Question

我有一个如下所示的数组：

var myArray = ["1one", "1two", "1three", "1four", "1five", "1six"]

为了得到随机，我用这个：

var originalNames = [String]()

func getRandomName() -> String {
    if (names.count == 0) {
        names = originalNames
    }
    let randomNumber = Int(arc4random_uniform(UInt32(names.count)))
    return names.removeAtIndex(randomNumber)
}

我这样使用它：

self.randomLabel.text = getRandomName()

如您所见，该数组包含六个不同的字符串。我目前使用的代码将返回随机添加数组内的字符串，但我只想随机返回前3个字符串。我怎么能这样做？

Answer 1

您可以尝试使用

var originalNames = [String]()

func getRandomName() -> String {
    if (names.count == 0) {
        names = originalNames
    }
    let randomNumber = Int(arc4random_uniform(3))
    return names[randomNumber]
}

所以let randomNumber = Int(arc4random_uniform(3))这会将随机Int值返回到3。

Answer 2

var myArray = ["1one", "1two", "1three", "1four", "1five", "1six"]
var result:[String] = []
while result.count < 3 {
    let randomNumber = Int(arc4random_uniform(UInt32(myArray.count)))
    result.append(myArray.removeAtIndex(randomNumber))
}
print(result)   // "["1two", "1one", "1three"]\n"

如果您不想修改原始数组，只需复制一份

let myArray = ["1one", "1two", "1three", "1four", "1five", "1six"]
var inputNames = myArray
var result:[String] = []
while result.count < 3 {
    result.append(inputNames.removeAtIndex(Int(arc4random_uniform(UInt32(inputNames.count)))))
}
print(result)   // "["1six", "1two", "1one"]\n"

返回数组中的前3个值

2 个答案: