iOS Http请求异步请求

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- (void)viewDidLoad
{
[super viewDidLoad];
	// Do any additional setup after loading the view.
_data = [[NSMutableData alloc] init];
// 组合一个搜索字符串
NSString *urlStr = [NSString stringWithFormat:@"http://www.baidu.com/s?wd=%@", @"php"];
NSURL *url = [NSURL URLWithString:urlStr];
NSURLRequest *request = [NSURLRequest requestWithURL:url];
//发起请求,定义代理
[NSURLConnection connectionWithRequest:request delegate:self];
}
// 分批返回数据
- (void)connection:(NSURLConnection *) connection didReceiveData:(NSData *)data {
[_data appendData:data];
NSLog(@"%@", _data);
}
// 数据完全返回完毕
- (void)connectionDidFinishLoading:(NSURLConnection *)connection {
NSString *dataString =  [[NSString alloc] initWithData:_data encoding:NSUTF8StringEncoding];
NSLog(@"%@", dataString);
}

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