只有在相機拍攝時才將圖像保存到照片庫，如果從照片庫中選擇則不能

Question

我的應用程序中有一個照片選擇器，詢問用戶是否要拍照或從照片庫中選擇一個。 完成他們的選擇后，我將圖像視圖設置為他們選擇的圖像，我想保存他們剛剛設置的圖像，如果它是從相機拍攝的，而不是它只是他們已經擁有的照片的編輯版本。 這里列出的最后一個方法是我希望保存照片的方法。

- (IBAction)startPicker:(id)sender {

    if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) {
        UIActionSheet *picChoice = [[UIActionSheet alloc] initWithTitle:nil delegate:self cancelButtonTitle:@"Cancel" destructiveButtonTitle:nil otherButtonTitles:@"Camera", @"Photo Library", nil];
        [picChoice showFromRect:[(UIButton *)sender frame] inView:self.view animated:YES];
    } else {
        UIActionSheet *picChoice = [[UIActionSheet alloc] initWithTitle:nil delegate:self cancelButtonTitle:@"Cancel" destructiveButtonTitle:nil otherButtonTitles:@"Photo Library", nil];
        [picChoice showFromRect:[(UIButton *)sender frame] inView:self.view animated:YES];
    }
}


- (void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex {

    UIImagePickerController *imagePicker = [[UIImagePickerController alloc] init];
    imagePicker.delegate = self;
    imagePicker.allowsEditing = YES;

    if ([[actionSheet buttonTitleAtIndex:buttonIndex] isEqualToString:@"Camera"]) {
    imagePicker.sourceType = UIImagePickerControllerSourceTypeCamera;
    } else if ([[actionSheet buttonTitleAtIndex:buttonIndex] isEqualToString:@"Photo Library"]) {
    imagePicker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
    } else {
        return;
    } 
    [self presentViewController:imagePicker animated:YES completion:^{

    }];
}

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

UIImage *editedImage = [info objectForKey:UIImagePickerControllerEditedImage];

ALAssetsLibrary* library = [[ALAssetsLibrary alloc] init];
[library writeImageToSavedPhotosAlbum:editedImage.CGImage orientation:(ALAssetOrientation)editedImage.imageOrientation completionBlock:^(NSURL *assetURL, NSError *error )
 {
     NSLog(@"IMAGE SAVED TO PHOTO ALBUM");
     [library assetForURL:assetURL resultBlock:^(ALAsset *asset )
      {
          NSLog(@"we have our ALAsset!");
      }
             failureBlock:^(NSError *error )
      {
          NSLog(@"Error loading asset");
      }];
 }];

Answer 1

只需檢查sourceType ：

if (picker.sourceType == UIImagePickerControllerSourceTypeCamera) {
    // save to library
}

在imagePickerController:didFinishPickingMediaWithInfo:執行此imagePickerController:didFinishPickingMediaWithInfo:方法。