iPhone - 从网络服务器获取文件的最后修改日期

Question

我想检查网络服务器上文件的最后修改日期。任何帮助都会很棒。谢谢。

Answer 1

NSURLRequest *request = [[NSURLRequest alloc] initWithURL:aURL];
NSHTTPURLResponse *response;
[NSURLConnection sendSynchronousRequest:request                 returningResponse:&response error:nil];
if( [response respondsToSelector:@selector( allHeaderFields )] )
{
    NSDictionary *metaData = [response allHeaderFields];
    NSString *lastModifiedString = [metaData objectForKey:@"Last-Modified"];
}