关于NSJSONReadingOptions参数的含义

2022-05-05 00:22:11

AFHTTPRequestOperation *operation = [[AFHTTPRequestOperation alloc] initWithRequest:request];
    [operation start];

    NSLog(@"request======%@",request);

    [operation setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject)
     {

//         NSJSONReadingMutableContainers = (1UL << 0),
//         NSJSONReadingMutableLeaves = (1UL << 1),
//         NSJSONReadingAllowFragments = (1UL << 2)

         NSData *data=(NSData *)responseObject;
         NSError *error=nil;
         NSDictionary *dicData1=[NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableContainers error:&error ];
         NSDictionary *dicData2=[NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableLeaves error:&error ];
         NSDictionary *dicData3=[NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingAllowFragments error:&error ];

         NSLog(@"解析成功＝＝＝1＝%@===2==%@====3==%@",dicData1,dicData2,dicData3);

     } failure:^(AFHTTPRequestOperation *operation, NSError *error)
     {
               NSLog(@"解析失败  ＝＝＝＝%@",error);
     }];

代码输出没有多大区别，我的英文不太好，看苹果官方文档上说，
似乎是第一个给数组或字典，第二选项为可变字符，第三项为不属于数组、字典。接收。

NSJSONReadingMutableContainers
Specifies that arrays and dictionaries are created as mutable objects.    //  创建可变的数组或字典接收

NSJSONReadingMutableLeaves
Specifies that leaf strings in the JSON object graph are created as instances of NSMutableString.   // 指定在JSON对象可变字符串被创建为NSMutableString的实例

NSJSONReadingAllowFragments
Specifies that the parser should allow top-level objects that are not an instance of NSArray or NSDictionary   //  指定解析器应该允许不属于的NSArray或NSDictionary中的实例顶层对象

可是我测试的每一项都用字典接收，系统也没有给我报错。难道这是给返回的data类型有关，如果返回的是字典或数组，就用第一项

如有误，请指正。

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