当对象具有内部对象时如何将对象转换为 JSON答案

【问题标题】：How to convert object to JSON when object have inner object当对象具有内部对象时如何将对象转换为 JSON
【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

标签： ios objective-c json nsmutabledictionary nsjsonserialization

【解决方案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;
}

【讨论】：

【解决方案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: ]

【讨论】：