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标题: ios - 尝试在 userDefaults 中存储 Int、arrayof [string] 对时出错 [打印本页]

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作者: 菜鸟教程小白    时间: 2022-12-13 01:40
标题: ios - 尝试在 userDefaults 中存储 Int、arrayof [string] 对时出错

self.fetchMin(forStartDate: start, toEndDate: end) { (min, chal) in

    guard let mins = min, let challenges = chal else {
        return
    }

    let dict: [Int : [String]]  = [mins:challenges]

    UserDefaults.standard.set(dict, forKey: "WeekStates")

}

嗨，在上面的程序中，我试图在 userDefaults 中存储键和数组对字符串，但如果我这样做，它会意外崩溃。

如果我尝试使用一个值，它会起作用。

例如:

`let dict: [String]  =  challenges
 UserDefaults.standard.set(dict, forKey: "WeekStates")

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Best Answer-推荐答案

https://developer.apple.com/documentation/foundation/userdefaults

The UserDefaults class provides convenience methods for accessing common types such as floats, doubles, integers, Booleans, and URLs. A default object must be a property list—that is, an instance of (or for collections, a combination of instances of): NSData , NSString , NSNumber , NSDate , NSArray , or NSDictionary . If you want to store any other type of object, you should typically archive it to create an instance of NSData. For more details, see Preferences and Settings Programming Guide.

你可以这样做。

let dict: [Int : [String]]  = [1:["iOS Dev"]]

    UserDefaults.standard.set(NSKeyedArchiver.archivedData(withRootObject: dict as NSDictionary) as NSData, forKey: "4WeekStates")

    if let unarchivedObject = UserDefaults.standard.object(forKey: "4WeekStates") as? Data {

        let dic = NSKeyedUnarchiver.unarchiveObject(with: unarchivedObject as Data) as? NSDictionary
        print(dic!)
    }

关于ios - 尝试在 userDefaults 中存储 Int、arrayof [string] 对时出错，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/44581113/

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