上传图片时如何在iphone中显示进度条

Question

我是 iphone 编程新手。使用下面的代码我在服务器中上传图像和音频，但在上传时如何显示进度条？

-(void)aMethodd:(id)sender
{
      UIActivityIndicatorView *indicator = [[UIActivityIndicatorView alloc]initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleGray];
indicator.frame = CGRectMake(0.0, 0.0, 40.0, 40.0);
indicator.center = self.button.center;
[self.view addSubview:indicator];
[indicator bringSubviewToFront:tempView];
[UIApplication sharedApplication].networkActivityIndicatorVisible = TRUE;
[indicator startAnimating];

    NSString* caption = @"Aslam";
    NSString* imagepath = @"Tauky/image001.jpg";
    NSString* audiopath = @"Tauky/audio001.mp3";
    // NSString* user_id = @"45";
    NSString* user_id=[NSString stringWithFormat:@"45"];
    NSString* mobile_tauky_id = [NSString stringWithFormat:@"2"];

    NSString* blauky_id = @"0";
    NSURL *dataURL=[[NSURL alloc]initWithString:[NSString stringWithFormat:@"http://182.73.152.59:82/php/tauky_services/codeigniter-restserver-master/index.php/api/uploadClass/uploadTauky/"]];
       NSMutableURLRequest *dataRqst = [NSMutableURLRequest requestWithURL:dataURL cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:30.0];

    [dataRqst setHTTPMethod:@"POST"];

    NSString *stringBoundary = @"0xKhTmLbOuNdArY---This_Is_ThE_BoUnDaRyy---pqo";
    NSString *headerBoundary = [NSString stringWithFormat:@"multipart/form-data; boundary=%@",stringBoundary];

    [dataRqst addValue:headerBoundary forHTTPHeaderField:@"Content-Type"];

    NSMutableData *postBody = [NSMutableData data];

    // -------------------- ---- caption ---------------------------\\


    [postBody appendData:[[NSString stringWithFormat:@"--%@\r\n", stringBoundary] dataUsingEncoding:NSUTF8StringEncoding]];
    [postBody appendData:[@"Content-Disposition: form-data; name=\"caption\"\r\n\r\n"
                          dataUsingEncoding:NSUTF8StringEncoding]];

    [postBody appendData:[caption dataUsingEncoding:NSUTF8StringEncoding]];
    [postBody appendData:[@"\r\n" dataUsingEncoding:NSUTF8StringEncoding]];
    //caption
    // -------------------- ---- userId ---------------------------\\

    [postBody appendData:[[NSString stringWithFormat:@"--%@\r\n", stringBoundary] dataUsingEncoding:NSUTF8StringEncoding]];
    [postBody appendData:[@"Content-Disposition: form-data; name=\"user_id\"\r\n\r\n"
                          dataUsingEncoding:NSUTF8StringEncoding]];

    [postBody appendData:[user_id dataUsingEncoding:NSUTF8StringEncoding]];
    [postBody appendData:[@"\r\n" dataUsingEncoding:NSUTF8StringEncoding]];
    NSLog(@"%@",user_id);
    NSLog(@"Hai aslam");

    //asdf
    // -------------------- ---- mobile_tauky_id ---------------------------\\

    [postBody appendData:[[NSString stringWithFormat:@"--%@\r\n", stringBoundary] dataUsingEncoding:NSUTF8StringEncoding]];
    [postBody appendData:[@"Content-Disposition: form-data; name=\"mobile_tauky_id\"\r\n\r\n"
                          dataUsingEncoding:NSUTF8StringEncoding]];

    [postBody appendData:[mobile_tauky_id dataUsingEncoding:NSUTF8StringEncoding]];
    [postBody appendData:[@"\r\n" dataUsingEncoding:NSUTF8StringEncoding]];
    // -------------------- ---- blauky_id ---------------------------\\

