自由手記

原文地址：IPhpne之获取远程网页数据作者：飞舞的鸡毛

 
Load函数:
{
NSURLRequest *request = [[NSURLRequest alloc] initWithURL: url];
 NSURLConnection *connection = [[NSURLConnection alloc]
     initWithRequest:request
     delegate:self];
 [connection release];
 [request release];
}

  当创建完NSURL_Request 和NSURLConnection 之后直接就release了.其原因是当有什么事件需要处理时,对象就自动被唤醒.

// 回调方法
- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response {
 NSLog (@"connectionDidReceiveResponse");
}

//此方法表名  提供一个NSDATA,它封装了刚从连接上收到的字节块
- (void)connection:(NSURLConnection *)connection
     didReceiveData:(NSData *)data {
 NSLog (@"connectionDidReceiveData");
 NSString *newText = [[NSString alloc]
    initWithData:data
    encoding:NSUTF8StringEncoding];
 if (newText != NULL) {
  [self appendTextToView:newText];
  [newText release];
 }
}

//下载已经完成
- (void) connectionDidFinishLoading: (NSURLConnection*) connection {
 [activityIndicator stopAnimating];
}

//下载失败 提供一个提供一个失败的原因
-(void) connection:(NSURLConnection *)connection

    didFailWithError: (NSError *)error {
 UIAlertView *errorAlert = [[UIAlertView alloc]
   initWithTitle: [error localizedDescription]
   message: [error localizedFailureReason]
   delegate:nil
   cancelButtonTitle:@"OK"
   otherButtonTitles:nil];
 [errorAlert show];
 [errorAlert release];
 [activityIndicator stopAnimating];
}