如何在 swift 中为 UIPickerview 添加新元素到 2 组件数组

Question

当我尝试添加带有 .count 的 newItem 时，没有任何显示。当我使用它替换 "car" 时，我在 pickerview 中看不到它，而且在 newItem 出现之前我需要上下滚动几次。

var picker1 = String()
var picker2 = String()

var pickerViewArray = [["Items", "car"], ["Action", "Turn", "Hit", "Pull", "Scrape"]]

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

    return pickerViewArray.count
}

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

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

func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {

    picker1 = pickerViewArray[0] [pickerView.selectedRow(inComponent: 0)] + ""
    picker2 = pickerViewArray[1] [pickerView.selectedRow(inComponent: 1)] + ""
}

func addItemsToArray () {
    stringWall = "Wall"        
    addItemAtIndex = pickerViewArray[0].count
    pickerViewArray[0].insert(newItem, at: addItemAtIndex)
    allRoomArray[arraySelector][wallButton] = stringWall

    pickingRooms()
    print(newItem)
}

Answer 1

我认为人们不会以这种方式做您想做的事。通常，我会创建一个 UITableView 和自定义 UITableViewCell 来实现动态列表。 UIPickerView 是完全预定义的，没有那么多动态视图。

虽然对于您的代码，如果您真的非常需要 UIPickerView 是动态的，我会说

Add self.pickerView.setNeedsLayout() after you change your datasource, pickerViewArray for your case.

我在 XCode9 beta3 上测试过，目标是 iOS 8.0，Swift 3.

如何在 swift 中为 UIPickerview 添加新元素到 2 组件数组

how to add a new element to a 2 component array for UIPickerview in swift

arrays

uipickerview

multidimensional-array

swift