iphone - 如何在 iPhone 中增加进度视图，直到来自服务器的 JSON 形式的响应

Question

我是 iPhone 开发的新手，想在我的应用程序中添加进度视图，有人可以帮助我如何在我的 iPhone 应用程序中添加进度视图，以及当服务器响应以 json 形式出现时，这个进度视图将如何逐渐增加。

Answer 1

这是使用 mbprogesshud 的示例代码，希望您也可以通过此方法设置您的进度视图的进度。参考 nsurldelegate 方法他们如何根据来自服务器的数据设置进度

  - (IBAction)showWIthLabelAnnularDeterminate:(id)sender {
        HUD = [[MBProgressHUD alloc] initWithView:self.navigationController.view];
        [self.navigationController.view addSubview:HUD];

        // Set determinate mode
        HUD.mode = MBProgressHUDModeAnnularDeterminate;

        HUD.delegate = self;
        HUD.labelText = @"Loading";

        // myProgressTask uses the HUD instance to update progress
        [HUD showWhileExecuting:@selector(myProgressTask) onTarget:self withObject:nil animated:YES];
    }



    #pragma mark -
    #pragma mark NSURLConnectionDelegete

    - (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response {
        expectedLength = [response expectedContentLength];
        currentLength = 0;
        HUD.mode = MBProgressHUDModeDeterminate;
    }

    - (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {
        currentLength += [data length];
        HUD.progress = currentLength / (float)expectedLength;
    }

    - (void)connectionDidFinishLoading:(NSURLConnection *)connection {
        HUD.customView = [[[UIImageView alloc] initWithImage:[UIImage imageNamed:@"37x-Checkmark.png"]] autorelease];
        HUD.mode = MBProgressHUDModeCustomView;
        [HUD hide:YES afterDelay:2];
    }

    - (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error {
        [HUD hide:YES];
    }