ios - 从另一个 pickerView 选择项目时隐藏 pickerView 的行

Question

我创建了一个使用数组作为数据源的 UIPickerView，我想在第三个组件上选择一个项目后隐藏第四个组件上的一些项目。我该怎么做？

class ViewControllerEspessuras: UIViewController, UIPickerViewDelegate, UIPickerViewDataSource {

    var data = [["1.50","1.60","1.67","1.74"],
                ["-10.00 Esf.","-9.00 Esf.","-8.00 Esf.","-7.00 Esf.","-6.00 Esf.","-5.00 Esf.","-4.00 Esf.","-3.00 Esf.","-2.00 Esf.","-1.00 Esf.","Plano","+1.00 Esf.","+2.00 Esf.","+3.00 Esf.","+4.00 Esf.","+5.00 Esf.","+6.00 Esf.","+7.00 Esf.","+8.00 Esf.","+9.00 Esf.","+10.00 Esf."],
                ["1.50","1.60","1.67","1.74"],
                ["-10.00 Esf.","-9.00 Esf.","-8.00 Esf.","-7.00 Esf.","-6.00 Esf.","-5.00 Esf.","-4.00 Esf.","-3.00 Esf.","-2.00 Esf.","-1.00 Esf.","Plano","+1.00 Esf.","+2.00 Esf.","+3.00 Esf.","+4.00 Esf.","+5.00 Esf.","+6.00 Esf.","+7.00 Esf.","+8.00 Esf.","+9.00 Esf.","+10.00 Esf."]]

    func numberOfComponentsInPickerView(pickerView: UIPickerView) -> Int {
        return 4
    }
    func pickerView(pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
        return data[component].count
    }

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

    func pickerView(pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
        let picker1 = data[0][pickerView.selectedRowInComponent(0)]
        let picker2 = data[1][pickerView.selectedRowInComponent(1)]
        let picker3 = data[2][pickerView.selectedRowInComponent(2)]
        let picker4 = data[3][pickerView.selectedRowInComponent(3)]
    }
}

Answer 1

您应该更改 numberOfRowsInComponent 和 titleForRow forComponent 以便它们考虑第三行的选择。

之后，当第三个组件发生变化时，您可以简单地在最后一个组件上调用 reloadComponent。

您可以在以下 SO 问题之一中获得更多信息:

• disabling the values in one component of picker based on value selected in other component
• How to change the picker rows based on another picker's selection?