Question

On my app I have a cameraOverlayView over my open camera with custom controls for the camera buttons. The app allows the user to take several pictures before closing the camera, so the shutter button does not call dismissViewControllerAnimated, instead there’s a close button for when you’re done taking pictures.

Now, one of the buttons on the camera overlay is a gallery button to allow the user to pick a saved image instead of shooting a new one. I’ve tried two different approaches to make this work, both failed.

First approach

Use the same UIImagePickerController instance that is currently presenting the overlay and switch the sourceType to library. It does present the gallery then, but when a photo is tapped, I can’t dismiss the galley without dismissing the whole overlay.

Second approach

Create a separate instance of UIImagePickerController, set the sourceType to gallery and attempt to call presentViewController, which then fails with the warning:

“Warning: Attempt to present on
whose view is not in the window
hierarchy!”

Does anyone have a solution for this issue? Is this even possible?

Answer 1

Try this~~ I think it is your goal.

#import "ViewController.h"

@interface ViewController ()

@property (nonatomic, strong) UIImagePickerController *imagePicker;

@end

@implementation ViewController

@synthesize imagePicker = _imagePicker;

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.

}


- (void)viewDidAppear:(BOOL)animated
{
    [super viewDidAppear:YES];

    sleep(2);

    _imagePicker = [[UIImagePickerController alloc] init];
    [_imagePicker setSourceType:UIImagePickerControllerSourceTypeCamera];
    [_imagePicker setDelegate:self];

    UIButton *button = [[UIButton alloc] initWithFrame:CGRectMake(10, 50, 100, 30)];
    [button setTitle:@"Library" forState:UIControlStateNormal];
    [button setBackgroundColor:[UIColor darkGrayColor]];
    [button addTarget:self action:@selector(gotoLibrary:) forControlEvents:UIControlEventTouchUpInside];

    [_imagePicker.view addSubview:button];

    [self presentViewController:_imagePicker animated:YES completion:nil];
}
- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

-(IBAction)gotoLibrary:(id)sender
{
    UIImagePickerController *imagePicker = [[UIImagePickerController alloc] init];
    [imagePicker.view setFrame:CGRectMake(0, 80, 320, 350)];
    [imagePicker setSourceType:UIImagePickerControllerSourceTypeSavedPhotosAlbum];
    [imagePicker setDelegate:self];

    [_imagePicker presentViewController:imagePicker animated:YES completion:nil];
}


- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
    [picker dismissViewControllerAnimated:YES completion:nil];
}
- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker
{
    [picker dismissViewControllerAnimated:YES completion:nil];
}
@end