    [postBody appendData:[[NSString stringWithFormat:@"--%@\r\n", stringBoundary] dataUsingEncoding:NSUTF8StringEncoding]];
    [postBody appendData:[@"Content-Disposition: form-data; name=\"blauky_id\"\r\n\r\n"
                          dataUsingEncoding:NSUTF8StringEncoding]];

    [postBody appendData:[blauky_id dataUsingEncoding:NSUTF8StringEncoding]];
    [postBody appendData:[@"\r\n" dataUsingEncoding:NSUTF8StringEncoding]];
    // media part

    // -------------------- ---- Image Upload Status ---------------------------\

    [postBody appendData:[[NSString stringWithFormat:@"--%@\r\n", stringBoundary] dataUsingEncoding:NSUTF8StringEncoding]];
    [postBody appendData:[@"Content-Disposition: form-data; name=\"image\"\r\n\r\n"
                          dataUsingEncoding:NSUTF8StringEncoding]];

    NSString *mediaType=@"Image";
    NSLog(@"type %@",mediaType);
    [postBody appendData:[mediaType dataUsingEncoding:NSUTF8StringEncoding]];
    [postBody appendData:[@"\r\n" dataUsingEncoding:NSUTF8StringEncoding]];

    //pass MediaType file

    [postBody appendData:[[NSString stringWithFormat:@"--%@\r\n", stringBoundary] dataUsingEncoding:NSUTF8StringEncoding]];
    [postBody appendData:[@"Content-Disposition: form-data; name=\"image\"; filename=\"image18.png\"\r\n" dataUsingEncoding:NSUTF8StringEncoding]];
    [postBody appendData:[@"Content-Type: image/png\r\n" dataUsingEncoding:NSUTF8StringEncoding]];
    [postBody appendData:[@"Content-Transfer-Encoding: binary\r\n\r\n" dataUsingEncoding:NSUTF8StringEncoding]];
    // get the image data from main bundle directly into NSData object
    UIImage * img = [UIImage imageNamed:@"image18.png"];
    NSData *imageData = UIImagePNGRepresentation(SavedImage1);

    //NSData *imgData = UIImagePNGRepresentation(Your Image);
    // add it to body
    [postBody appendData:imageData];
    [postBody appendData:[@"\r\n" dataUsingEncoding:NSUTF8StringEncoding]];



    // -------------------- ---- Audio Upload Status ---------------------------\

    [postBody appendData:[[NSString stringWithFormat:@"--%@\r\n", stringBoundary] dataUsingEncoding:NSUTF8StringEncoding]];
    [postBody appendData:[@"Content-Disposition: form-data; name=\"image\"\r\n\r\n"
                          dataUsingEncoding:NSUTF8StringEncoding]];

    NSString *mediaTypee=@"tone";
    NSLog(@"type %@",mediaTypee);
    [postBody appendData:[mediaTypee dataUsingEncoding:NSUTF8StringEncoding]];
    [postBody appendData:[@"\r\n" dataUsingEncoding:NSUTF8StringEncoding]];


    [postBody appendData:[[NSString stringWithFormat:@"--%@\r\n", stringBoundary] dataUsingEncoding:NSUTF8StringEncoding]];
    [postBody appendData:[@"Content-Disposition: form-data; name=\"audio\"; filename=\"ch.mp3\"\r\n" dataUsingEncoding:NSUTF8StringEncoding]];
    [postBody appendData:[@"Content-Type: audio/mp3\r\n" dataUsingEncoding:NSUTF8StringEncoding]];
    [postBody appendData:[@"Content-Transfer-Encoding: binary\r\n\r\n" dataUsingEncoding:NSUTF8StringEncoding]];
    // get the image data from main bundle directly into NSData object
    NSString *file2 = [[NSBundle mainBundle] pathForResource:@"ch" ofType:@"mp3"];
    NSData *file1Data = [[NSData alloc] initWithContentsOfFile:mediaPath1];
    //NSData *imgData = UIImagePNGRepresentation(Your Image);
    // add it to body
    [postBody appendData:file1Data];
    [postBody appendData:[@"\r\n" dataUsingEncoding:NSUTF8StringEncoding]];

