我正在尝试设计一个多步骤注册菜单。为此，我将UICollectionViewController用于屏幕大小的单元格。在这些单元格中，我有一个UITextView来提问，还有一个UITextField来收集答案。我还有一个页面对象，用于在设置时从uicollectionviewcontroller传入信息。
我现在遇到的问题是，在每三页之后，我从3页前输入的文本字段就会重复，而不是显示占位符。我注意到了另一个问题，这些单元格的实例化次数似乎只有3次，而不是6次。实例化顺序也很奇怪。一开始它只做一次，然后按一下按钮，再按两次，然后再不按了。
怎么能解决这个问题，我真的很挣扎，我不知道怎么回事。
这是我的代码：
import UIKit
class OnboardingPageViewCell: UICollectionViewCell{
override init(frame: CGRect) {
super.init(frame: frame)
print("made a page")
setupView()
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
var oboardingPage = NewOnboardingPage() {
didSet{
reload()
}
}
private var questionTextField: UITextView = {
var q = UITextView()
q.textColor = UIColor.white
q.textAlignment = .left
q.font = UIFont(name: "Avenir-Black", size: 25)
q.isEditable = true
q.isScrollEnabled = false
q.backgroundColor = UIColor.black
q.translatesAutoresizingMaskIntoConstraints = false
print("made aquestion field")
return q
}()
private var answerField : CustomTextField = {
let tf = CustomTextField.nameField
print("made an answer field")
return tf
}()
private func setupView(){
backgroundColor = UIColor.white
addSubview(questionTextField)
questionTextField.topAnchor.constraint(equalTo: topAnchor, constant: 120).isActive = true
questionTextField.leftAnchor.constraint(equalTo: leftAnchor).isActive = true
questionTextField.widthAnchor.constraint(equalTo: widthAnchor, multiplier: 0.90).isActive = true
questionTextField.heightAnchor.constraint(equalToConstant: 90).isActive = true
addSubview(answerField)
answerField.topAnchor.constraint(equalTo: questionTextField.bottomAnchor, constant: 20).isActive = true
answerField.leftAnchor.constraint(equalTo: leftAnchor).isActive = true
answerField.widthAnchor.constraint(equalTo: widthAnchor, multiplier: 0.90).isActive = true
answerField.heightAnchor.constraint(equalToConstant: 90).isActive = true
}
private func reload(){
questionTextField.text = oboardingPage.question
answerField.placeholder = oboardingPage.answerField
}
}
class NewOnboardingPage {
var question : String?
var answerField : String?
}
import UIKit
class SignUpController: UICollectionViewController, UICollectionViewDelegateFlowLayout {
private let cellId = "cellId"
private var pages = [NewOnboardingPage]()
override func viewDidLoad() {
super .viewDidLoad()
setupSignUpControllerView()
addPages()
}
private func addPages(){
let namePage = NewOnboardingPage()
namePage.question = "What's your name?"
namePage.answerField = "What's your name?"
pages.append(namePage)
let birthDayPage = NewOnboardingPage()
birthDayPage.question = "When's your birthdate?"
birthDayPage.answerField = "When's your birthdate?"
pages.append(birthDayPage)
let userNamePage = NewOnboardingPage()
userNamePage.question = "Choose a user name."
userNamePage.answerField = "Choose a user name."
pages.append(userNamePage)
let passWordPage = NewOnboardingPage()
passWordPage.question = "Set a password"
passWordPage.answerField = "Set a password"
pages.append(passWordPage)
let emailAuthPage = NewOnboardingPage()
emailAuthPage.question = "What's your email?"
emailAuthPage.answerField = "What's your email?"
pages.append(emailAuthPage)
let phoneNumberPage = NewOnboardingPage()
phoneNumberPage.question = "What's your phone number?"
phoneNumberPage.answerField = "What's your phone number?"
pages.append(phoneNumberPage)
}
private func setupSignUpControllerView(){
collectionView?.backgroundColor = .white
collectionView?.register(OnboardingPageViewCell.self, forCellWithReuseIdentifier: cellId)
collectionView?.isPagingEnabled = true
collectionView?.isScrollEnabled = true
if let layout = collectionView?.collectionViewLayout as? UICollectionViewFlowLayout {
layout.scrollDirection = .horizontal
layout.minimumLineSpacing = 0
}
view.addSubview(nextButton)
nextButton.topAnchor.constraint(equalTo: view.topAnchor, constant: 400).isActive = true
nextButton.centerXAnchor.constraint(equalTo: view.centerXAnchor).isActive = true
nextButton.widthAnchor.constraint(equalToConstant: 250).isActive = true
nextButton.heightAnchor.constraint(equalToConstant: 60).isActive = true
}
private let nextButton: UIButton = {
let button = UIButton(type: .system)
button.backgroundColor = UIColor.RED
button.setTitle("next", for: .normal)
button.setTitleColor(UIColor.white, for: .normal)
button.titleLabel?.font = UIFont(name: "Avenir-Black", size: 25)
button.layer.cornerRadius = 30
button.translatesAutoresizingMaskIntoConstraints = false
button.addTarget(self, action: #selector(turnNextPage), for: .touchUpInside)
return button
}()
@objc private func turnNextPage() {
let visibleItems: NSArray = collectionView?.indexPathsForVisibleItems as! NSArray
let currentItem: IndexPath = visibleItems.object(at: 0) as! IndexPath
let nextItem: IndexPath = IndexPath(item: currentItem.item + 1, section: 0)
if nextItem.row < pages.count {
collectionView?.scrollToItem(at: nextItem, at: .left, animated: true)
}
}
override func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return pages.count
}
override func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: cellId, for: indexPath) as! OnboardingPageViewCell
cell.oboardingPage = pages[indexPath.item]
return cell
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
return CGSize(width: view.frame.width, height: view.frame.height)
}
}
import UIKit
class CustomTextField: UITextField, UITextFieldDelegate {
convenience init() {
self.init(frame: CGRect(x: 0, y: 0, width: 0, height: 0))
self.allowsEditingTextAttributes = false
self.autocorrectionType = .no
self.tintColor = UIColor.RED
self.translatesAutoresizingMaskIntoConstraints = false
}
override func willMove(toSuperview newSuperview: UIView?) {
addTarget(self, action: #selector(editingChanged), for: .editingChanged)
editingChanged(self)
}
@objc func editingChanged(_ textField: UITextField) {
guard let text = textField.text else { return }
textField.text = String(text.prefix(30))
}
override func selectionRects(for range: UITextRange) -> [Any] {
return []
}
override func canPerformAction(_ action: Selector, withSender sender: Any?) -> Bool {
if action == #selector(paste(_:)) ||
action == #selector(cut(_:)) ||
action == #selector(copy(_:)) ||
action == #selector(select(_:)) ||
action == #selector(selectAll(_:)){
return false
}
return super.canPerformAction(action, withSender: sender)
}
}
override func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: cellId, for: indexPath) as! OnboardingPageViewCell
cell.answerField.text = nil
cell.oboardingPage = pages[indexPath.item]
return cell
}
最佳答案
1-由于单元格出列，textfield显示的是相同的数据，而不是占位符，因此必须挂接这些属性并清除它们在cellForRowAt中的内容
2-实例化为3而不是6 aslo单元出列
解决：
将两个属性添加到模型NewOnboardingPage将它们命名为currentQuestion和currentAnswer，并作为用户输入滚动到下一页将它们保存在modelarray中，以便在单元格内部和外部进行全局访问在cellForRowAt中滚动时将这些值设置为textfield和textView
关于ios - UICollectionViewCell的UiTextField，在UICollectionViewController中重叠，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/47961579/