IOS image picker in navigation view controller - ios

Question

I am trying to browse an image and display in imageview using UIImagePickerController. Basically the view I am using to browse the image is based on navigationController.
But using the below code after I select the image and come back to view, I can see that the view is flickering to left right and the image is not showing in image view.
Actually the entire source code is quit long, thats why I post the image picker part only. If required I can post more code.
RegistrationFormViewController.h
#interface RegistrationFormViewController : ViewController
<UIImagePickerControllerDelegate,UINavigationControllerDelegate,CLLocationManagerDelegate>
{
CLLocationManager *locationManager;
UIImagePickerController *imagePickerController;
}
#property (strong, nonatomic) CLLocationManager *locationManager;
#property (weak, nonatomic) IBOutlet UIImageView *imageUser;
- (IBAction)registerBt:(id)sender;
RegistrationFormViewController.m
- (void)viewDidLoad {
[super viewDidLoad];
_barButtonBack.target = self.revealViewController;
_barButtonBack.action = #selector(revealToggle:);
[self.view addGestureRecognizer:self.revealViewController.panGestureRecognizer];
UITapGestureRecognizer *singleTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:#selector(tapDetected)];
singleTap.numberOfTapsRequired = 1;
[self.imageUser setUserInteractionEnabled:YES];
[self.imageUser addGestureRecognizer:singleTap];
}
-(void)tapDetected{
NSLog(#"single Tap on imageview");
imagePickerController = [[UIImagePickerController alloc]init];
imagePickerController.delegate = self;
imagePickerController.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
[self presentViewController:imagePickerController animated:YES completion:nil];
}
#pragma mark - ImagePickerController Delegate
- (void)imagePickerController:(UIImagePickerController *)picker
didFinishPickingImage:(UIImage *)image
editingInfo:(NSDictionary *)editingInfo
{
// Dismiss the image selection, hide the picker and
//show the image view with the picked image
[picker dismissViewControllerAnimated:YES completion:nil];
[self.imageUser setImage:image];
self.imageUser.contentMode = UIViewContentModeScaleAspectFill;
}
-(void)imagePickerControllerDidCancel:(UIImagePickerController *)picker
{
[picker dismissViewControllerAnimated:YES completion:nil];
}

Answer 1

There is no issue in your code that you showed here. However try this in didFinishPickingImage -
dispatch_async(dispatch_get_main_queue(), ^{
self.imageUser.contentMode = UIViewContentModeScaleAspectFill;
[self.imageUser setImage:image];
});
and move this code to viewDidLoad
imagePickerController = [[UIImagePickerController alloc]init];
imagePickerController.delegate = self;
imagePickerController.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
you can also check whether you are getting the image or not using breakpoint.

Answer 2

try this delegate method
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info {
UIImage *chosenImage = info[UIImagePickerControllerOriginalImage];
[picker dismissViewControllerAnimated:YES completion:NULL];
}

Answer 3

In viewcontroller.m file, just put this code:
#import <AssetsLibrary/AssetsLibrary.h>
typedef void (^ALAssetsLibraryAssetForURLResultBlock)(ALAsset *asset);
typedef void (^ALAssetsLibraryAccessFailureBlock)(NSError *error);
- (IBAction)Gallery:(id)sender {
self.ImagePickerController = [[UIImagePickerController alloc]init];
self.ImagePickerController.delegate = self;
self.ImagePickerController.sourceType = UIImagePickerControllerSourceTypeSavedPhotosAlbum;
[self presentViewController:self.ImagePickerController animated:YES completion:nil];
}
- (IBAction)Camera:(id)sender {
self.ImagePickerController = [[UIImagePickerController alloc]init];
self.ImagePickerController.delegate = self;
self.ImagePickerController.sourceType = UIImagePickerControllerSourceTypeCamera;
[self presentViewController:self.ImagePickerController animated:YES completion:nil];
}
-(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary<NSString *,id> *)info
{
[picker dismissViewControllerAnimated:YES completion:nil];
NSURL *imageUrl = (NSURL *)[info objectForKey:UIImagePickerControllerReferenceURL];
ALAssetsLibraryAssetForURLResultBlock resultblock = ^(ALAsset *myasset)
{
ALAssetRepresentation *representation = [myasset defaultRepresentation];
CGImageRef resolutionRef = [representation fullResolutionImage];
if (resolutionRef) {
UIImage *image = [UIImage imageWithCGImage:resolutionRef scale:1.0f orientation:(UIImageOrientation)representation.orientation];
self.SelectedImage.image =image;
}
};
ALAssetsLibraryAccessFailureBlock failureblock = ^(NSError *myerror)
{
NSLog(#"cant get image - %#",[myerror localizedDescription]);
};
if(imageUrl)
{
ALAssetsLibrary* assetslibrary = [[ALAssetsLibrary alloc]init];
[assetslibrary assetForURL:imageUrl resultBlock:resultblock failureBlock:failureblock];
}
}
In viewcontroller.h file
#interface ViewController : UIViewController<UIImagePickerControllerDelegate,UINavigationControllerDelegate>
#property (nonatomic)UIImagePickerController *ImagePickerController;
#property (weak, nonatomic) IBOutlet UIImageView *SelectedImage;