    // final boundary

   [postBody appendData:[[NSString stringWithFormat:@"--%@--\r\n", stringBoundary] dataUsingEncoding:NSUTF8StringEncoding]];

    // add body to post

    [dataRqst setHTTPBody:postBody];

    NSHTTPURLResponse* response =[[NSHTTPURLResponse alloc] init];
    NSError* error = [[NSError alloc] init] ;

    //synchronous filling of data from HTTP POST response
    NSData *responseData = [NSURLConnection sendSynchronousRequest:dataRqst returningResponse:&response error:&error];

    //convert data into string
    NSString *responseString = [[NSString alloc] initWithBytes:[responseData bytes] length:[responseData length] encoding:NSUTF8StringEncoding];

    NSLog(@"Response String %@",responseString);

}

现在我正在尝试使用活动指示器，但在这里如果单击上传按钮意味着在获得响应后，它会显示活动指示器。我不知道错误是什么。我正在编写该代码，然后它也调用它获取响应表单服务器后的活动指示器。 而且我还得到了一些其他代码，当我下载图像或音频时，我可以使用下面的代码显示进度条。同样，我想在上传时显示进度条。任何人都可以告诉我该怎么做。

  bar = [[UIDownloadBar alloc] initWithURL:[NSURL URLWithString:@"http://182.73.152.59:82/php/tauky_services/codeigniter-restserver-master/uploads/28/Audio/508.mp3"]
                                            progressBarFrame:CGRectMake(40, 25, 200, 20)
                                         timeout:25
                                        delegate:self];

        alert =[[UIAlertView alloc]init];
        lblForDisplay=[[UILabel alloc]initWithFrame:CGRectMake(90, 40, 200, 20)];
        lblForDisplay.backgroundColor=[UIColor clearColor];
        lblForDisplay.text=@"Downloading...";
        lblForDisplay.textColor=[UIColor whiteColor];

        [alert addSubview:lblForDisplay];
        [alert addSubview:bar];
        [alert show];

Answer 1

您应该考虑使用AFNetworking，特别是AFURLConnectionOperation，因为它提供了一个简单的块回调来为您提供进度。

Answer 2

@Wain 写道，有一个很棒的网络库，叫做 AFNetworking，在 GitHub 上寻找它。

这是一个 AFNetworking 示例：

UIProgressView *progressView = [[UIProgressView alloc] initWithFrame:CGRectMake(0, 50, 120, 5)];
//when you have the image convert it to NSData:
NSData *fileData = image?UIImageJPEGRepresentation(image, 1.0):nil

NSURLSessionConfiguration *configuration = [NSURLSessionConfiguration defaultSessionConfiguration];
AFURLSessionManager *manager = [[AFURLSessionManager alloc] initWithSessionConfiguration:configuration];

NSURL *URL = [NSURL URLWithString:@"http://yourURL.com"];
NSURLRequest *request = [NSURLRequest requestWithURL:URL];


NSURLSessionUploadTask *uploadTask = [manager uploadTaskWithRequest:request
                            fromData:fileData
                            progress:^(NSProgress * _Nonnull uploadProgress) {
                                // This is not called back on the main queue.
                                // You are responsible for dispatching to the main queue for UI updates
                                dispatch_async(dispatch_get_main_queue(), ^{
                                    //Update the progress view
                                    [progressView setProgress:uploadProgress.fractionCompleted];                 
                                });
                            }

                   completionHandler:^(NSURLResponse* response, id responseObject, NSError* error) {

                       if (error) {
                           NSLog(@"Error: %@", error);
                       } else {
                           NSLog(@"%@ %@", response, responseObject);
                       }

                   }];

[uploadTask resume];