Save a picture after the application is closed - ios

Question

There is a simple application, on the storyboard added UIImageView and button
Button opens the photo gallery, and I choose an image and eventually it appears on the UIimaeView
But when I kill the application snapshot is not saved What to do?
this my code :
-(IBAction)takePic:(id)sender {
UIImagePickerController *picker = [[UIImagePickerController alloc] init];
picker.delegate = self;
picker.allowsEditing = YES;
picker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
[self presentViewController:picker animated:YES completion:NULL];
}
-(void)imagePickerControllerDidCancel:(UIImagePickerController *)picker {
[picker dismissViewControllerAnimated:YES completion:nil];
}
-(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
self.image.image=[info objectForKey:UIImagePickerControllerOriginalImage];
[self dismissViewControllerAnimated:YES completion:nil];
}

Answer 1

ok. try this:
#import "ViewController.h"
#import AssetsLibrary;
#interface ViewController () <UIImagePickerControllerDelegate, UINavigationControllerDelegate>
#property (weak, nonatomic) IBOutlet UIImageView *imageView;
#property (strong, nonatomic) UIImagePickerController *picker;
#end
#implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];
NSURL *selectedImageURL = [NSURL URLWithString:[userDefaults objectForKey:#"selectedImageURL"]];
if (selectedImageURL) {
[self getImageFromAssetsAtURL:selectedImageURL completion:^(UIImage *image, NSError *error) {
if (!error && image) {
self.imageView.image = image;
}
}];
}
}
- (IBAction)pickImage:(UIButton *)sender {
[self presentViewController:self.picker animated:YES completion:nil];
}
- (UIImagePickerController *)picker {
if (!_picker) {
_picker = [UIImagePickerController new];
_picker.delegate = self;
_picker.sourceType = UIImagePickerControllerSourceTypeSavedPhotosAlbum;
}
return _picker;
}
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary<NSString *,id> *)info {
UIImage *selectedImage = info[UIImagePickerControllerOriginalImage];
NSURL *selectedImageURL = info[UIImagePickerControllerReferenceURL];
// set image
self.imageView.image = selectedImage;
// save image url
NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];
[userDefaults setObject:selectedImageURL.absoluteString forKey:#"selectedImageURL"];
[userDefaults synchronize];
// dismiss
[self dismissViewControllerAnimated:YES completion:nil];
}
- (void)getImageFromAssetsAtURL:(NSURL *)imageURL completion:(void (^)(UIImage *, NSError *))completion {
ALAssetsLibrary *library = [ALAssetsLibrary new];
[library assetForURL:imageURL resultBlock:^(ALAsset *asset) {
UIImage *image = [UIImage imageWithCGImage:[[asset defaultRepresentation] fullResolutionImage]];
completion(image, nil);
} failureBlock:^(NSError *error) {
completion(nil, error);
}];
}
#end
since the AssetsLibrary is deprecated as of iOS 9.0 you could and should use the Photos framework instead. you have to import it...
#import Photos;
and change the getImageFromAssetsAtURL... method to the following:
PHFetchResult *result = [PHAsset fetchAssetsWithALAssetURLs:#[imageURL] options:nil];
if (result.count == 1) {
PHAsset *asset = result.firstObject;
[[PHImageManager defaultManager] requestImageDataForAsset:asset options:nil resultHandler:^(NSData * _Nullable imageData, NSString * _Nullable dataUTI, UIImageOrientation orientation, NSDictionary * _Nullable info) {
UIImage *selectedImage = [UIImage imageWithData:imageData];
completion(selectedImage, nil);
}];
} else {
completion(nil, nil);
}

Answer 2

Finally I used this code.
-(void)viewDidLoad {
[super viewDidLoad];
[self loadDefaultImage];
}
-void)viewDidAppear:(BOOL)animated
{
[self loadDefaultImage];
}
- (IBAction)TakePic:(id)sender {
UIImagePickerController *picker = [[UIImagePickerController alloc] init];
picker.delegate = self;
picker.allowsEditing = YES;
picker.sourceType = UIImagePickerControllerSourceTypeCamera;
[self presentViewController:picker animated:YES completion:NULL];
}
-(void)imagePickerControllerDidCancel:(UIImagePickerController *)picker {
[picker dismissViewControllerAnimated:YES completion:NULL];
}
-(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
NSString *mediaType = info[UIImagePickerControllerMediaType];
[self dismissViewControllerAnimated:YES completion:nil];
if ([mediaType isEqualToString:(NSString *)kUTTypeImage]) {
UIImage *image = info[UIImagePickerControllerOriginalImage];
//append filename to document directory url
NSURL *urlSave = [[self getDocumentsPathURL] URLByAppendingPathComponent:#"imagee"];
//do something to previously taken image (in this case: delete it)
if ([[NSFileManager defaultManager] fileExistsAtPath:urlSave.path]) {
[[NSFileManager defaultManager] removeItemAtPath:urlSave.path error:nil];
}
//save image to document directory
[UIImagePNGRepresentation(image) writeToFile:urlSave.path atomically:YES];
//optional: save image to photo library
UIImageWriteToSavedPhotosAlbum(image, nil, nil, nil);
}
}
-(NSURL *)getDocumentsPathURL
{
//document directory of app
return [[NSFileManager defaultManager] URLForDirectory:NSDocumentDirectory inDomain:NSUserDomainMask appropriateForURL:nil create:YES error:nil];
}
-(void)loadDefaultImage
{
NSURL *urlImage = [[self getDocumentsPathURL] URLByAppendingPathComponent:#"imagee"];
if ([[NSFileManager defaultManager] fileExistsAtPath:urlImage.path]) {
NSData *dataFile = [[NSFileManager defaultManager] contentsAtPath:urlImage.path];
UIImage *image = [UIImage imageWithData:dataFile];
[_imageView setImage:image];
}
else {
NSLog(#"Image not found");
}
}