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將照片從iPhone應用程序上傳到Rails服務器

[英]Upload Photo from iphone app to rails server

我正在構建一個iPhone應用程序,該應用程序允許用戶將照片上傳到Rails支持的Web服務。 我正在設備上測試該應用程序,並且可以拍照然后將其發布-但是photoData返回為null。 這是創建帖子后的xcode日志:

post =     {
        content = Test;
        "created_at" = "2013-08-02T19:15:05Z";
        id = 2;
        photo =         {
            thumb =             {
                url = "<null>";
            };
            "thumb_retina" =             {
                url = "<null>";
            };
            url = "<null>";
        };
    };
    success = 1;
}

我實際上缺少將數據發布到服務器的實現?

在鐵軌方面,我使用的是carrierwave和miniMagick作為上傳器,並使用:fog存儲將所有內容保存到S3。 (至少這是目標,但那沒有實現。)我的帖子模型具有以下屬性:

@property (nonatomic, strong) NSString *content;
@property (nonatomic, strong) NSString *thumbnailUrl;
@property (nonatomic, strong) NSString *largeUrl;
@property (nonatomic, strong) NSData *photoData;

保存方法是這樣的:

- (void)saveWithProgressAtLocation:(CLLocation *)location
                         withBlock:(void (^)(CGFloat))progressBlock completion:(void (^)(BOOL, NSError *))completionBlock {

    if (!self.content) self.content = @"";

    NSDictionary *params = @{
                             @"post[content]" : self.content,

                             };

    NSURLRequest *postRequest = [[APIClient sharedClient] multipartFormRequestWithMethod:@"POST"
                                                                                    path:@"/posts"
                                                                              parameters:params
                                                               constructingBodyWithBlock:^(id<AFMultipartFormData> formData)
                                  {
                                      [formData appendPartWithFileData:self.photoData
                                                                  name:@"post[photo]"
                                                              fileName:@""
                                                              mimeType:@"image/png"];
                                  }];
    AFHTTPRequestOperation *operation = [[AFJSONRequestOperation alloc] initWithRequest:postRequest];
    [operation setUploadProgressBlock:^(NSUInteger bytesWritten, long long totalBytesWritten, long long totalBytesExpectedToWrite) {
        CGFloat progress = ((CGFloat)totalBytesWritten) / totalBytesExpectedToWrite;
        progressBlock(progress);
    }];

    [operation setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject) {
        if (operation.response.statusCode == 200 || operation.response.statusCode == 201) {
            NSLog(@"Created, %@", responseObject);
            NSDictionary *updatedPost = [responseObject objectForKey:@"post"];
            [self updateFromJSON:updatedPost];
            [self notifyCreated];
            completionBlock(YES, nil);
        } else {
            completionBlock(NO, nil);
        }
    } failure:^(AFHTTPRequestOperation *operation, NSError *error) {
        completionBlock(NO, error);
    }];

    [[APIClient sharedClient] enqueueHTTPRequestOperation:operation];
}

在photoViewController中被稱為onSave的實際方法是這樣的:

- (void)save:(id)sender {

    Post *post = [[Post alloc] init];
    post.content = self.contentTextField.text;
    post.photoData = UIImagePNGRepresentation(self.imageView.image);

    [self.view endEditing:YES];

    ProgressView *progressView = [ProgressView presentInWindow:self.view.window];
    if (location) {
        [post saveWithProgressAtLocation:self.locationManager.location withBlock:^(CGFloat progress) {
            [progressView setProgress:progress];
        } completion:^(BOOL success, NSError *error) {
            [progressView dismiss];
            if (success) {
                [self.navigationController popViewControllerAnimated:YES];
            } else {
                NSLog(@"ERROR: %@", error);
            }
        }];
 }

問題是photoData沒有保存到服務器。 有什么想法嗎?

最初,我在rails中有一個預編譯的默認照片:assets / images / nophoto.png-但是每次我拍照時,該默認照片都會覆蓋新照片並發布,這顯然不是我想要的。 所以我刪除了它,現在我得到的是空值。 有任何想法嗎?

將圖像轉換為數據,然后編碼為Base64字符串,將該字符串保存在服務器中,然后從服務器檢索時,將Base64字符串解碼為數據,並使用[UIImage imageWithData: data];

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