Swift-无法使PickerView库正常工作

Question

我正在尝试将此库集成到我的项目中

https://github.com/filipealva/PickerView

按照指示，我在界面构建器中添加了UIView并创建了与视图的@IBOutlet连接。

这是我控制器的代码

import UIKit
import PickerView

class SignUpStep1ViewController: UIViewController {

    @IBOutlet weak var nextBtn: UIButton?
    @IBOutlet weak var dayPicker: PickerView!

    var months = [
        "January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December"
    ]

    override func viewDidLoad() {
        super.viewDidLoad()
        dayPicker.delegate = self
        dayPicker.dataSource = self
        configureDayPicker()
        title = "BIRTH DATE"
    }

    override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)
        self.nextBtn?.layer.cornerRadius = 22.5
    }

    @IBAction func nextBtnClicked(sender: UIButton) {
        performSegue(withIdentifier: "SignUpStep2ViewController", sender: self)
    }

    fileprivate func configureDayPicker() {
        print("DayPicker Configuration")
        dayPicker.scrollingStyle = .default
        dayPicker.backgroundColor = UIColor.red
        dayPicker.translatesAutoresizingMaskIntoConstraints = false
        dayPicker.scrollingStyle = PickerView.ScrollingStyle(rawValue: 1)!
    }

    override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
        let backItem = UIBarButtonItem()
        backItem.title = ""
        navigationItem.backBarButtonItem = backItem
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
    }
}

extension SignUpStep1ViewController: PickerViewDataSource {

    func pickerViewNumberOfRows(_ pickerView: PickerView) -> Int {
        return months.count
    }

    func pickerView(_ pickerView: PickerView, titleForRow row: Int, index: Int) -> String {
        return months[index]
    }
}

extension SignUpStep1ViewController: PickerViewDelegate {

    func pickerViewHeightForRows(_ pickerView: PickerView) -> CGFloat {
        return 50.0
    }

    func pickerView(_ pickerView: PickerView, didSelectRow row: Int) {

    }

    func pickerView(_ pickerView: PickerView, didTapRow row: Int, index: Int) {

    }

    func pickerView(_ pickerView: PickerView, styleForLabel label: UILabel, highlighted: Bool) {
        if highlighted {
            label.font = UIFont.systemFont(ofSize: 25.0)
            label.textColor = view.tintColor
        } else {
            label.font = UIFont.systemFont(ofSize: 15.0)
            label.textColor = .lightGray
        }
    }
}

它显示了在控制器中创建了IBOutlet连接，但是选择器未在视图中显示，这是怎么回事？

这是情节提要视图的屏幕截图。

Answer 1

您将获得红色背景色，这表示正在显示pickerview（红色背景已在configureDayPicker方法中设置）。 我认为您没有得到文本，因为您使用index而不是row来访问数组中的值。 尝试改变

func pickerView(_ pickerView: PickerView, titleForRow row: Int, index: Int) -> String {
        return months[index]
}

至

func pickerView(_ pickerView: PickerView, titleForRow row: Int, index: Int) -> String {
        return months[row]
}

编辑：另外，请尝试将文本颜色设置为对比度，以确认是否实际上已加载了数据（色彩可能会将文本混合到背景中）