Question

在我的应用中，我试图在事件->重复->自定义屏幕上为两个PickerViews重新创建与本机iOS日历应用中相同的行为逻辑。

我发现，我可以更改整个2d Picker，具体取决于1st Picker的值。只需在2d Picker的单元格中制作几个Picker，并在其2d组件中使用不同的文本，然后根据第一个Picker的isHidden = true将它们设为false或selectedRow。因此，如果用户在第一个选择器中选择了“每日”，我将在第一个部分中显示2d Picker，在第一个部分中显示天数，在第二个部分中显示文本“ days”，在其他第二个选择器中显示（第二个部分中包含“ weeks”和“ moths”）-隐。对我来说看起来不太简洁，但可以使用，因为当用户与第一个Picker交互时，第二个Picker不可见。

但是我不知道如何在2d Picker中使2d组件的文本依赖于同一选择器中1st组件的值。正如我们在日历中看到的那样，当用户在第一个组件中选择“ 1”时，在第二个中他看到“天”，但是当他选择的数字大于1时，他在第二个组件中看到“天”。加载视图后，无法找到如何更改选择器的标题。

我如何使其起作用？非常期待阅读您的宝贵建议。

Screenshot of this Event -> Repeat -> Custom screen in Calendar app

UPD：

问题已通过.reloadComponent(Int)解决。

因此，我有一些代码，希望对您有所帮助。：）它还包含用于更新两个Picker单元格右侧的标题以及更新页脚中文本的逻辑，所有这些都与Calendar中的相同。

class CustomRepeatTableViewController: UITableViewController, UIPickerViewDataSource, UIPickerViewDelegate {

@IBOutlet weak var frequencyPicker: UIPickerView!
@IBOutlet weak var frequencyLabel: UILabel!

@IBOutlet weak var frequensyNumberPicker: UIPickerView!
@IBOutlet weak var frequencyNumberLabel: UILabel!

    let frequencyPickerData = [
        ["Minutely", "Hourly","Daily","Weekly"]
    ]

    var frequencyNumberPickerData = [
        ["1", "2", "3", "4", "5"]
    ]

    let units = ["minute", "hour", "day", "week"]

    func updatePicker(_ pickerView: UIPickerView, _ component: Int, _ row: Int) {
        let unit = units[frequencyPicker.selectedRow(inComponent: 0)]
        if pickerView == frequencyPicker {
            frequencyNumberPickerData.remove(at: 1)
            if frequensyNumberPicker.selectedRow(inComponent: 0) == 0 {
                frequencyNumberPickerData.append([unit])
            } else {
                frequencyNumberPickerData.append([unit + "s"])
            }
            frequensyNumberPicker.reloadComponent(1)
        } else {
            if component == 0 && row == 0 {
                frequencyNumberPickerData.remove(at: 1)
                frequencyNumberPickerData.append([unit])
                frequensyNumberPicker.reloadComponent(1)
            } else {
                frequencyNumberPickerData.remove(at: 1)
                frequencyNumberPickerData.append([unit + "s"])
                frequensyNumberPicker.reloadComponent(1)
            }
        }
    }

    func updateLabels() {
        let selectedRow = frequencyPicker.selectedRow(inComponent: 0)
        let unit = units[selectedRow]
        let frequencyNumber = frequencyNumberPickerData[0][frequensyNumberPicker.selectedRow(inComponent: 0)]
        var text: String
        var footerText: String

        let frequency = frequencyPickerData[0][selectedRow]
        frequencyLabel.text = frequency

        if frequensyNumberPicker.selectedRow(inComponent: 0) > 0 {
            text = frequencyNumber + " " + unit + "s"
            footerText = frequencyNumber + " " + unit + "s."
        } else {
            text = unit.capitalized
            footerText = unit + "."
        }

        frequencyNumberLabel.text = text

        tableView.tableFooterView = UIView(frame: CGRect(x: 0, y: 0, width: 230, height: 30))
        let label = UILabel(frame: CGRect(x:20, y:0, width:230, height:30))
        label.text = "Repeat will occur every " + footerText
        label.font = label.font.withSize(13)
        label.textColor = UIColor.darkGray
        tableView.tableFooterView?.addSubview(label)
    }

    func numberOfComponents(in pickerView: UIPickerView) -> Int {
        if pickerView == frequencyPicker {
            return frequencyPickerData.count
        } else {
            return frequencyNumberPickerData.count
        }
    }

    func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
        if pickerView == frequencyPicker {
            return frequencyPickerData[component].count
        } else {
            return frequencyNumberPickerData[component].count
        }
    }

    func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
        if pickerView == frequencyPicker {
            return frequencyPickerData[component][row]
        } else {
            return String(frequencyNumberPickerData[component][row])
        }
    }

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

    override func viewDidLoad() {
        super.viewDidLoad()

        frequencyPicker.delegate = self
        frequencyPicker.dataSource = self
        frequencyPicker.selectRow(1, inComponent: 0, animated: true) //to make selection separators appear

        frequensyNumberPicker.delegate = self
        frequensyNumberPicker.dataSource = self
        frequensyNumberPicker.selectRow(0, inComponent: 0, animated: true) //to make selection separators appear

        updateLabels()

        frequencyNumberPickerData.append([units[frequencyPicker.selectedRow(inComponent: 0)]])
    }
}

如何根据其他组件的值更改Picker组件之一的标题（例如，在“日历，事件->重复->自定义”屏幕中）

0 个答案: