當對象具有內部對象時如何將對象轉換為JSON

Question

我有自定義類對象，其中包含用戶對象：

@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函數中，我沒有映射User對象。
在這種情況下將對象轉換為nsdictionary的好方法是什么？

Answer 1

修改您的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;
}

Answer 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;
}

在設置字典以嘗試使用鍵時

[dictionary   setObject: forKey: ]