问题描述
我正在尝试将 SwiftUI 预览画布添加到我的 uikit 项目中,如下所示。但我收到一个错误。我怎样才能摆脱这个错误,以便我可以看到我的预览?
错误是无法在预览中将类型为“DonationCell”的返回表达式转换为返回类型“UIViewController”。
提前致谢。
class DonationCell: BaseCell {
private lazy var containerView: UIView = {
let view = UIView()
view.backgroundColor = .white
view.layer.cornerRadius = 8
//view.layer.applyButtonShadow()
//view.clipsToBounds = true
return view
}()
extension DonationCell: SetupCodeView {
func setupAdditionalConfiguration() {
self.backgroundColor = Constants.Colors.backgroundColor
}
func buildViewHierarchy() {
self.contentView.addSubviews(containerView)
}
func setupConstraints() {
containerView.anchor(
top: self.topAnchor,leading: self.leadingAnchor,bottom: self.bottomAnchor,trailing: self.trailingAnchor,padding: .init(top: 0,left: 0,bottom: 0,right: 0)
)
}
import SwiftUI
struct MainPreview: PreviewProvider {
static var previews: some View {
ContainerView().edgesIgnoringSafeArea(.all)
}
struct ContainerView: UIViewControllerRepresentable {
func makeUIViewController(context: UIViewControllerRepresentableContext<MainPreview.ContainerView>) -> UIViewController {
return DonationCell() // Cannot convert return expression of type 'DonationCell' to return type 'UIViewController'
}
func updateUIViewController(_ uiViewController: MainPreview.ContainerView.UIViewControllerType,context: UIViewControllerRepresentableContext<MainPreview.ContainerView>) {
}
}
}
还有我的 BaseCell
class BaseCell: UICollectionViewCell {
let font = Constants.Fonts.self
let colors = Constants.Colors.self
let buttonTitle = Constants.ButtonTitles.self
let constraint = Constants.Constraints.self
let shadow = Constants.Shadows.self
override init(frame: CGRect) {
super.init(frame: frame)
setupViews()
}
func setupViews() {
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not veen implemented")
}
}
class BaseHeader: UICollectionReusableView {
override init(frame: CGRect) {
super.init(frame: frame)
setupViews()
}
func setupViews() {
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not veen implemented")
}
}
解决方法
您的 00000200:
是一个 DonationCell
,而不是控制器,因此应该具有代表性
UIView