didFinishPickingMediaWithInfo 返回零照片

Question

我正在努力捕获在 4.0 中返回的图像，使用

- (void)imagePickerController:(UIImagePickerController *)picker 
    didFinishPickingMediaWithInfo:(NSDictionary *)info
{
    [[picker parentViewController] dismissModalViewControllerAnimated:YES]; 

    // MediaType can be kUTTypeImage or kUTTypeMovie. If it's a movie then you
    // can get the URL to the actual file itself. This example only looks for images.
    //   
    NSString* mediaType = [info objectForKey:UIImagePickerControllerMediaType];
    // NSString* videoUrl = [info objectForKey:UIImagePickerControllerMediaURL];

    // Try getting the edited image first. If it doesn't exist then you get the
    // original image.
    //
    if (CFStringCompare((CFStringRef) mediaType,  kUTTypeImage, 0) == kCFCompareEqualTo) {               
        UIImage* picture = [info objectForKey:UIImagePickerControllerEditedImage];
        if (!picture)
            picture = [info objectForKey:UIImagePickerControllerOriginalImage];             

        // **picture is always nil
            // info dictionary count = 1


    }

}

发生的情况是信息字典总是返回一个条目：

{ UIImagePickerControllerMediaType = “公共.图像”;

这很棒，但从来没有图像。

我使用了这个论坛上的一个很好的例子来做到这一点，我很确定调用是正确的，但从来没有图像。

提前致谢！

Answer 1

我知道这已经是几个月后的事了，但我为此苦苦挣扎了几个小时，并在这个网站和 iphonedevsdk.com 上发现了同样的问题，但从未找到有效的答案。

总而言之，如果图像是从相机胶卷/照片库中选取的，则它工作得很好，但如果图像是用相机拍摄的新照片，则它永远不会工作。好吧，以下是如何让它同时适用于两者：

在尝试对信息字典执行任何操作之前，您必须关闭并释放 UIImagePickerController。非常清楚：

这不起作用：

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

          // No good with the edited image (if you allowed editing)
  myUIImageView.image = [info objectForKey:UIImagePickerControllerEditedImage];
          // AND no good with the original image
  myUIImageView.image = [info objectForKey:UIImagePickerControllerOriginalImage];
          // AND no doing some other kind of assignment
  UIImage *myImage = [info objectForKey:UIImagePickerControllerEditedImage];

  [picker dismissModalViewControllerAnimated:YES];
  [picker release];
}

在所有这些情况下，图像都将为零。

然而，通过首先释放 UIImagePickerController 的魔力...

这确实有效：

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

  [picker dismissModalViewControllerAnimated:YES];
  [picker release];

          // Edited image works great (if you allowed editing)
  myUIImageView.image = [info objectForKey:UIImagePickerControllerEditedImage];
          // AND the original image works great
  myUIImageView.image = [info objectForKey:UIImagePickerControllerOriginalImage];
          // AND do whatever you want with it, (NSDictionary *)info is fine now
  UIImage *myImage = [info objectForKey:UIImagePickerControllerEditedImage];
}

非常简单，但仅此而已。

Answer 2

虽然 Matthew Frederick 的答案最受欢迎并且长期以来一直是适当的回应，但从 iOS 5.0 开始，苹果提供了 dismissViewControllerAnimated:completion: 来替换现已弃用的（从 iOS 6.0 开始）dismissViewControllerAnimated ：。

在完成块中执行图像信息字典检索应该对所有人都更有意义。

以上面的例子为例，现在看起来像：

- (void)    imagePickerController:(UIImagePickerController *)picker 
    didFinishPickingMediaWithInfo:(NSDictionary *)info 
{
    [picker dismissViewControllerAnimated:YES completion:^{
          // Edited image works great (if you allowed editing)
        myUIImageView.image = [info objectForKey:UIImagePickerControllerEditedImage];
          // AND the original image works great
        myUIImageView.image = [info objectForKey:UIImagePickerControllerOriginalImage];
          // AND do whatever you want with it, (NSDictionary *)info is fine now
        UIImage *myImage = [info objectForKey:UIImagePickerControllerEditedImage];
    }];
}

