iOS开发-NSURLConnection（通过代理方法发送GET请求）

通过代理实现网络请求@interface ViewController ()

-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
    //1.确定请求路径
    NSURL *url = [NSURL URLWithString:@"http://120.25.226.186:32812/login?username=123&pwd=123&type=JSON"];
    
    //2.创建请求对象
    NSURLRequest *request = [NSURLRequest requestWithURL:url];
    
    //3.设置代理,发送请求（三种实现的方式、根据实际开发需求选择）
    //3.1
    //[NSURLConnection connectionWithRequest:request delegate:self];
    
    //3.2
    //[[NSURLConnection alloc]initWithRequest:request delegate:self];
    
    //3.3 设置代理,时候发送请求需要检查startImmediately的值
    //(startImmediately == YES 会发送 | startImmediately == NO 则需要调用start方法)
    NSURLConnection * connect = [[NSURLConnection alloc]initWithRequest:request delegate:self startImmediately:NO];
    
    //调用开始方法
    [connect start];
    
//    [connect cancel];//取消
}

#pragma mark ----------------------
#pragma mark NSURLConnectionDataDelegate
//1.当接收到服务器响应的时候调用
-(void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response
{
    NSLog(@"%s",__func__);
}

//2.接收到服务器返回数据的时候调用,调用多次
-(void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
{
     NSLog(@"%s",__func__);
    
    //拼接数据
    [self.resultData appendData:data];
}
//3.当请求失败的时候调用
-(void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error
{
     NSLog(@"%s",__func__);
}

//4.请求结束的时候调用
-(void)connectionDidFinishLoading:(NSURLConnection *)connection
{
     NSLog(@"%s",__func__);
    
    NSLog(@"%@",[[NSString alloc]initWithData:self.resultData encoding:NSUTF8StringEncoding]);
}