swift - UIPickerView 滚动行消失

Question

我已经搜索过，但我还没有找到解决方案，我有一个 UIPickerView，当我开始查看时工作正常，当我滚动行时消失

class SemanaViewController: UIViewController, UITableViewDelegate, UITableViewDataSource, UIPickerViewDataSource, UIPickerViewDelegate {

    let letters = ["A","B","C","D","F","G","H"]

    @IBOutlet weak var pickerView: UIPickerView!

    override func viewDidLoad() {
        super.viewDidLoad()
        self.tableView.delegate = self
        self.tableView.dataSource = self
        self.pickerView.dataSource = self
        self.pickerView.delegate = self
        ....
    }
....
    func numberOfComponents(in pickerView: UIPickerView) -> Int {
        return 1
    }

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


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

    func pickerView(_ pickerView: UIPickerView, viewForRow row: Int, forComponent component: Int, reusing view: UIView?) -> UIView {

        let pickerLabel = UILabel()
        //pickerLabel.textColor = UIColor.red
        pickerLabel.text = letters[row]

        return pickerLabel
    }

打印

有什么建议吗？谢谢

Answer 1

根据我创建 View 的方式，我发现错误正在发生。

我有一个 UISegmentedControl 和 2 个 subview (UIViewController)，错误发生在 1 个 subview (SemanalmenteViewController)，我已经更改了此作品的 subview 创建方式。

我不知道，但我认为这与父 View Controller 有关。