Setting Image from gallery in iOS - ios

Question

I select an image from gallery and display on UIImageView but when I click back button and again open push to the image view controller that image is empty.
What should I do to remain same image on UIImageView after logout also?
I have used this code:
- (void)viewDidLoad {
NSString *myGrrabedImage1=#"myGrrabedImage1.png";
NSArray *path=NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentDirectory1=[path objectAtIndex:0];
NSString *fullPathToFile1=[documentDirectory1 stringByAppendingPathComponent:myGrrabedImage1];
NSData *data=[NSData dataWithContentsOfFile:fullPathToFile1];
[[self teacherImg]setImage:[UIImage imageWithData:data]];
[data writeToFile:fullPathToFile1 atomically:YES];
}
- (IBAction)selectImg:(id)sender {
pickerController = [[UIImagePickerController alloc]init];
pickerController.delegate = self;
[self.imagePicker setSourceType:UIImagePickerControllerSourceTypePhotoLibrary];
UIImage * img = [info valueForKey:UIImagePickerControllerEditedImage];
teacherImg.image = img;
[self presentViewController:pickerController animated:YES completion:nil];
}
- (void) imagePickerController:(UIImagePickerController *)picker
didFinishPickingImage:(UIImage *)image
editingInfo:(NSDictionary *)editingInfo
{
NSData *data=UIImagePNGRepresentation(teacherImg.image);
NSString *myGrrabedImage1=#"myGrrabedImage1.png";
NSArray *path=NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentDirectory1=[path objectAtIndex:0];
NSString *fullPathToFile=[documentDirectory1 stringByAppendingPathComponent:myGrrabedImage1];
[data writeToFile:fullPathToFile atomically:YES];
imagePicker.allowsEditing = YES;
imagePicker.delegate = self;
[[self teacherImg]setImage:image];
[self dismissViewControllerAnimated:YES completion:nil];
}

Answer 1

In viewDidLoad() method you need to load image from doc. dir.
NSString *myGrrabedImage1 = #"myGrrabedImage1.png";
NSArray *path = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentDirectory1 = [path objectAtIndex:0];
NSString *fullPathToFile = [documentDirectory1 stringByAppendingPathComponent:myGrrabedImage1];
Method 1:
NSData *imgData = [NSData dataWithContentsOfFile: fullPathToFile];
UIImage *thumbNail = [[UIImage alloc] initWithData:imgData];
Method 2:
UIIMage *image = [UIImage imageWithContentsOfFile: fullPathToFile];
[imgView setImage: image];

Answer 2

You should read the image data and set the ImageView image in the viewWillAppear method.
viewDidLoad is called only once, after the view has been loaded from the xib/storyboard

Answer 3

Try this way;
- (void)viewDidLoad {
NSString *myGrrabedImage1 = #"myGrrabedImage1.png";
NSArray *path =
NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentDirectory1 = [path objectAtIndex:0];
NSString *pathFile = [documentDirectory1 stringByAppendingPathComponent:myGrrabedImage1];
UIIMage *image = [UIImage imageWithContentsOfFile: pathFile];
[teacherImg setImage: image];
}
- (IBAction)selectImg:(id)sender {
pickerController = [[UIImagePickerController alloc]init];
pickerController.delegate = self;
[self.imagePicker setSourceType:UIImagePickerControllerSourceTypePhotoLibrary];
[self presentViewController:pickerController animated:YES completion:nil];
}
- (void) imagePickerController:(UIImagePickerController *)picker
didFinishPickingImage:(UIImage *)image
editingInfo:(NSDictionary *)editingInfo
{
UIImage * img = [info valueForKey:UIImagePickerControllerEditedImage];
teacherImg.image = img;
NSData *data=UIImagePNGRepresentation(teacherImg.image);
NSString *myGrrabedImage1=#"myGrrabedImage1.png";
NSArray *path=NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentDirectory1=[path objectAtIndex:0];
NSString *fullPathToFile=[documentDirectory1 stringByAppendingPathComponent:myGrrabedImage1];
[data writeToFile:fullPathToFile atomically:YES];
[[self teacherImg]setImage:image];
[self dismissViewControllerAnimated:YES completion:nil];
}