Question

我有一个简单的NSURLConnection我想获得解析数据进度百分比。这是多少百分比加载。是否可以计算。我试过这个，

-(void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response{
    urlData = [NSMutableData data];
    [urlData setLength:0];
  expectedBytes = [response expectedContentLength];
}

-(void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data{
float progressive = (float)[urlData length] / (float)expectedBytes;
}

这里， expectedBytes获得-1。 json链接正在获取jsonResult。让我知道如何计算加载进度。

Answer 1

使用以下代码。这对您有用，简单易行。

-(void)connection:(NSURLConnection *)connection didReceiveResponse:(NSHTTPURLResponse *)response{
      urlData = [NSMutableData data];
      [urlData setLength:0];
      double expectedBytes = [[[response allHeaderFields] objectForKey:@"Content-Length"] doubleValue];
    }

-(void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data{
      float progressive = (float)[urlData length] / (float)expectedBytes;
}

NSURLConnection以百分比形式接收数据

1 个答案: