#pragma mark - 網絡請求代理方式（異步）
- (IBAction)DelegateButtonDidClicked:(UIButton *)sender {

    // 1、拼接 urlString,網址裡面必須寫 http://
    NSString *urlString = @http://ipad-bjwb.bjd.com.cn/DigitalPublication/publish/Handler/APINewsList.ashx?date=20131129&startRecord=1&len=5&udid=1234567890&terminalType=Iphone&cid=213;

    // 2、根據字符串創建 URL(統一資源定位符)
    NSURL *url = [NSURL URLWithString:urlString];

    // 3、根據 url 創建 request 請求類的對象
    NSURLRequest *request = [NSURLRequest requestWithURL:url];

    // 4、請求數據（代理回調方式）遵守代理 
    [NSURLConnection connectionWithRequest:request delegate:self];
}

代理方法
客戶端收到服務器的響應

#pragma mark | 客戶端收到服務器的響應
- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response
{
    // 只執行一次
    // 初始化 receiveData 對象
    self.receiveData = [NSMutableData data];
}

客戶端收數據(並非一次性全部拿到)

#pragma mark | 客戶端收數據(並非一次性全部拿到)
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
{
    // 每次返回的都是新數據
    // 拼接數據(請求一點 拼接一點)
    [self.receiveData appendData:data];
}

客戶端接收數據完畢

#pragma mark | 客戶端接收數據完畢
- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{
    // 解析數據
    NSDictionary *dict = [NSJSONSerialization JSONObjectWithData:self.receiveData options:(NSJSONReadingMutableContainers) error:nil];


    NSArray *array = dict[@news];

    self.newsArray = [NSMutableArray array];

    for (NSDictionary *smallDict in array) {
        NewsModal *modal = [[NewsModal alloc] init];
        [modal setValuesForKeysWithDictionary:smallDict];
        [self.newsArray addObject:modal];
    }

    for (NewsModal *modal in self.newsArray) {
        NSLog(@%@, modal.title);
    }
}

網絡請求失敗

#pragma mark | 網絡請求失敗
- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error
{
    NSLog(@%@, error);
}