Swift -无法使PickerView库工作

Question

我正在尝试将这个库集成到我的项目中。

https://github.com/filipealva/PickerView

按照指示，我在接口构建器中添加了一个UIView，并创建了到视图的@IBOutlet连接。

这是我的控制器的代码

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IBOutlet连接是在控制器中创建的，但是选择器没有显示在视图中，这里发生了什么错误？

下面是故事板视图的截图。

​

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Answer 1

您正在获得红色背景颜色，这意味着正在显示选择视图(在configureDayPicker方法中设置红色背景)。我认为您没有得到文本，因为您使用的是index而不是row来访问数组中的值。试着改变

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：，尝试将文本颜色设置为对比，以确认数据是否正在加载(色调颜色可能是将文本混合到背景中)。