swift - 将 UInt32 值保存到 NSUserDefaults (Swift 2.0) 错误

Question

我对 Swift 2.0 很陌生，而且很困在这里......我根据用户设置的下限和上限范围创建了一个随机数生成器。当我可以将 low 和 high 的变量设置为 Uint32 时，此函数非常适合我的测试函数有一次我尝试将 NSUserDefaults 中的低/高范围存储为整数。现在，当我尝试加载用户设置的低值和高值以在下面的函数中使用时，它会给出错误，它需要是 UInt32 值。

问题是......我似乎无法弄清楚如何将它们保存在 NSUser 中作为该类型。或者将其解开为来自 UserDefaults 的类型。

我的具体错误消息是...错误 IS 二元运算符 + 不能应用于 UInt32 和 In 类型的操作数

非常感谢您的帮助和时间，我真的很感激!你们在这里太棒了!

如果您还需要我提供任何其他信息，请告诉我:)

 //CREATE SAVE SETTINGS FOR LOW AND HIGH RANGE
 NSUserDefaults.standardUserDefaults().integerForKey("CatLowRange")                       
 NSUserDefaults.standardUserDefaults().integerForKey("CatHighRange")

//Variables to load in values from NSUserDefaults on load
var catLowRange             = 0     //Load In Low Range From NSUser
var catHighRange            = 40    //Load In High Range From NSUser

//LOAD IN VALUES TO VARIABLES FROM NSUSERDEFAULTS

catLowRange = NSUserDefaults.standardUserDefaults().integerForKey("CatLowRange")

catHighRange = NSUserDefaults.standardUserDefaults().integerForKey("CatHighRange")

**//My Function To Generate RandNumber...** 
*ERROR IS Binary Operator + cannot be applied to operands of type UInt32 and Int*
randomNumber = arc4random_uniform (catHighRange - catLowRange) + catLowRange

Answer 1

对于任何想知道的人...感谢 Adam，我们有了答案...这是代码，详细说明了我如何使用他的建议来使这件事发挥作用:)

//WORKING METHOD!?
    //vars for use
    let catLowRange         : UInt32    = 0
    let catHighRange        : UInt32    = 40

    var randNumGenerated    : UInt32    = 0

    //SAVEPOINTS (STEP 1 - save the UInt32s as int for saving)
    NSUserDefaults.standardUserDefaults().setInteger(Int(catLowRange), forKey: "CatLowRange")
    NSUserDefaults.standardUserDefaults().setInteger(Int(catHighRange), forKey: "CatHighRange")

    //LOAD (STEP 2 - Take Int save as a UInt32 now)
    let catLowRangeLoad = UInt32(NSUserDefaults.standardUserDefaults().integerForKey("CatLowRange"))
    let catHighRangeLoad = UInt32(NSUserDefaults.standardUserDefaults().integerForKey("CatHighRange"))

    //FUNCTION TEST
    randNumGenerated = arc4random_uniform (catHighRangeLoad - catLowRangeLoad) + catLowRangeLoad

    //CHECK
    print ("catLowRange = \(catLowRange)")
    print ("catLowRangeLoad = \(catLowRangeLoad)")
    print ("catHighRange = \(catHighRange)")
    print ("catHighRangeLoad = \(catHighRangeLoad)")
    print ("randNumGen = \(randNumGenerated)")