JSON解析--原生&AFN

#pragma mark 原生加载JSON
- (void)loadJSON
{
    // 1. NSURL
    NSURL *url = [NSURL URLWithString:@""];
    
    // 2. NSURLRequest
    NSURLRequest *request = [NSURLRequest requestWithURL:url];
    
    // 3. NSURLConnection
    [NSURLConnection sendAsynchronousRequest:request queue:[NSOperationQueue mainQueue] completionHandler:^(NSURLResponse *response, NSData *data, NSError *connectionError) {
        
        if (connectionError != nil) {
            NSLog(@"%@", connectionError.localizedDescription);
        } else {
            NSError *error = nil;
            
            NSArray *array = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingAllowFragments error:&error];
            
            if (error != nil) {
                NSLog(@"%@", error.localizedDescription);
            } else {
                NSLog(@"%@", array);
            }
        }
    }];
}
#pragma mark AFN加载JSON
- (void)loadJSON
{
    // 1. NSURLRequest
    NSURLRequest *request = [_httpClient requestWithMethod:@"GET" path:@"videos.php?format=json" parameters:nil];
    
    // 2. 连接
    AFJSONRequestOperation *op = [AFJSONRequestOperation JSONRequestOperationWithRequest:request success:^(NSURLRequest *request, NSHTTPURLResponse *response, NSArray *JSON) {
        
        // 成功之后，直接使用反序列化出来的结果即可。
        NSLog(@"%@", JSON);
    } failure:^(NSURLRequest *request, NSHTTPURLResponse *response, NSError *error, id JSON) {
        // 1> 网络访问获取数据出错
        // 2> JSON的反序列化出错
        
        NSLog(@"%@ %@", error, JSON);
    }];
    
    // 3. 将操作添加到队列或者start，操作就会启动
    // 3.1 将操作添加到队列，开始多线程操作
    [_httpClient.operationQueue addOperation:op];
//  [op start];
}