Answer 3

我已经尝试了上述所有方法，但在 iPad 6.0/6.1 模拟器上没有运气，但是我发现信息包含“UIImagePickerControllerReferenceURL”键，这是我的代码：

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info {
  [picker dismissViewControllerAnimated:YES completion:NULL];

  UIImage* image = [info objectForKey:UIImagePickerControllerOriginalImage];
  if(NULL == image){
      [MyImageLoader loadImageFromAssertByUrl:[info objectForKey:@"UIImagePickerControllerReferenceURL"]
                                   completion:^(UIImage* img){
                                        //img not null here
                                   }];
  }else{
      //image not null here
  }
}

loadImageFromAssertByUrl 的代码是：

+(void) loadImageFromAssertByUrl:(NSURL *)url completion:(void (^)(UIImage*)) completion{
  ALAssetsLibrary *assetLibrary=[[ALAssetsLibrary alloc] init];
  [assetLibrary assetForURL:url resultBlock:^(ALAsset *asset) {
      ALAssetRepresentation *rep = [asset defaultRepresentation];
      Byte *buffer = (Byte*)malloc(rep.size);
      NSUInteger buffered = [rep getBytes:buffer fromOffset:0.0 length:rep.size error:nil];
      NSData *data = [NSData dataWithBytesNoCopy:buffer length:buffered freeWhenDone:YES];
      UIImage* img = [UIImage imageWithData:data];
      completion(img);
  } failureBlock:^(NSError *err) {
      NSLog(@"Error: %@",[err localizedDescription]);
  }];
}

Answer 4

某些版本的 XCode 和 Mountain Lion 还存在一个已知错误。检查您的控制台是否有以下消息：

2013-01-17 21:36:34.946 3sure-ios[5341:1803] 未找到命名服务“com.apple.PersistentURLTranslator.Gatekeeper”。 assetd 已关闭或配置错误。事情不会按照您期望的方式工作。

如果出现该消息，它可能不会工作。在实际的 iOS 设备上检查您的应用程序。

尽管如此，重新启动模拟器和 XCode 似乎可以解决该问题。

Answer 5

我有同样的症状，但就我而言，结果证明我在 UIImagePickerController 层次结构中的某个类别上覆盖了“uuid”或“setUUID”？我猜 CoreData 需要这些方法，否则它会变得非常非常混乱，而资源库都是 CoreData 的东西。

Answer 6

使用

[[UIImagePickerController alloc] init];

而不是

[[UIImagePickerController alloc] initWithNibName:(NSString *) bundle:(NSBundle *)];

Answer 7

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

    [picker dismissViewControllerAnimated:YES completion:NULL];
    //Image picker for nil value 
    UIImage* selectedImage = [info objectForKey:UIImagePickerControllerOriginalImage];
    NSLog(@"my Info :: %@", info);

    if(NULL == selectedImage){
      UIImage * selectedImage =  [PhotoViewController loadImageFromAssertByUrl:[info objectForKey:@"UIImagePickerControllerReferenceURL"]
                                     completion:^(UIImage * selectedImage){
                                         //img not null here
                                         NSLog(@"img2 ::: %@", selectedImage);
                                         uploadImg.image = selectedImage;
                                         [self.view addSubview:PermissionView];
                                     }];
    }else{
        //image not null here
        NSLog(@"Up IMG00 :: %@", uploadImg.image);
        NSLog(@"Sel IMG00 :: %@", selectedImage);
        uploadImg.image = [selectedImage retain];
        NSLog(@"Up IMG22 :: %@", uploadImg.image);
        NSLog(@"Sel IMG22 :: %@", selectedImage);

