当对象具有内部对象时如何将对象转换为 JSON

Posted 2023-03-15

【中文标题】当对象具有内部对象时如何将对象转换为 JSON

【英文标题】：How to convert object to JSON when object have inner object

【发布时间】：2014-01-24 10:55:45

【问题描述】：

我有自定义类对象，其中包含用户对象：

@interface Order : NSObject

@property (nonatomic, retain) NSString *OrderId;
@property (nonatomic, retain) NSString *Title;
@property (nonatomic, retain) NSString *Weight;
@property (nonatomic, retain) User *User
- (NSMutableDictionary *)toNSDictionary;
...
- (NSMutableDictionary *)toNSDictionary


    NSMutableDictionary *dictionary = [[NSMutableDictionary alloc] init];
    [dictionary setValue:self.OrderId forKey:@"OrderId"];
    [dictionary setValue:self.Title forKey:@"Title"];
    [dictionary setValue:self.Weight forKey:@"Weight"];

    return dictionary;

在toNSDictinary 函数中我没有映射User 对象。 在这种情况下，将对象转换为 nsdictionary 的好方法是什么？

【问题讨论】：

把你的问题说清楚

【参考方案1】：

修改你的toNSDictionary 方法：

- (NSMutableDictionary *)toNSDictionary


    NSMutableDictionary *dictionary = [[NSMutableDictionary alloc] init];
    [dictionary setValue:self.OrderId forKey:@"OrderId"];
    [dictionary setValue:self.Title forKey:@"Title"];
    [dictionary setValue:self.Weight forKey:@"Weight"];

    NSMutableDictionary *userDictionary = [NSMutableDictionary dictionary];
    [userDictionary setValue:self.User.someProperty1 forKey:@"someProperty1"];
    [userDictionary setValue:self.User.someProperty2 forKey:@"someProperty2"];
    [dictionary setValue:userDictionary forKey:@"User"];

    return dictionary;

【参考方案2】：

- (NSMutableDictionary *)toNSDictionary


NSMutableDictionary *dictionary = [[NSMutableDictionary alloc] init];
[dictionary setValue:self.OrderId forKey:@"OrderId"];
[dictionary setValue:self.Title forKey:@"Title"];
[dictionary setValue:self.Weight forKey:@"Weight"];

NSMutableDictionary *userDictionary = [NSMutableDictionary dictionary];
[userDictionary setValue:self.User.someProperty1 forKey:@"someProperty1"];
[userDictionary setValue:self.User.someProperty2 forKey:@"someProperty2"];
[dictionary setObject:userDictionary forKey:@"User"];

return dictionary;

在为键设置字典时尝试使用

[dictionary   setObject: forKey: ]