在一个视图中设置两个 UIPickerviews

Question

我在初学者 Swift 项目的一个视图中设置两个 UIPickerview 时遇到问题，我不断收到 Cannot subscript a value of type '[Range<Int>]' 错误，我无法理解我的想法做错了我正在研究这个项目以学习 swift.

@IBOutlet weak var hourWorkedPicker: UIPickerView!
@IBOutlet weak var payRatePicker: UIPickerView!
@IBOutlet weak var total: UILabel!


let hoursWorked = [10...60]
let payRate = [9...50]

override func viewDidLoad() {
    super.viewDidLoad()
}

func numberOfComponentsInPickerView(pickerView: UIPickerView) -> Int {
    return 1
}

func pickerView(pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
    if pickerView == hourWorkedPicker {
        return hoursWorked.count
    } else { // if it's the second picker view
        return payRate.count
    }
}

func pickerView(pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
    if pickerView == hourWorkedPicker {
        return hoursWorked[row] //ERORR IS HERE <-----------------------------
    } else {
        return payRate[row] //ERORR IS HERE <--------------------------------
    }
}

Answer 1

您的函数需要 return 值为字符串。因为您没有将它们定义为字符串数组。

尝试使用

let hoursWorked = ["10", "20", "30", "40"];
let payRate = ["9", "10", "11"]

如果这看起来很费力，请以编程方式构建此数组。

Answer 2

let hoursWorked = [10...60]
let payRate = [9...50]

这些是范围变量而不是数组。您只能对数组使用下标。因此它失败于

return hoursWorked[row]

因此，您应该将范围转换为数组。

要转换，你可以使用类似下面的东西

let hoursWorked: [Int] = Array(10...60)
or
let hoursWorked = [Int](10...60)

在一个视图中设置两个 UIPickerviews

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