使用GKRandomSource生成随机数

Question

我在结构中使用GKRandomSource在视图中返回一个随机励志名言。有没有办法返回这个随机数并省略之前的输入？这样用户不会连续两次收到相同的报价。

let inspiration = [ 
    "You are looking rather nice today, as always.", 
    "Hello gorgeous!", 
    "You rock, don't ever change!", 
    "Your hair is looking on fleek today!", 
    "That smile.", 
    "Somebody woke up on the right side of bed!"] 

func getRandomInspiration() -> String { 
    let randomNumber = GKRandomSource.sharedRandom().nextIntWithUpperBound(inspiration.count) 
    return inspiration[randomNumber] 
} 

Answer 1

要产生相同的报价保持，跟踪最后一个在struct属性调用lastQuote。然后将最大随机数减1，如果生成的结果与lastQuote相同，则改为使用max。

struct RandomQuote { 
    let inspiration = [ 
     "You are looking rather nice today, as always.", 
     "Hello gorgeous!", 
     "You rock, don't ever change!", 
     "Your hair is looking on fleek today!", 
     "That smile.", 
     "Somebody woke up on the right side of bed!"] 

    var lastQuote = 0 

    mutating func getRandomInspiration() -> String { 
     let max = inspiration.count - 1 
     // Swift 3 
     // var randomNumber = GKRandomSource.sharedRandom().nextInt(upperBound: max) 
     var randomNumber = GKRandomSource.sharedRandom().nextIntWithUpperBound(max) 
     if randomNumber == lastQuote { 
      randomNumber = max 
     } 
     lastQuote = randomNumber 
     return inspiration[randomNumber] 
    } 
} 

var rq = RandomQuote() 
for _ in 1...10 { 
    print(rq.getRandomInspiration()) 
}