Prompt iOS user to select JPEG to be processed by app

Question

I've done this in Android with but can't seem to find any information on doing this in iOS. Basically:

Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
intent.setType("image/JPEG");
Intent i = Intent.createChooser(intent, "File");
startActivityForResult(i, CHOOSE_FILE_REQUESTCODE);

Then

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    // Check which request we're responding to
    if (requestCode == CHOOSE_FILE_REQUESTCODE) {
        // Make sure the request was successful
        if (resultCode == RESULT_OK) {
            // The user picked a contact.
            // The Intent's data Uri identifies which contact was selected.

            // Do something with the contact here (bigger example below)
        }
    }
}

What/where is the corresponding terminology & sample code?

(Objective-C Examples Appreciated)

score 1 · Answer 1 · answered Jul 22 '19 at 20:44

The UIImagePickerController view controller in iOS is a standard way of allowing the user to choose pictures from there media library. The Apple documentation on this is available at UIImagePickerController. There is also a good tutorial that shows how to use UIImagePickerController at Picking images with UIImagePickerController in Swift 5.

score 0 · Answer 2 · answered Jul 22 '19 at 20:46

0

This should exactly what you're looking for: https://stackoverflow.com/a/41717882/2968456

Basically you need to use Apple's built-in UIImagePicker framework.

answered Jul 22 '19 at 20:46

janakmshah

154
9

Enigma · Accepted Answer · 2019-07-24T16:06:40.003

Credit primarily goes to other answers for reference but here's the Objective-C example code:

UIImagePickerController *picker = [[UIImagePickerController alloc] init];
picker.delegate = self;
picker.allowsEditing = YES;
picker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
presentViewController:picker animated:YES completion:nil];

Callback with image data:

/*============================================================================*/

-(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info

/*============================================================================*/
{
    [picker dismissViewControllerAnimated:YES completion:nil];
    [picker release];

    UIImage* image = [info objectForKey:UIImagePickerControllerEditedImage];
    if (!image)
        image = [info objectForKey:UIImagePickerControllerOriginalImage];

    NSData* imgData = UIImageJPEGRepresentation(image, 1.0);
    NSLog(@"Size of Image(bytes):%lu",(unsigned long)[imgData length]);
}

Delegate/self must be:

UIViewController <UINavigationControllerDelegate, UIImagePickerControllerDelegate>

Prompt iOS user to select JPEG to be processed by app

3 Answers3