[英]Swift - Cannot make PickerView Library to Work
我正在嘗試將此庫集成到我的項目中
https://github.com/filipealva/PickerView
按照指示,我在界面構建器中添加了UIView並創建了與視圖的@IBOutlet連接。
這是我控制器的代碼
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
}
}
}
它顯示了在控制器中創建了IBOutlet連接,但是選擇器未在視圖中顯示,這是怎么回事?
這是情節提要視圖的屏幕截圖。
您將獲得紅色背景色,這表示正在顯示pickerview(紅色背景已在configureDayPicker方法中設置)。 我認為您沒有得到文本,因為您使用index
而不是row
來訪問數組中的值。 嘗試改變
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]
}
編輯:另外,請嘗試將文本顏色設置為對比度,以確認是否實際上已加載了數據(色彩可能會將文本混合到背景中)
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