    }
}


+(UIImage *) loadImageFromAssertByUrl:(NSURL *)url completion:(void (^)(UIImage*)) completion{


    __block UIImage* img;

    ALAssetsLibrary *assetLibrary=[[ALAssetsLibrary alloc] init];

    [assetLibrary assetForURL:url resultBlock:^(ALAsset *asset) {
        ALAssetRepresentation *rep = [asset defaultRepresentation];
        Byte *buffer = (Byte*)malloc(rep.size);
        NSUInteger buffered = [rep getBytes:buffer fromOffset:0.0 length:rep.size error:nil];
        NSData *data = [NSData dataWithBytesNoCopy:buffer length:buffered freeWhenDone:YES];
        img = [UIImage imageWithData:data];
        completion(img);
        NSLog(@"img ::: %@", img);
    } failureBlock:^(NSError *err) {
        NSLog(@"Error: %@",[err localizedDescription]);
    }];

    return img;
}

Answer 8

需要遵循以下步骤：
1）制作UIActionSheet
2) 选择必要的源类型 - 加载资源
3) didFinishPickingMediaWithInfo - 从收到的图像字典中设置图像

    - (IBAction)actionButtonUpload:(id)sender {

             UIActionSheet *actionSheet = [[UIActionSheet alloc] initWithTitle:nil delegate:self 

cancelButtonTitle:@"Cancel" destructiveButtonTitle:nil otherButtonTitles:@"Camera",@"Photo Library", nil];

         [actionSheet showInView:self.view];

    }

    #pragma mark -- UIActionSheet Delegate
    -(void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex{

        UIImagePickerController *picker = [[UIImagePickerController alloc] init];

        picker.delegate = self;
        picker.allowsEditing = YES;
        UIAlertView *alert;


        switch (buttonIndex) {
            case 0:
                if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) {

                    NSLog(@"No camera!");
                    picker.sourceType = UIImagePickerControllerSourceTypeCamera;
                    [self presentViewController:picker animated:YES completion:NULL];


                } else {

                    alert = [[UIAlertView alloc]initWithTitle:@"Alumnikonnect" message:@"Camera is not available, please select a different media" delegate:nil cancelButtonTitle:@"Ok" otherButtonTitles:nil];

                    [alert show];

                }
                break;
            case 1:

                if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypePhotoLibrary]) {

                    picker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
                    [self presentViewController:picker animated:YES completion:NULL];


                } else {

                    alert = [[UIAlertView alloc]initWithTitle:@"Alumnikonnect" message:@"Photolibrary is not available, please select a different media" delegate:nil cancelButtonTitle:@"Ok" otherButtonTitles:nil];

                    [alert show];

                }

                break;

        }

    }


    #pragma mark - Image picker delegate

    - (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
    {
          self.imageEventPic.layer.cornerRadius =   self.imageEventPic.frame.size.height /2;
          self.imageEventPic.layer.masksToBounds = YES;
          self.imageEventPic.layer.borderWidth = 0;
          self.imageEventPic.layer.borderWidth = 1.0f;
          self.imageEventPic.layer.borderColor = [UIColor colorWithRed:0.212 green:0.255 blue:0.302 alpha:1.000].CGColor;


        self.labelUploadPic.hidden = YES;

        self.imageEventPic.image =  info[UIImagePickerControllerOriginalImage];

        [self dismissViewControllerAnimated:YES completion:NULL];

    }


    - (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker
    {
        [self dismissViewControllerAnimated:YES completion:NULL];

    }

    -(UIImage*)imageWithImage:(UIImage*)image
                 scaledToSize:(CGSize)newSize;
    {
        UIGraphicsBeginImageContext( newSize );

        [image drawInRect:CGRectMake(0,0,newSize.width,newSize.height)];

        UIImage* newImage = UIGraphicsGetImageFromCurrentImageContext();

        UIGraphicsEndImageContext();

        return newImage;

    }