获取要下载文件的大小信息

原文来自IOS教程网，转载时请注明文章的来源：http://ios.662p.com/thread-1660-1-1.html

NSURLConnectionDataDelegate方法中有：

-(void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response
{
    //This method is called when the server has determined that it 
    //has enough information to create the NSURLResponse.
    
    //It can be called multiple times, for example in the case of a 
    //redirect, so each time we reset the data.
    
    //receivedData is an instance variable declared elsewhere.
    
    NSLog(@"要下载文件大小为 %lld",response.expectedContentLength);
    [self.receivedData setLength:0];
}

　　

1. //在此方法中可以更新进度条 
3. -(void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
4. {
5.     //provide an indication of the connection's progress to the user.
6.     //progressView.progress = [self.receivedData length] / totalSize
8.     [self.receivedData appendData:data];
9. }

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