视图控制器
class ViewController : UIViewController {
// MARK: - Properties -
var tableView : UITableView?
var currentTextfield : UITextField?
var gendersArray : Array<String> = ["Male", "Female"]
var pickerView : UIPickerView?
// MARK: - Lifecycle -
override func viewDidLoad() {
super.viewDidLoad()
// get the size of the iOS device
let screenRect : CGRect = UIScreen.main.bounds
let screenWidth : CGFloat = screenRect.size.width
let screenHeight : CGFloat = screenRect.size.height
// add the picker view
var pickerViewFrame = CGRect(x: 0.0,
y: screenHeight - 162.0,
width: screenWidth,
height: 162.0)
// set pickerview frame for macOS Catalyst
#if targetEnvironment(macCatalyst)
pickerViewFrame = CGRect(x: 0, y: 0, width: 269, height: 240)
#endif
pickerView = UIPickerView.init(frame: pickerViewFrame)
pickerView?.delegate = self
pickerView?.dataSource = self
// ... set tableview
}
}
UIAlertController 函数
// MARK: - UIAlertController -
@objc func textfieldInputAction(pickerView: UIPickerView, textfield: UITextField?) {
print("textfieldInputAction")
// alertController
let alertController = UIAlertController(title: "Title of Action Sheet", message: "", preferredStyle: UIAlertController.Style.actionSheet)
// reload components
pickerView.reloadAllComponents()
// add the picker to the alert controller
alertController.view.addSubview(pickerView)
// set height of Action sheet
let height : NSLayoutConstraint = NSLayoutConstraint(item: alertController.view!, attribute: NSLayoutConstraint.Attribute.height, relatedBy: NSLayoutConstraint.Relation.equal, toItem: nil, attribute: NSLayoutConstraint.Attribute.notAnAttribute, multiplier: 1, constant: 350)
alertController.view.addConstraint(height)
// okAction
let okAction = UIAlertAction(title: "Done", style: .default, handler: {
(alert: UIAlertAction!) -> Void in
// end editing
DispatchQueue.main.async {
textfield?.resignFirstResponder()
DispatchQueue.main.async {
UIApplication.shared.sendAction(#selector(UIResponder.resignFirstResponder), to: nil, from: nil, for: nil)
}
}
})
alertController.addAction(okAction)
// popoverController
if let popoverController = alertController.popoverPresentationController {
popoverController.sourceView = textfield //to set the source of your alert
popoverController.sourceRect = textfield?.bounds ?? CGRect(x: 0, y: 0, width: 0, height: 0 )
popoverController.permittedArrowDirections = [.down, .up]
}
// present alertController
self.present(alertController, animated: true, completion: nil)
}
表格视图
// MARK: - Tableview -
extension ViewController : UITableViewDelegate, UITableViewDataSource {
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell : TextFieldCell = tableView.dequeueReusableCell(withIdentifier: "TextFieldCell", for: indexPath) as! TextFieldCell
// textfield
cell.textField?.delegate = self
cell.textField?.inputView = pickerView
return cell
}
}
UITextField 委托
// MARK: - UITextField -
extension ViewController : UITextFieldDelegate {
func textFieldShouldBeginEditing(_ textField: UITextField) -> Bool {
print("textFieldShouldBeginEditing")
#if targetEnvironment(macCatalyst)
if textField.inputView == self.pickerView {
self.currentTextfield = textField
self.textfieldInputAction(pickerView: self.pickerView!, textfield: self.currentTextfield!)
return false
}
#endif
return true
}
}
UIPickerView 委托
// MARK: - PickerView Delegates -
extension ViewController : UIPickerViewDelegate, UIPickerViewDataSource {
// components
func numberOfComponents(in pickerView: UIPickerView) -> Int {
return 1
}
// rows
func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
print("numberOfRowsInComponent")
return gendersArray.count
}
// title
func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
return gendersArray[row]
}
// select row
func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
print("pickerView: didSelectRow: \(row)")
currentTextfield?.text = gendersArray[row]
self.tableView?.reloadData()
}
}