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标题: ios - 将 NSDictionary(带有自定义类)保存到 NSUserDefaults [打印本页]

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作者: 菜鸟教程小白    时间: 2022-12-12 16:23
标题: ios - 将 NSDictionary(带有自定义类)保存到 NSUserDefaults

这个问题在这里已经有了答案:

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Best Answer-推荐答案

您的代码似乎不错。我找不到错误所以尝试换行:

self.myDictionary = [NSKeyedUnarchiver unarchiveObjectWithData:data];

到

id unknownObject = [NSKeyedUnarchiver unarchiveObjectWithData:data];
NSLog(@"%@",[unknownObject class]);

看看@控制台。如果输出是字典，也许你也应该尝试强制转换。所以尝试将其更改为:

self.myDictionary = (NSDictionary*)[NSKeyedUnarchiver unarchiveObjectWithData:data];

编辑

NSDictionary *dictionary = [NSDictionary dictionaryWithObjectsAndKeys"object1",@"key1",@"object2",@"key2",@"object3",@"key3", nil];
NSLog(@"before: %@",dictionary);
NSData *myData = [NSKeyedArchiver archivedDataWithRootObject:dictionary];
NSDictionary *myDictionary = (NSDictionary*) [NSKeyedUnarchiver unarchiveObjectWithData:myData];
NSLog(@"after: %@",myDictionary);

输出:

2013-11-13 14:32:31.369 DemoM[175:60b] before: {
    key1 = object1;
    key2 = object2;
    key3 = object3;
}
2013-11-13 14:32:31.372 DemoM[175:60b] after: {
    key1 = object1;
    key2 = object2;
    key3 = object3;
}

关于ios - 将 NSDictionary(带有自定义类)保存到 NSUserDefaults，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/19954845/

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