UI进阶之数据解析(网络请求NSURLSession)

POST:

- (IBAction)post:(id)sender {
   
    NSURLSession *session = [NSURLSession sharedSession];
    
    NSString *urlString = @"http://ipad-bjwb.bjd.com.cn/DigitalPublication/publish/Handler/APINewsList.ashx";
    
    NSURL *url = [NSURL URLWithString:urlString];
    
    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];
    
    NSString *dataString = @"date=20131129&startRecord=1&len=5&udid=1234567890&terminalType=Iphone&cid=213";
    
    NSData *potaData = [dataString dataUsingEncoding:NSUTF8StringEncoding];
    
    [request setHTTPMethod:@"POST"];
    [request setHTTPBody:potaData];
    
    NSURLSessionTask *task = [session dataTaskWithRequest:request completionHandler:^(NSData * _Nullable data, NSURLResponse * _Nullable response, NSError * _Nullable error) {
       
        if (error == nil) {
            
            NSDictionary *dic = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingAllowFragments error:nil];
            NSLog(@"dic == %@", dic);
        }
        
        
    }];
    
    [task resume];
    
}

GET:

    //使用block回调方式
    //使用系统提供的全局NSURLSession对象 ,是一个单例
    NSURLSession *session = [NSURLSession sharedSession];
    
    //创建地址字符串(不要放空格)
    
    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";
    
    //统一资源定位符
    NSURL *url = [NSURL URLWithString:urlString];
    
    //NSURLSession 是基于任务的,所以所有的东西都要放到任务里面, NSURLSessionTask就是NSURLSession的任务执行对象
    NSURLSessionTask *task = [session dataTaskWithURL:url completionHandler:^(NSData * _Nullable data, NSURLResponse * _Nullable response, NSError * _Nullable error) {
       
        if (error == nil) {
            NSDictionary *dic = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingAllowFragments error:nil];
            
            NSLog(@"dic == %@", dic);
            
        }
        
    }];
    
    //NSURLSession 的所有任务默认是挂起的,所以一定要调用resume方法,让任务开始
    
      //[task resume];

//NSURLSessionDataDelegate  NSURLSession获取网络数据的代理协议
@interface ViewController ()<NSURLSessionDataDelegate>

//保存结果的data
@property (nonatomic, strong) NSMutableData *resultData;

@end


POST: 
- (IBAction)post:(id)sender {
NSURL *url = [NSURL URLWithString:@"http://ipad-bjwb.bjd.com.cn/DigitalPublication/publish/Handler/APINewsList.ashx"];
    
    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];
    
        NSString *dataString = @"date=20131129&startRecord=1&len=5&udid=1234567890&terminalType=Iphone&cid=213";
    
        NSData *potaData = [dataString dataUsingEncoding:NSUTF8StringEncoding];
    
        [request setHTTPMethod:@"POST"];
        [request setHTTPBody:potaData];

    NSURLSession *session = [NSURLSession sessionWithConfiguration:[NSURLSessionConfiguration defaultSessionConfiguration] delegate:self delegateQueue:[NSOperationQueue mainQueue]];
    
    NSURLSessionDataTask *dataTask = [session dataTaskWithRequest:request];
    
    [dataTask resume];
    
}


GET:

- (IBAction)get:(id)sender {
 //NSURLSession代理的异步操作
    
    //NSURLSession 代理人属性是只读的
    //第一个参数: 会话模式
    //第二个参数: 代理人
    //第三个参数: 代理方法在哪个线程中进行
    NSURLSession *session = [NSURLSession sessionWithConfiguration:[NSURLSessionConfiguration defaultSessionConfiguration ] delegate:self delegateQueue:[NSOperationQueue mainQueue]];
    
    
    NSURL *url = [NSURL URLWithString:@"http://ipad-bjwb.bjd.com.cn/DigitalPublication/publish/Handler/APINewsList.ashx?date=20131129&startRecord=1&len=5&udid=1234567890&terminalType=Iphone&cid=213"];
    
    //NSURLSessionTask 的子类对象
    NSURLSessionDataTask *dataTask = [session dataTaskWithURL:url];
    
    [dataTask resume];
     
}

//代理实现的方法
//服务器开始响应
- (void)URLSession:(NSURLSession *)session dataTask:(nonnull NSURLSessionDataTask *)dataTask didReceiveResponse:(nonnull NSURLResponse *)response completionHandler:(nonnull void (^)(NSURLSessionResponseDisposition))completionHandler
{
    // NSURLSession 的代理协议里面 必须设置允许继续请求 才会继续的响应服务器 获取到数据
    completionHandler(NSURLSessionResponseAllow);
    self.resultData = [NSMutableData data];
    
    
    
}

//接收数据
- (void)URLSession:(NSURLSession *)session dataTask:(nonnull NSURLSessionDataTask *)dataTask didReceiveData:(nonnull NSData *)data
{
    
    [self.resultData appendData:data];
    
    
    
}
//结束响应
- (void)URLSession:(NSURLSession *)session task:(NSURLSessionTask *)task didCompleteWithError:(NSError *)error
{
    
    if (error == nil) {
        
        NSDictionary *dic = [NSJSONSerialization JSONObjectWithData:self.resultData options:NSJSONReadingAllowFragments error:nil];
        
        NSLog(@"dic == %@", dic);
    }
    
    
}