＆lt; _UIAlertShimPresentingViewController：0x7aaa4b90＆gt;正在进行演示或解雇！

在触摸actionSheet上的按钮后立即发生。

以下是代码：

- (void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex {

UIImagePickerController *picker = [[UIImagePickerController alloc] init];
picker.delegate = self;

if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) {

    if (buttonIndex == 0) {

        picker.sourceType = UIImagePickerControllerSourceTypeCamera;

        [self presentViewController:picker animated:YES completion:nil];
    }
    else if (buttonIndex == 1) {

        picker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;

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

    }
    else if (buttonIndex == 2) {
        picker.sourceType = UIImagePickerControllerSourceTypeSavedPhotosAlbum;

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

    }

} else {

    if (buttonIndex == 0) {

        picker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;


        [self presentViewController:picker animated:NO completion:NULL];


    }
    else if (buttonIndex == 1) {

        picker.sourceType = UIImagePickerControllerSourceTypeSavedPhotosAlbum;

        [self presentViewController:picker animated:YES completion:NULL];


    }


}
}

actionSheet的实现，我在IBAction上连接了一个位于.xib文件的工具栏按钮。

   - (IBAction)addImage:(id)sender {

UIActionSheet *popUpSheet = [[UIActionSheet alloc]
                             initWithTitle:nil
                             delegate:self
                             cancelButtonTitle:nil
                             destructiveButtonTitle:nil
                             otherButtonTitles: nil];

if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) {

    [popUpSheet addButtonWithTitle:@"Camera"];
    [popUpSheet addButtonWithTitle:@"Photo Library"];
    [popUpSheet addButtonWithTitle:@"Camera Roll"];

    [popUpSheet addButtonWithTitle:@"Cancel"];

    popUpSheet.cancelButtonIndex = popUpSheet.numberOfButtons-1;

}   else {

    [popUpSheet addButtonWithTitle:@"Photo Library"];
    [popUpSheet addButtonWithTitle:@"Camera Roll"];

    [popUpSheet addButtonWithTitle:@"Cancel"];

    popUpSheet.cancelButtonIndex = popUpSheet.numberOfButtons-1;

}

[popUpSheet showFromBarButtonItem: self.toolbarItems[0] animated:YES];  }

从我所知道的，所有事情都被正确授权：

DetailViewController.m

@interface DetailViewController () < UINavigationControllerDelegate, UIImagePickerControllerDelegate >

DetailViewController.h

@interface DetailViewController : UIViewController <UIActionSheetDelegate>

任何见解都会受到高度赞赏并非常有帮助。

Answer 1

您的代码看起来是正确的。尝试使用：

actionSheet:didDismissWithButtonIndex:

方法。动画结束后，它会发送给代表。希望它有所帮助。

Answer 2

终于找到了问题所在。编译器给了我这个警告，因为Apple最近将UIActionsheet和UIAlert组合成一个名为UIAlertController的控制器类型。使用了新的UIAlertController，我的问题解决了。

- (IBAction)addImage:(id)sender {

UIImagePickerController *picker = [[UIImagePickerController alloc] init];
picker.delegate = self;

UIAlertController *popUpSheet = [UIAlertController alertControllerWithTitle:nil message:@"Select your Choice" preferredStyle:UIAlertControllerStyleActionSheet];

UIAlertAction *photoLibrary = [UIAlertAction actionWithTitle:@"Photo Library" style:UIAlertActionStyleDefault handler:^(UIAlertAction *action) {

                            picker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
                            [self presentViewController:picker animated:YES completion:nil];

                            NSLog(@"Photo Library was touched");
                            [popUpSheet dismissViewControllerAnimated:YES completion: nil];
                         }];

UIAlertAction *recentPhotos = [UIAlertAction actionWithTitle:@"Camera Roll" style:UIAlertActionStyleDefault handler:^(UIAlertAction *action) {

                            picker.sourceType = UIImagePickerControllerSourceTypeSavedPhotosAlbum;
                            [self presentViewController:picker animated:YES completion:nil];

                            NSLog(@"Camera Roll was touched");
                            [popUpSheet dismissViewControllerAnimated:YES completion: nil];

                        }];

UIAlertAction *camera = [UIAlertAction actionWithTitle:@"Camera" style:UIAlertActionStyleDefault handler:^(UIAlertAction *action) {

                            picker.sourceType = UIImagePickerControllerSourceTypeCamera;
                            [self presentViewController:picker animated:YES completion:nil];

                            NSLog(@"Camera was touched");
                            [popUpSheet dismissViewControllerAnimated:YES completion:nil];
                        }];

UIAlertAction *cancel = [UIAlertAction actionWithTitle:@"Cancel" style:UIAlertActionStyleDefault handler:^(UIAlertAction *action) {

                            [popUpSheet dismissViewControllerAnimated:YES completion:nil];
                        }];

[popUpSheet addAction:photoLibrary];
[popUpSheet addAction:recentPhotos];

if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) {
[popUpSheet addAction:camera];
}

[popUpSheet addAction:cancel];

[self presentViewController:popUpSheet animated:YES completion:nil];
}

按下actionSheet按钮后的警告消息

2 个答案: