UIPickerView取决于第一组件不更新UI

问题描述 投票:1回答:1

我想建立与嵌套数据和2个组成一个UIPicker。 (选择水果当例如 - >显示香蕉,苹果...;当选择蔬菜 - >显示的西红柿...)的第二组分应该是依赖于第一组件的选择。

这工作,但第二个部件的UI不是直接更新。我必须挖掘第二个部件上看到标题。我尝试更新的选择后的组件(picker.reloadComponent(1))也AllComponents picker.reloadAllComponents()

有任何想法吗?

class ViewController: UIViewController, UIPickerViewDataSource, UIPickerViewDelegate {

    @IBOutlet weak var picker: UIPickerView!

    var plants = [Dictionary<String, Any>]()
    var groups:[String] = [String]()

    override func viewDidLoad() {
        super.viewDidLoad()

        plants.append([
            "name": "Fruits",
            "groups": [
                "Banana",
                "Apple"
            ]
        ])
        plants.append([
            "name": "Veggies",
            "groups": [
                "Tomatoe",
                "Salad",
                "Cucumber"
            ]
        ])

        if plants[0]["groups"] != nil {
            groups = plants[0]["groups"] as! Array
        }

        picker.delegate = self
        picker.dataSource = self
    }

    func numberOfComponents(in pickerView: UIPickerView) -> Int {
        return 2
    }

    func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
        if component == 0 {
            return plants.count
        } else if component == 1 {
            return groups.count
        }

        return 0
    }

    func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
        if component == 0 {
            // Update groups array, based on selection
            if plants[row]["groups"] != nil {
                groups = plants[row]["groups"] as! Array
            }

            picker.reloadComponent(1) //also tried picker.reloadAllComponents() here
        }
    }

    func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
        if component == 0 {
            if plants[row]["name"] != nil {
                return plants[row]["name"] as! String
            }
        } else if component == 1 {
            // return values of current group
            return groups[row]
        }

        return ""
    }
}

提前致谢!

ios swift uipickerview
1个回答
1
投票

迅速4.2 / 10的Xcode

你的代码工作正常。如果你的问题是,你希望第二个组件重新加载到它的第一个项目,试试这个picker.reloadComponent(1)后:

picker.selectRow(0, inComponent: 1, animated: true)

否则,请具体谈谈这个问题。

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