NSUserDefaults 无法保存 NSMutableDictionary [英] NSUserDefaults fail to save NSMutableDictionary

问题描述

我正在尝试使用以下代码将 NSMutableDictionary 保存到 NSUserDefaults:

Iam trying to save NSMutableDictionary to NSUserDefaults with this code:

NSUserDefaults *def = [NSUserDefaults standardUserDefaults];
NSMutableDictionary *repositoryData = [[NSMutableDictionary alloc] init];

[repositoryData setObject:personData forKey:@"persondata"];

[def setObject:repositoryData forKey:@"kUserRepository"];
[def synchronize];
[repositoryData removeAllObjects];
[repositoryData release];

但我收到了这条消息:

    [NSUserDefaults setObject:forKey:]: Attempt to insert non-property value '{
    persondata = "<Person: 0x1ed57e70>";
}' of class '__NSDictionaryM'.  Note that dictionaries and arrays in property lists must also contain only property values.

并且 Person 类也有 NSCoding:

and also the Person Class have NSCoding:

Person.h

    @interface Person : NSObject <NSCoding> {
    NSString *name;
    NSString *email;
    NSString *phoneNumber;
    NSString *gender;

    int age;
}

@property (nonatomic, retain) NSString *name;
@property (nonatomic, retain) NSString *email;
@property (nonatomic, retain) NSString *phoneNumber;
@property (nonatomic, retain) NSString *gender;
@property (assign) int age;


@end

Person.m

    @implementation Person
@synthesize name,email,phoneNumber,age,gender;

#pragma mark
#pragma mark NSCoder

- (void)encodeWithCoder:(NSCoder *)encoder{
    [encoder encodeObject:self.name forKey:@"username"];
    [encoder encodeObject:self.email forKey:@"useremail"];
    [encoder encodeObject:self.phoneNumber forKey:@"userphonenumber"];
    [encoder encodeObject:self.gender forKey:@"usergender"];

    [encoder encodeInt:self.age forKey:@"userage"];
}

- (id)initWithCoder:(NSCoder *)decoder {
    if(self = [super init]){

        self.name = [decoder decodeObjectForKey:@"username"];
        self.email = [decoder decodeObjectForKey:@"useremail"];
        self.phoneNumber = [decoder decodeObjectForKey:@"userphonenumber"];
        self.gender = [decoder decodeObjectForKey:@"usergender"];

        self.age = [decoder decodeIntForKey:@"userage"];
    }
    return self;
}

@end

知道为什么会这样吗?

推荐答案

对于什么类型的数据可以同步到 NSDictionary 中的 NSUserDefaults 有非常具体的限制.这些包括 NSString、NSNumber、NSData、NSArray 和 NSDictionary.在存储在 NSUserDefaults 之前，使用您的 NSCoder 方法序列化为 NSData(使用 NSKeyedArchiver).

There are very specific restrictions as to what type of data can be synced to NSUserDefaults within an NSDictionary. These include NSString, NSNumber, NSData, NSArray and NSDictionary. Use your NSCoder methods to serialize to NSData (using NSKeyedArchiver) before storing in the NSUserDefaults.

另外，看看这个

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