iOS_网络请求_代理方式

#pragma mark - 网络请求代理方式（异步）
- (IBAction)DelegateButtonDidClicked:(UIButton *)sender {

// 1、拼接 urlString,网址里面必须写 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、根据字符串创建 URL(统一资源定位符)
NSURL *url = [NSURL URLWithString:urlString];

// 3、根据 url 创建 request 请求类的对象
NSURLRequest *request = [NSURLRequest requestWithURL:url];

// 4、请求数据（代理回调方式）遵守代理 <NSURLConnectionDataDelegate>
[NSURLConnection connectionWithRequest:request delegate:self];
}

#pragma mark | 客户端收到服务器的响应
- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response
{
// 只执行一次
// 初始化 receiveData 对象
self.receiveData = [NSMutableData data];
}

#pragma mark | 客户端收数据(并非一次性全部拿到)
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
{
// 每次返回的都是新数据
// 拼接数据(请求一点 拼接一点)
[self.receiveData appendData:data];
}

#pragma mark | 客户端接收数据完毕
- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{
// 解析数据
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);
}
}

#pragma mark | 网络请求失败
- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error
{
NSLog(@"%@", error);
}