我已经为选择器 View 创建了一个 XIB 文件，现在我在点击手势时在 superview 上添加了选择器 View 。它已成功添加，但我无法滚动。我还添加了两个用于取消和完成的按钮，但未检测到这些按钮的任何操作。请告诉我问题是什么
这是添加 uipicker View 的代码。
@objc func didRecognizeTapGesture(_ gesture: UITapGestureRecognizer) {
let frame:CGRect = CGRect(x: 0, y: self.view.frame.height + 200, width: self.view.frame.width, height: 200)
self.itemPicker = ItemPicker.instanceFromNib(with: frame) as? ItemPicker
self.itemPicker?.configureView(frame: frame)
self.view.addSubview(self.itemPicker!)
self.itemPicker?.itemPickerDelegate = self
showView()
}
func showView() {
UIView.animate(withDuration: 0.2) {
self.itemPicker?.frame = CGRect(x: 0, y: self.view.frame.height - 200, width: self.view.frame.width, height: 200)
}
}
func hideView() {
UIView.animate(withDuration: 0.2) {
self.itemPicker?.frame = CGRect(x: 0, y: self.view.frame.height, width: self.view.frame.width, height: 200)
}
}
类选择器 View 的代码
protocol ItemPickerDelegate {
func pickerCancelled()
func pickerDone()
func itemPicked(with item:String)
}
class ItemPicker: UIPickerView {
/// IBOutlets
@IBOutlet weak var pickerView: UIPickerView!
var itemPickerDelegate:ItemPickerDelegate!
var arrItems:[String] = ["Item1","Item2","Item3","Item5","Item6"]
class func instanceFromNib(with frame:CGRect) -> UIView {
let view = Bundle.main.loadNibNamed(Titles.XIB.itemPicker, owner: self, options: nil)! [0] as! UIView
return view
}
func configureView(frame:CGRect) {
self.frame = frame
self.pickerView.delegate = self
self.pickerView.dataSource = self
}
//MARK:IBActions
@IBAction func actionCancel(_ sender: Any) {
DILog.print(items: "actionCancel")
self.itemPickerDelegate.pickerCancelled()
}
@IBAction func actionDone(_ sender: Any) {
DILog.print(items: "actionDone")
self.itemPickerDelegate.pickerDone()
}
}
extension ItemPicker:UIPickerViewDelegate {
func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
}
func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
return arrItems[row]
}
}
extension ItemPicker:UIPickerViewDataSource {
func numberOfComponents(in pickerView: UIPickerView) -> Int {
return 1
}
func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
return arrItems.count
}
}
请帮我解决这个问题。
最佳答案
View Controller 类
import UIKit
class StackViewClass: UIViewController {
/// View in which Picker Subview will be added
var baseView : UIView?
/// Picker View Class object
var customPickerView : ItemPicker?
/// Gesture which is used to show the picker in subview
var tapGesture : UITapGestureRecognizer?
override func viewDidLoad() {
super.viewDidLoad()
/// Assigning Tap gesture
tapGesture = UITapGestureRecognizer()
tapGesture = UITapGestureRecognizer.init(target: self, action: #selector(handleViewTapGesture(_:)))
}
override func viewDidAppear(_ animated: Bool) {
/// Adding Base View in Main View
baseView = UIView()
baseView?.backgroundColor = UIColor.lightGray
baseView?.translatesAutoresizingMaskIntoConstraints = false
self.view.addSubview(baseView!)
baseView?.centerXAnchor.constraint(equalTo: self.view.centerXAnchor).isActive = true
baseView?.centerYAnchor.constraint(equalTo: self.view.centerYAnchor).isActive = true
baseView?.widthAnchor.constraint(equalToConstant: 250).isActive = true
baseView?.heightAnchor.constraint(equalToConstant: 150).isActive = true
/// Adding Gesture
baseView?.addGestureRecognizer(tapGesture!)
}
/// Tap Gesture Handler
@objc func handleViewTapGesture(_ sender: UITapGestureRecognizer) {
customPickerView = ItemPicker()
customPickerView?.frame = CGRect(x: 0, y: sender.view!.frame.maxY, width: sender.view!.frame.size.width, height: sender.view!.frame.size.height)
sender.view?.addSubview(customPickerView!)
self.showView(sender.view!)
}
/// Function which is used to show Picker in base View
func showView(_ sender: UIView) {
customPickerView?.removeFromSuperview()
sender.addSubview(customPickerView!)
UIView.animate(withDuration: 0.2) {
self.customPickerView?.frame = CGRect(x: 0, y: 0, width: sender.frame.size.width, height: sender.frame.size.height)
}
}
}
项目选择器 View XIB
您的项目选择器类
import UIKit
protocol ItemPickerDelegate {
func pickerCancelled()
func pickerDone()
func itemPicked(with item:String)
}
/// Assign Class to UIView
class ItemPicker: UIView {
/// After assigning FileOwner to ItemPicker Class
/// Create ContentView Outlet
@IBOutlet var contentView: UIView!
/// IBOutlets
@IBOutlet weak var pickerView: UIPickerView!
/// Arrays
var itemPickerDelegate:ItemPickerDelegate!
var arrItems:[String] = ["Item1","Item2","Item3","Item5","Item6"]
/// Frame
override init(frame: CGRect) {
super.init(frame: frame)
loadNib()
}
required init?(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)
loadNib()
}
/// I am Here loading Nib names as "ItemPicker"
func loadNib() {
Bundle.main.loadNibNamed("ItemPicker", owner: self, options: [:])
// 2. Adding the 'contentView' to self (self represents the instance of a WeatherView which is a 'UIView').
addSubview(contentView)
// 3. Setting this false allows us to set our constraints on the contentView programtically
contentView.translatesAutoresizingMaskIntoConstraints = false
contentView.backgroundColor = UIColor.clear
// 4. Setting the constraints programatically
contentView.topAnchor.constraint(equalTo: topAnchor).isActive = true
contentView.bottomAnchor.constraint(equalTo: bottomAnchor).isActive = true
contentView.leftAnchor.constraint(equalTo: leftAnchor).isActive = true
contentView.rightAnchor.constraint(equalTo: rightAnchor).isActive = true
pickerView.delegate = self
pickerView.dataSource = self
}
func configureView(frame:CGRect) {
self.frame = frame
self.pickerView.delegate = self
self.pickerView.dataSource = self
}
//MARK:IBActions
@IBAction func actionCancel(_ sender: Any) {
// DILog.print(items: "actionCancel")
self.itemPickerDelegate.pickerCancelled()
}
@IBAction func actionDone(_ sender: Any) {
// DILog.print(items: "actionDone")
self.itemPickerDelegate.pickerDone()
}
}
extension ItemPicker:UIPickerViewDelegate
{
func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) { }
func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
return arrItems[row]
}
}
extension ItemPicker:UIPickerViewDataSource
{
func numberOfComponents(in pickerView: UIPickerView) -> Int {
return 1
}
func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
return arrItems.count
}
}
模拟器输出
驱动链接 https://drive.google.com/open?id=14ThRCsXXGMr6ckqaC8mxTiyDj4HrGkXu
关于ios - 无法在 iOS 的 uipicker View 中滚动？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/51095829/