iOS开发--服务器返回的数据解析

{"type" : "super", "user_name" : "jack"};
{"user_names" : ["jack", "rose", "jim"]}

SBJson简单用法
NSData *data = nil; 
NSDictionary *dict = [data JSONValue];
// JSON字符串也可以使用此方法
NSDictionary *dict1 = [@"{\"height\": 2}" JSONValue];

// 利用NSJSONSerialization类
+ (id)JSONObjectWithData:(NSData *)data options:(NSJSONReadingOptions)opt error:(NSError **)error;

- (void)parseJSON
// JSON格式化：
{
    // 0.请求路径
    NSURL *url = [NSURL URLWithString:@"http://110.20.256.139:30693/login?username=jack&pwd=superman123"];
    
    // 1.创建请求对象
    NSURLRequest *request = [NSURLRequest requestWithURL:url];
    
    // 2.发送请求
    [NSURLConnection sendAsynchronousRequest:request queue:[[NSOperationQueue alloc] init] completionHandler:^(NSURLResponse *response, NSData *data, NSError *connectionError) {
        /*
         NSJSONReadingMutableContainers
         NSJSONReadingMutableLeaves
         NSJSONReadingAllowFragments
         */
        // 解析JSON
        NSDictionary *dict = [NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:nil];
        // 打印解析出来的结果
        NSLog(@"%@", dict[@"success"]);
        NSLog(@"%@", dict[@"error"]);
       // **** 也可以将服务器返回的字典写成plist文件
[dict writeToFile:@"/Users/leichao/Desktop/video.plist" atomically:YES];
    }];
}

// 利用NSJSONSerialization类
+ (NSData *)dataWithJSONObject:(id)obj options:(NSJSONWritingOptions)opt error:(NSError **)error;

// 将字典转成字符串
// NSJSONWritingPrettyPrinted : 好看的印刷
NSData *date = [NSJSONSerialization dataWithJSONObject:@{@"name" : @"jack"} options:NSJSONWritingPrettyPrinted error:nil];
NSString *str = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];

[dict writeToFile:@"/Users/leichao/Desktop/video.plist" atomically:YES];