ios - 类型转换细胞类型出队的问题

Question

嗨，我在cellForItemAt中遇到问题，其错误如下。我不明白为什么我无法投射细胞。它发生在else语句的第一行。

列出的UIView的UIConstraintBasedLayoutDebugging类别中的方法也可能会有所帮助。

无法将类型'Spoexs.MenuCell2'(0x10d059660)的值强制转换为'Spoexs.MenuCell1'(0x10d0595c0)。

导入UIKit
导入MIBadgeButton_Swift

class SecondMenuBar:UIView，UICollectionViewDataSource，UICollectionViewDelegate，UICollectionViewDelegateFlowLayout {

懒惰的var collectionView:UICollectionView = {
让layout = UICollectionViewFlowLayout()
让cv = UICollectionView(frame:.zero，collectionViewLayout:layout)
cv.backgroundColor = UIColor.rgb(r:240，g:240，b:240)
cv.dataSource =自我
cv.delegate =自我
返回简历
}()

让cellId =“cellId”
让cellId2 =“cellId2”

let menuItems = [“库存”，“结帐”，“扫描仪”]
varventoryController:InventoryTabController？

覆盖init(frame:CGRect){//运行时
super.init(frame:框架)

collectionView.register(MenuCell1.self，
forCellWithReuseIdentifier:cellId)//注册 super class

collectionView.register(MenuCell2.self，
forCellWithReuseIdentifier:cellId)//注册 super class

addSubview(collectionView)
addConstraintsWithFormat(“H:| [v0] |”，views:collectionView)
addConstraintsWithFormat(“V:| [v0] |”，views:collectionView)

让selectedIndexPath = NSIndexPath(item:0，section:0)
collectionView.selectItem(at:selectedIndexPath as IndexPath，动画:false，scrollPosition:[])//运行时主页按钮发光

//设置单杠
Slider()
NotificationCenter.default.addObserver(forName:.arrayValueChanged，object:nil，queue:OperationQueue.main){[弱自我](notif)在
徽章=“\(checkout.count)”
自我？.collectionView.reloadData()
}
}

deinit {
NotificationCenter.default.removeObserver(个体)
}

var horizo​​ntalBarLeftAnchorConstraint:NSLayoutConstraint？

func slide(){
让horizo​​ntalBarView = UIView()
如果#available(iOS 10.0，*){
horizo​​ntalBarView.backgroundColor = UIColor(displayP3Red:0.29，green:0.78，blue:0.47，alpha:0.2)
}其他{
horizo​​ntalBarView.backgroundColor = UIColor.rgb(r:190，g:190，b:190)
}
horizo​​ntalBarView.translatesAutoresizingMaskIntoConstraints = false
addSubview(horizo​​ntalBarView)//添加到层次结构

//需要x，y坐标
horizo​​ntalBarLeftAnchorConstraint = horizo​​ntalBarView.leftAnchor.constraint(equalTo:self.leftAnchor)
horizo​​ntalBarLeftAnchorConstraint？.isActive = true

horizo​​ntalBarView.bottomAnchor.constraint(equalTo:self.bottomAnchor).isActive = true
horizo​​ntalBarView.widthAnchor.constraint(等于:self.widthAnchor，乘数:1/3).isActive = true
horizo​​ntalBarView.heightAnchor.constraint(equalToConstant:3).isActive = true
}

func collectionView(_ collectionView:UICollectionView，didSelectItemAt indexPath:IndexPath){
库存控制器？.scrollToMenuInde​​x(菜单索引:indexPath.item)
打印(“在这里\(indexPath.section)”)
打印(“在这里\(indexPath.item)”)
}

func collectionView(_ collectionView:UICollectionView，layout collectionViewLayout:UICollectionViewLayout，sizeForItemAt indexPath:IndexPath)-> CGSize {
返回CGSize(width:frame.width / 3，height:frame.height)
}

func collectionView(_ collectionView:UICollectionView，layout collectionViewLayout:UICollectionViewLayout，minimumInteritemSpacingForSectionAt部分:Int)-> CGFloat {
返回0
}

func collectionView(_ collectionView:UICollectionView，
numberOfItemsInSection部分:Int)-> Int {
返回3
}

func collectionView(_ collectionView:UICollectionView，cellForItemAt indexPath:IndexPath)-> UICollectionViewCell {

如果indexPath.section == 1 {
让cell = collectionView.dequeueReusableCell(withReuseIdentifier:cellId2，for:indexPath)为! MenuCell2
cell.imageView2.setImage(UIImage(named:menuItems [indexPath.section])?. withRenderingMode(.alwaysTemplate)，用于:.normal)
cell.imageView2.badgeString =徽章
cell.tintColor = UIColor.rgb(r:255，g:0，b:255)//设置色彩
返回单元
}其他{
让cell = collectionView.dequeueReusableCell(withReuseIdentifier:cellId，for:indexPath)为! MenuCell1
cell.imageView1.image = UIImage(named:menuItems [indexPath.section])?. withRenderingMode(.alwaysTemplate)
cell.tintColor = UIColor.rgb(r:255，g:0，b:255)//设置色彩
返回单元
}
}

需要初始化吗？(编码器aDecoder:NSCoder){
fatalError(“init(coder :)尚未实现”)
}

}

class MenuCell1:UICollectionViewCell {

覆盖init(frame:CGRect){
super.init(frame:框架)
setupViews()

}

需要初始化吗？(编码器aDecoder:NSCoder){
fatalError(“init(coder :)尚未实现”)
}

让imageView1:UIImageView = {
让iv = UIImageView()
iv.image = UIImage(named:“”)?. withRenderingMode(.alwaysTemplate)
iv.tintColor = UIColor.rgb(r:144，g:157，b:255)//设置每个菜单图像bg的色彩
返回iv
}()

覆盖var isSelected:布尔{
didSet {
imageView1.tintColor = isSelected？ UIColor.rgb(r:76，g:200，b:120):UIColor.rgb(r:190，g:190，b:190)//选择为绿色否则为灰色
}
}

func setupViews(){

addSubview(imageView1)

addConstraintsWithFormat(“H:[v0(28)]”，视图:imageView1)
addConstraintsWithFormat(“V:[v0(28)]”，视图:imageView1)

addConstraint(NSLayoutConstraint(item:imageView1，attribute:.centerX，relatedBy:.equal，toItem:self，attribute:.centerX，multiplier:1，constant:0))//中心菜单图标
addConstraint(NSLayoutConstraint(item:imageView1，attribute:.centerY，relatedBy:.equal，toItem:self，attribute:.centerY，multiplier:1，constant:0))
}

}

class MenuCell2:UICollectionViewCell {

覆盖init(frame:CGRect){
super.init(frame:框架)
setupViews()

}

需要初始化吗？(编码器aDecoder:NSCoder){
fatalError(“init(coder :)尚未实现”)
}

让imageView2:MIBadgeButton = {
让按钮= MIBadgeButton()
var image = UIImage(named:“home”)?. withRenderingMode(.alwaysTemplate)
button.setImage(image，for:.normal)
button.badgeString =徽章
button.isUserInteractionEnabled = false
button.tintColor = UIColor.rgb(r:190，g:190，b:190)//内部按钮色调为灰色
返回按钮
}()

覆盖var isSelected:布尔{
didSet {
imageView2.tintColor = isSelected？ UIColor.rgb(r:76，g:200，b:120):UIColor.rgb(r:190，g:190，b:190)//选择为绿色否则为灰色
}
}

func setupViews(){

addSubview(imageView2)

addConstraintsWithFormat(“H:[v0(28)]”，视图:imageView2)
addConstraintsWithFormat(“V:[v0(28)]”，视图:imageView2)

addConstraint(NSLayoutConstraint(item:imageView2，attribute:.centerX，relatedBy:.equal，toItem:self，attribute:.centerX，multiplier:1，constant:0))//中心菜单图标
addConstraint(NSLayoutConstraint(item:imageView2，attribute:.centerY，relatedBy:.equal，toItem:self，attribute:.centerY，乘数:1，常量:0))

}

}

Answer 1

您注册单元格类的代码是错误的:

collectionView.register(MenuCell1.self, forCellWithReuseIdentifier: cellId)
collectionView.register(MenuCell2.self, forCellWithReuseIdentifier: cellId) // <-- probably not intended

您正在使用相同的 cellId注册这两个类，一个应该是 cellId2:

collectionView.register(MenuCell1.self, forCellWithReuseIdentifier: cellId)
collectionView.register(MenuCell2.self, forCellWithReuseIdentifier: cellId2)