Question

我在iOS中使用Swift 3制作了一些财富之轮。我使用了带有UIPickerView的库，我自定义了视图，我使行无穷无尽（因此用户有了滚动浏览的想法）无尽的物品）。

唯一的问题是，用户可以通过命运之轮的价格缓慢滑动，所以基本上他可以选择他想要的任何价格。

我虽然要防止这种情况，但无论何时用户点击或滑动滚轮，我都会使UIPickerView旋转并使用随机数来决定命运之轮的结果。

我知道如何在方向盘上添加手势识别器，但我唯一不知道的是如何以编程方式启动UIPickerView旋转。

提前致谢！

Answer 1

我认为你正在寻找这个：

pick.selectRow(10, inComponent: 0, animated: true)

但如果你想看一个完整的例子，我就是为你做的。

class ViewController: UIViewController, UIPickerViewDataSource{

@IBOutlet var pick: UIPickerView!

var myArr = [Int]()

var myT = Timer()

override func viewDidLoad() {
    super.viewDidLoad()

    for element in 0...100 {

        myArr.append(element)
        }


    myT = Timer.scheduledTimer(timeInterval: 3, target: self, selector: #selector(ViewController.movePicker), userInfo: nil, repeats: true)



}



 //MARK: - move picker

func movePicker()  {


    let position = Int(arc4random_uniform(89) + 10)


    pick.selectRow(position, inComponent: 0, animated: true)
    pick.showsSelectionIndicator = true

    if position == 50 || position == 72 || position == 90 || position == 35  {

        myT.invalidate()

        let alert = UIAlertController(title: "You Won!!", message: "Congratulations!!!", preferredStyle: .alert)
        let buttonOK = UIAlertAction(title: "OK", style: UIAlertActionStyle.default, handler: nil)
        let playAgain = UIAlertAction(title: "Play Again!", style: .default, handler: { (action) in

            self.myT = Timer.scheduledTimer(timeInterval: 3, target: self, selector: #selector(ViewController.movePicker), userInfo: nil, repeats: true)
        })

        alert.addAction(buttonOK)
        alert.addAction(playAgain)

        present(alert, animated: true, completion: nil)



    }

}




 //MARK: - picker
func numberOfComponents(in pickerView: UIPickerView) -> Int {

    return 1

}

func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
    return myArr.count
}

func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
    return "\( myArr[row])"
}


}

我希望我帮助过你

Swift 3 UIPickerView以编程方式开始旋转

1 个答案: