我有一个CollectionView，它已填满整个屏幕，具有水平scrollDirection并启用了分页。它位于带有隐藏的NavigationController的{{1}}内部。 navigationBar也具有屏幕的高度。
我期望发生的事情：
每个单元格将填满整个屏幕，当我向左/向右滑动时，将出现另一个单元格并填满整个屏幕。
实际发生的情况：
单元格未填满整个屏幕。单元格的顶部和屏幕的顶部边框之间有一个很小的空间（大约20像素）。单元格的底部（也大约20像素）位于屏幕底部边框的下方。
我也收到警告：
由于以下原因，未定义UICollectionViewFlowLayout的行为：
项目高度必须小于UICollectionView的高度减去该部分可插入的顶部和底部值，再减去内容可插入的顶部和底部值。
因此，像元高度看起来正确，但是y值错误。
我已经尝试过的方法：
CollectionViewCells返回true。
您会看到here，蓝色边框是collectionView的边框，红色边框是单元格的边框。正如我所期望的那样，蓝色边框是，但我希望红色边框像蓝色边框一样。
代码如下：
override shouldInvalidateLayoutForBoundsChangePageCell：
class LoginController: UIViewController, UICollectionViewDataSource, UICollectionViewDelegate, UICollectionViewDelegateFlowLayout, LoginControllerDelegate, UIGestureRecognizerDelegate {
lazy var loginCollectionView: UICollectionView = {
let layout = UICollectionViewFlowLayout()
layout.scrollDirection = .horizontal
layout.minimumLineSpacing = 0
let cv = UICollectionView(frame: .zero, collectionViewLayout: layout)
cv.dataSource = self
cv.delegate = self
cv.isPagingEnabled = true
cv.layer.borderWidth = 1.0
cv.layer.borderColor = UIColor.blue.cgColor
return cv
}()
let introCellId = "IntroCellId"
let loginCellId = "LoginCellId"
let pages: [Page] = {
let firstPage = Page(title: String,
message: String,
imageName: String)
let secondPage = Page(title: String,
message: String,
imageName: String)
let thirdPage = Page(title: String,
message: String,
imageName: String)
return [firstPage, secondPage, thirdPage]
}()
override func viewDidLoad() {
super.viewDidLoad()
navigationController?.navigationBar.isHidden = true
view.addSubview(loginCollectionView)
registerCells()
}
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return pages.count + 1
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
if indexPath.item == pages.count {
let loginCell = collectionView.dequeueReusableCell(withReuseIdentifier: loginCellId, for: indexPath) as! LoginCell
loginCell.loginControllerDelegate = self
loginCell.layer.borderColor = UIColor.red.cgColor
loginCell.layer.borderWidth = 2.0
return loginCell
}
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: introCellId, for: indexPath) as! PageCell
let page = pages[indexPath.item]
cell.page = page
cell.layer.borderColor = UIColor.red.cgColor
cell.layer.borderWidth = 2.0
return cell
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
return CGSize(width: self.loginCollectionView.frame.width, height: self.loginCollectionView.frame.height)
}
}
LoginCell：
class PageCell: UICollectionViewCell {
var page: Page? {
didSet {
guard let page = page
else {
return
}
imageView.image = UIImage(named: page.imageName)
let color = UIColor(white: 0.2, alpha: 1)
let attributedText = NSMutableAttributedString(string: page.title, attributes: [NSAttributedString.Key.font: UIFont.systemFont(ofSize: 18, weight: UIFont.Weight.medium), NSAttributedString.Key.foregroundColor: color])
attributedText.append(NSMutableAttributedString(string: "\n\n\(page.message)", attributes: [NSAttributedString.Key.font: UIFont.systemFont(ofSize: 15, weight: UIFont.Weight.medium), NSAttributedString.Key.foregroundColor: color]))
let paragraphStyle = NSMutableParagraphStyle()
paragraphStyle.alignment = .center
let length = attributedText.string.count
attributedText.addAttributes([NSAttributedString.Key.paragraphStyle: paragraphStyle], range: NSRange(location: 0, length: length))
textView.attributedText = attributedText
}
}
override init(frame: CGRect) {
super.init(frame: frame)
setupViews()
}
let imageView: UIImageView = {
let iv = UIImageView()
iv.contentMode = .scaleAspectFill
iv.backgroundColor = UIColor(displayP3Red: 139/255, green: 221/255, blue: 116/255, alpha: 1)
iv.clipsToBounds = true
return iv
}()
let textView: UITextView = {
let tv = UITextView()
tv.isEditable = false
tv.contentInset = UIEdgeInsets(top: 24, left: 0, bottom: 0, right: 0)
tv.textColor = UIColor(displayP3Red: 51/255, green: 51/255, blue: 51/255, alpha: 1)
return tv
}()
func setupViews() {
addSubview(imageView)
addSubview(textView)
_ = imageView.anchor(topAnchor, left: leftAnchor, bottom: nil, right: rightAnchor, topConstant: 0, leftConstant: 0, bottomConstant: 0, rightConstant: 0, widthConstant: screenWidth, heightConstant: (screenHeight) / 2)
_ = textView.anchor(imageView.bottomAnchor, left: leftAnchor, bottom: bottomAnchor, right: rightAnchor, topConstant: 0, leftConstant: 0, bottomConstant: 0, rightConstant: 0, widthConstant: screenWidth, heightConstant: (screenHeight) / 2)
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been impremented")
}
}
Anchor方法：
class LoginCell: UICollectionViewCell {
let logoImageView: UIImageView = {
let image = UIImage(named: "logo green")
let imageView = UIImageView(image: image)
return imageView
}()
let emailTextField: UITextField = {
let textField = UITextField()
textField.placeholder = "E-Mail"
textField.layer.borderColor = UIColor.lightGray.cgColor
let border = CALayer()
border.frame = CGRect(x: 0, y: 40, width: UIScreen.main.bounds.width - 64, height: 2.0)
border.backgroundColor = UIColor(displayP3Red: 51/255, green: 51/255, blue: 51/255, alpha: 1).cgColor
textField.layer.addSublayer(border)
textField.keyboardType = .emailAddress
return textField
}()
let emailAlertLabel: UILabel = {
let label = UILabel()
label.text = "E-Mail-Adresse nicht gefunden"
label.textColor = .red
label.isHidden = true
return label
}()
let passwordTextField: UITextField = {
let textField = UITextField()
textField.placeholder = "Passwort"
textField.layer.borderColor = UIColor.lightGray.cgColor
let border = CALayer()
border.frame = CGRect(x: 0, y: 40, width: UIScreen.main.bounds.width - 64, height: 2.0)
border.backgroundColor = UIColor(displayP3Red: 51/255, green: 51/255, blue: 51/255, alpha: 1).cgColor
textField.layer.addSublayer(border)
textField.isSecureTextEntry = true
return textField
}()
let passwordAlertLabel: UILabel = {
let label = UILabel()
label.text = "Ungültiges Passwort"
label.textColor = .red
label.isHidden = true
return label
}()
lazy var forgotPasswordButton: UIButton = {
let button = UIButton(type: .system)
button.backgroundColor = .white
button.setTitle("Passwort vergessen?", for: .normal)
button.setTitleColor(UIColor(displayP3Red: 139/255, green: 221/255, blue: 116/255, alpha: 1), for: .normal)
button.addTarget(self, action: #selector(handleForgotPassword), for: .touchUpInside)
button.contentHorizontalAlignment = .left
return button
}()
lazy var loginButton: UIButton = {
let button = UIButton(type: .system)
button.backgroundColor = UIColor(displayP3Red: 139/255, green: 221/255, blue: 116/255, alpha: 1)
button.setTitle("Login", for: .normal)
button.setTitleColor(.white, for: .normal)
button.addTarget(self, action: #selector(checkUserData), for: .touchUpInside)
button.layer.cornerRadius = 25.0
return button
}()
weak var loginControllerDelegate: LoginControllerDelegate?
lazy var stayLoggedInSwitch: UISwitch = {
let loginSwitch = UISwitch(frame: CGRect(x: 150, y: 150, width: 0, height: 0))
loginSwitch.addTarget(self, action: #selector(LoginCell.handleStayLoggedInState(_:)), for: .valueChanged)
loginSwitch.setOn(false, animated: true)
return loginSwitch
}()
let stayLoggedInTextField: UITextField = {
let textField = UITextField()
textField.text = "Angemeldet bleiben"
textField.textColor = UIColor(displayP3Red: 51/255, green: 51/255, blue: 51/255, alpha: 1)
textField.isUserInteractionEnabled = false
return textField
}()
let registerLabel: UILabel = {
let label = UILabel()
label.text = "Sie haben noch keinen Account?"
