如何使用AFNetworking AFHTTPRequestOperationManager显示ProgressBar [英] How to show ProgressBar With AFNetworking AFHTTPRequestOperationManager

问题描述

我正在尝试显示进度条，因为我从网址下载了JSON。 JSON正在正确下载，但我不确定如何显示进度条。我尝试过使用 UIProgressView 但它没有显示在屏幕上。任何建议都将不胜感激。

I am trying to show the Progress Bar as I download a JSON from a url. The JSON is downloading correctly but I am not sure how to show the Progress Bar. I have tried using UIProgressView but it does not display on the screen. Any suggestions would be appreciated.

CGFloat width = [UIScreen mainScreen].bounds.size.width;
CGFloat height = [UIScreen mainScreen].bounds.size.height;

CGRect rect = CGRectMake(width/2, height/2, width/5, height/5);
UIProgressView *myProgressView = [[UIProgressView alloc]initWithFrame:rect];
myProgressView.progressViewStyle = UIProgressViewStyleBar;
[self.view addSubview:myProgressView];

AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];    
[manager GET:@"https:urlWithJson" parameters:nil success:^(AFHTTPRequestOperation *operation, id responseObject) {
      [operation setDownloadProgressBlock:^(NSUInteger bytesRead, long long totalBytesRead, long long totalBytesExpectedToRead)
       {
           myProgressView.progress = (float)totalBytesRead / totalBytesExpectedToRead;
       }];
      [operation setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject) {
          NSLog(@"operation Completed");
      } failure:^(AFHTTPRequestOperation *operation, NSError *error) {
          NSLog(@"ERROR");
      }];

      [operation start];
  } failure:^(AFHTTPRequestOperation *operation, NSError *error) {
      NSLog(@"timeout Error: %@", error);
  }];

推荐答案

在成功中设置download-progress-block块，这有点太晚了;）

You set the download-progress-block inside the success block, which is a bit too late ;)

试试这个：

AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];    
AFHTTPRequestOperation *operation = [manager GET:@"https:urlWithJson" parameters:nil success:^(AFHTTPRequestOperation *operation, id responseObject) {
    NSLog(@"Complete");
} failure:^(AFHTTPRequestOperation *operation, NSError *error) {
    NSLog(@"Error: %@", error);
}];

[operation setDownloadProgressBlock:^(NSUInteger bytesRead, long long totalBytesRead, long long totalBytesExpectedToRead) {
    myProgressView.progress = (float)totalBytesRead / totalBytesExpectedToRead;
}];

这篇关于如何使用AFNetworking AFHTTPRequestOperationManager显示ProgressBar的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！