如何快速在 NSUserDefault 中设置字典? [英] How to set Dictionary in NSUserDefault in swift?

问题描述

我有一个可变字典(以 [Int:Int] 的形式)并希望它能够保存它.我会像这样使用 NSUserDefaults:

I've a mutable dictionary (in form of [Int:Int]) and want that to save it. I would use NSUserDefaults like that:

    var myDic: NSMutableDictionary = [:]
        myDic = [1:2]
        NSUserDefaults.standardUserDefaults().setObject(myDic, forKey: "myDic")

但是我得到一个错误:

线程 1:信号 SIGABRT

Thread 1: signal SIGABRT

我不知道为什么.

推荐答案

setObject(_:forKey:) can't accept Dictionary with a key which is integer type.该方法需要属性列表对象，但 myDic = [1:2] 不是属性列表对象.

setObject(_:forKey:) can’t accept Dictionary with a key which is integer type. The method requires property-list objects, but myDic = [1:2] is not property-list object.

关于它的文件有两个.

NSUserDefaults 的 setObject(_:forKey:)

value 参数只能是属性列表对象:NSData，NSString、NSNumber、NSDate、NSArray 或 NSDictionary.为了NSArray 和 NSDictionary 对象，它们的内容必须是属性列出对象.

The value parameter can be only property list objects: NSData, NSString, NSNumber, NSDate, NSArray, or NSDictionary. For NSArray and NSDictionary objects, their contents must be property list objects.

关于属性列表

虽然 NSDictionary 和 CFDictionary 对象允许它们的键是任何类型的对象，如果键不是字符串对象，则集合不是属性列表对象.

And although NSDictionary and CFDictionary objects allow their keys to be objects of any type, if the keys are not string objects, the collections are not property-list objects.

如果将整数键设置为Dictionary，则Dictionary 对象不能用于setObject 的值.您必须像这样使用字符串作为键:

If you set a integer-key to Dictionary, the Dictionary object cannot be used for a value of setObject. You have to use a string for the key like this:

myDic = ["1": 2]

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