ios 请求数据的进度

 

 

第一个方法是 数据的总进度。

第二个方法是 数据的下载进度。

 

 

- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response{

    NSHTTPURLResponse *httpResponse = (NSHTTPURLResponse *)response;

    if(httpResponse && [httpResponse respondsToSelector:@selector(allHeaderFields)]){

        NSDictionary *httpResponseHeaderFields = [httpResponse allHeaderFields];

        

        double total_ = [[httpResponseHeaderFields objectForKey:@"Content-Length"] longLongValue];

        

        NSLog(@"%f", total_);

    }

}

#pragma mark NSURLConnection (delegate)

- (void)connection:(NSURLConnection *)aConnection didReceiveData:(NSData *)data

 

{

    [imageData appendData:data];

    double a = [imageData length];

    double total = [data length];//总大小还不知道

    

    NSLog(@"这里是加载数据的过程");

    NSLog(@"当前数据长度为 = %f", a);

    

//    [imageData appendData:data];

}