使用GKRandomSource生成隨機數

Question

我在結構中使用GKRandomSource在視圖中返回一個隨機勵志名言。有沒有辦法返回這個隨機數並省略之前的輸入？這樣用戶不會連續兩次收到相同的報價。

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

要產生相同的報價保持，跟蹤最後一個在struct屬性調用lastQuote。然後將最大隨機數減1，如果生成的結果與lastQuote相同，則改爲使用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()) 
}