ios - 使数组中的 3 个随机元素不可见

Question

我在一个数组中有 5 个按钮，我想在按下按钮时随机其中三个按钮不可见。所以最后两个按钮将可见

我尝试过这样的:

 @IBAction func eliminateChoiceClicked(_ sender: Any) {

       let buttons:[UIButton] = [buttonA,buttonB,buttonC,buttonD,buttonE]
       let randomNumber = Int(arc4random_uniform(UInt32(3)))
       buttons[randomNumber].isHidden = !buttons[randomNumber].isHidden

    }

但它需要第一个元素 [0,1,2]，并且每次按下时只有 1 个按钮不可见

Answer 1

您当前仅选择了一个按钮。将其更改为循环以选择 3. 从数组中删除所选按钮并使其不可见。最后，使其余按钮可见:

@IBAction func eliminateChoiceClicked(_ sender: Any) {

   var buttons:[UIButton] = [buttonA,buttonB,buttonC,buttonD,buttonE]

   // Select 3 buttons randomly and hide them
   for _ in 1...3 {
       let randomNumber = Int(arc4random_uniform(UInt32(buttons.count)))
       let button = buttons.remove(at: randomNumber)
       button.isHidden = true
   }

   // Make the remaining buttons visible
   for button in buttons {
       button.isHidden = false
   }

}