[SOLVED] Use ios UIImagePickerController to picking a photo in qt5.3

[hasti66]

Hi, I want to implement an application for ios. I've used qt5.3 on mac. I want to defined user interface in qt. I want to have a button on ui. when cliking on that, ios photo library will be opened and then user can be able to select a photo. I know that i must use UIImagePickerController. but always i get this error and photo library is not opened.
this error:
Warning: Attempt to present <UIImagePickerController: 0xa8c4520> on <APLViewController: 0xa9eaa90> whose view is not in the window hierarchy!

here is my code:
//.mm file

#import <UIKit/UIKit.h>
#import <Foundation/Foundation.h>
#import <Foundation/NSString.h>

#import "mainwindow.h"
#include <QDebug>

@interface APLViewController : UIViewController <UINavigationControllerDelegate, UIImagePickerControllerDelegate>
{
}
@property (nonatomic) UIImagePickerController *imagePickerController;
@end

@implementation APLViewController
MainWindow *mWindowInstance;

• (int)showImagePickerForPhotoPicker:(MainWindow *)myInstance
  {
  myInstance->text->append("showImagePickerForPhotoPicker");
  [self showImagePickerForSourceType:UIImagePickerControllerSourceTypePhotoLibrary];

  return 5;
  }

• (void)showImagePickerForSourceType:(UIImagePickerControllerSourceType)sourceType
  {
  NSLog(@"start of showImagePickerForSourceType");

  UIImagePickerController *imagePickerController = [[UIImagePickerController alloc] init];
  imagePickerController.modalPresentationStyle = UIModalPresentationCurrentContext;
  imagePickerController.sourceType = sourceType;
  imagePickerController.delegate = (id)self;

  self.imagePickerController = imagePickerController;
  [self presentViewController:self.imagePickerController animated:YES completion:nil];

  NSLog(@"end of showImagePickerForSourceType");
  }

// This method is called when an image has been chosen from the library or taken from the camera.

• (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
  {
  UIImage *image = [info valueForKey:UIImagePickerControllerOriginalImage];
  [self finishAndUpdate];
  }

• (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker
  {
  [self dismissViewControllerAnimated:YES completion:NULL];
  }

void MainWindow::bridgeMethod(void*context, MainWindow *qIns)
{
mWindowInstance = qIns;
context = [[APLViewController alloc] init];
[(id) context showImagePickerForPhotoPicker:qIns];
}

@end

I know the problem is in this line:
[self presentViewController:self.imagePickerController animated:YES completion:nil];
how can i handle that? please help me
Thanks in advance...

[Gianluca]

You have to use the root controller and show the UIPickerImageController on that.
For doing so, you need to use some internal Qt Api:

• first, in the .pro declare you want to use private headers:
  @
  QT += gui-private
  @
• then, in your .mm code get the pointer to the root view controller of the Qt app:
  @
  UIView *view = static_cast<UIView >( QGuiApplication::platformNativeInterface()->nativeResourceForWindow("uiview",quickView) );
  UIViewController rootCtrl = [[view window] rootViewController];
  @
• and now, you can show the UIImagePickeController:
  @
  [rootCtrl presentViewController:imagePickerController animated:YES completation:nil]
  @

[hasti66]

thank you very much. I will try with your guide.