label.textColor = .lightGray
label.backgroundColor = .white
label.font = label.font.withSize(13)
return label
}()
lazy var registerButton: UIButton = {
let button = UIButton(type: .system)
button.backgroundColor = .white
button.setTitle("Registrieren", for: .normal)
button.setTitleColor(UIColor(displayP3Red: 139/255, green: 221/255, blue: 116/255, alpha: 1), for: .normal)
button.addTarget(self, action: #selector(handleRegister), for: .touchUpInside)
button.contentHorizontalAlignment = .left
button.titleLabel?.font = button.titleLabel?.font.withSize(13)
return button
}()
override init(frame: CGRect) {
super.init(frame: frame)
setupViews()
}
func setupViews() {
addSubview(logoImageView)
addSubview(emailTextField)
addSubview(emailAlertLabel)
addSubview(passwordTextField)
addSubview(passwordAlertLabel)
addSubview(forgotPasswordButton)
addSubview(loginButton)
addSubview(stayLoggedInSwitch)
addSubview(stayLoggedInTextField)
addSubview(registerLabel)
addSubview(registerButton)
_ = logoImageView.anchor(centerYAnchor, left: nil, bottom: nil, right: nil, topConstant: -230, leftConstant: 0, bottomConstant: 0, rightConstant: 0, widthConstant: 160, heightConstant: 160)
logoImageView.centerXAnchor.constraint(equalTo: centerXAnchor).isActive = true
_ = emailTextField.anchor(logoImageView.bottomAnchor, left: leftAnchor, bottom: nil, right: rightAnchor, topConstant: 35, leftConstant: 32, bottomConstant: 0, rightConstant: 32, widthConstant: 0, heightConstant: 50)
_ = emailAlertLabel.anchor(emailTextField.bottomAnchor, left: leftAnchor, bottom: nil, right: rightAnchor, topConstant: 0, leftConstant: 32, bottomConstant: 0, rightConstant: 32, widthConstant: 0, heightConstant: 20)
_ = passwordTextField.anchor(emailAlertLabel.bottomAnchor, left: leftAnchor, bottom: nil, right: rightAnchor, topConstant: 0, leftConstant: 32, bottomConstant: 0, rightConstant: 32, widthConstant: 0, heightConstant: 50)
_ = passwordAlertLabel.anchor(passwordTextField.bottomAnchor, left: leftAnchor, bottom: nil, right: rightAnchor, topConstant: 0, leftConstant: 32, bottomConstant: 0, rightConstant: 32, widthConstant: 0, heightConstant: 20)
_ = forgotPasswordButton.anchor(passwordAlertLabel.bottomAnchor, left: leftAnchor, bottom: nil, right: nil, topConstant: 0, leftConstant: 32, bottomConstant: 0, rightConstant: 0, widthConstant: 200, heightConstant: 25)
_ = loginButton.anchor(forgotPasswordButton.bottomAnchor, left: leftAnchor, bottom: nil, right: rightAnchor, topConstant: 4, leftConstant: 32, bottomConstant: 0, rightConstant: 32, widthConstant: 0, heightConstant: 50)
_ = stayLoggedInSwitch.anchor(loginButton.bottomAnchor, left: leftAnchor, bottom: nil, right: nil, topConstant: 16, leftConstant: 32, bottomConstant: 0, rightConstant: 0, widthConstant: 60, heightConstant: 50)
_ = stayLoggedInTextField.anchor(loginButton.bottomAnchor, left: stayLoggedInSwitch.rightAnchor, bottom: nil, right: rightAnchor, topConstant: 16, leftConstant: 0, bottomConstant: 0, rightConstant: 32, widthConstant: 0, heightConstant: 32)
_ = registerLabel.anchor(nil, left: leftAnchor, bottom: bottomAnchor, right: nil, topConstant: 0, leftConstant: 32, bottomConstant: 32, rightConstant: 0, widthConstant: 200, heightConstant: 25)
_ = registerButton.anchor(nil, left: registerLabel.rightAnchor, bottom: bottomAnchor, right: rightAnchor, topConstant: 0, leftConstant: 0, bottomConstant: 32, rightConstant: 32, widthConstant: 0, heightConstant: 25)
emailTextField.addTarget(self, action: #selector(underlineTextFieldColor(sender:)), for: .editingDidBegin)
emailTextField.addTarget(self, action: #selector(underlineTextFieldDark(sender:)), for: .editingDidEnd)
passwordTextField.addTarget(self, action: #selector(underlineTextFieldColor(sender:)), for: .editingDidBegin)
passwordTextField.addTarget(self, action: #selector(underlineTextFieldDark(sender:)), for: .editingDidEnd)
}
@objc func underlineTextFieldDark(sender: UITextField) {
sender.layer.sublayers![0].backgroundColor = UIColor(displayP3Red: 51/255, green: 51/255, blue: 51/255, alpha: 1).cgColor
}
@objc func underlineTextFieldColor(sender: UITextField) {
sender.layer.sublayers![0].backgroundColor = UIColor(displayP3Red: 139/255, green: 221/255, blue: 116/255, alpha: 1).cgColor
}
@objc func handleLogin() {
loginControllerDelegate?.finishLoggingIn()
}
@objc func handleStayLoggedInState(_ sender: UISwitch) {
if (sender.isOn == true) {
UserDefaults.standard.setIsLoggedIn(value: true)
}
else {
UserDefaults.standard.setIsLoggedIn(value: false)
}
}
@objc func handleForgotPassword() {
loginControllerDelegate?.finishLoggingIn()
}
@objc func handleRegister() {
loginControllerDelegate?.finishLoggingIn()
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
}
答案 0 :(得分：0)
集合视图自动设置为整个视图。如果您未设置任何行为，collectionView的内容将能够自动调整昆虫。在这种情况下，将自动调整设置为false以获得全屏视图。屏幕的顶部和底部有一个安全区域，用于调整带有缺口的视图。
尝试一下
collectionView?.contentInsetAdjustmentBehavior = .never
希望这可以解决此问题。