iphone - 错误 - 目标 C - '应用程序试图以模态方式呈现活动控制器 我想使用 UIImagePickerController 从 iPad 应用程序的照片库中加载照片。我正在使用以下代码行： -(IBAction)photolibrarypressed:(id)sender{ // / Create window //self.window = [[U

Question

我想使用 UIImagePickerController 从 iPad 应用程序的照片库中加载照片。我正在使用以下代码行：

-(IBAction)photolibrarypressed:(id)sender{



  // / Create window
 //self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
 NSLog(@"hi");
// Set up the image picker controller and add it to the view

//imagePickerController.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
//[window addSubview:imagePickerController.view];






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

UIImagePickerController *picker= [[UIImagePickerController alloc]init];

picker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
picker.delegate = self;

UIPopoverController *popover = [[UIPopoverController alloc] initWithContentViewController:picker];
self.popoverController = popover;          
popoverController.delegate = self;
[popoverController presentPopoverFromBarButtonItem:sender  permittedArrowDirections:UIPopoverArrowDirectionUp animated:YES];

[self presentModalViewController:picker animated:YES];
//[picker release];
imageView = [[UIImageView alloc] initWithFrame:[window bounds]];
// Set up the image view and add it to the view but make it hidden
 [window addSubview:imageView];
imageView.hidden = YES;
[window makeKeyAndVisible];     

}

但是，我收到以下错误：

Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'Application tried to present modally an active controller <splitViewDetailViewController: 

我无法理解。

该应用程序属于 SplitView 类型，我同时使用了 WebView 和 ImageView。所以，当我点击按钮照片库时，我需要进入 ImageView（我想）。

有人可以帮我解决问题吗？我对目标 C 很陌生。谢谢。

Answer 1

您已经获得了同时运行 iPhone 和 iPad 的代码。如果您使用的是 iPad，则应删除该行

[self presentModalViewController:picker animated:YES];

如果您使用的是 iPhone 或 iPod，则应删除该行

[popoverController presentPopoverFromBarButtonItem:sender  permittedArrowDirections:UIPopoverArrowDirectionUp animated:YES];

或者，如果您想在 iPad 和 iPhone 上运行您的应用程序，请使用 if 语句找出它在哪个设备上运行：

if ([UIDevice currentDevice].userInterfaceIdiom == UIUserInterfaceIdiomPad) {

    // Display in a popover for the iPad
    [popoverController presentPopoverFromBarButtonItem:sender permittedArrowDirections:UIPopoverArrowDirectionAny animated:YES];

} else {

    // Display modally for the iPhone
    [self presentModalViewController:picker animated:YES];

}