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标题: iphone - NSUserDefaults 无法保存 NSMutableDictionary [打印本页]

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作者: 菜鸟教程小白    时间: 2022-12-13 00:25
标题: iphone - NSUserDefaults 无法保存 NSMutableDictionary

我正在尝试使用此代码将 NSMutableDictionary 保存到 NSUserDefaults:

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];

但是我收到了这个消息:

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

而且 Person 类也有 NSCoding:

人.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

人.m

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

#pragma mark
#pragma mark NSCoder

- (void)encodeWithCoderNSCoder *)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)initWithCoderNSCoder *)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？

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Best Answer-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。在存储到 NSUserDefaults 之前，使用您的 NSCoder 方法序列化为 NSData(使用 NSKeyedArchiver)。

另外，看看 this

关于iphone - NSUserDefaults 无法保存 NSMutableDictionary，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/14282892/

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