0
因此，我有一個「BillSplitters」的傳送帶，並且在每個傳送帶項目上它應該顯示BillSplitter所具有的唯一項目。所以我得到fatal error: unexpectedly found nil while unwrapping an Optional value正常情況下，我可以慢慢磨練這樣的錯誤，我發現問題，但是當從一個逐行的斷點繼續它進入我不能遵循的iCarousel代碼。林也相信沒有什麼問題在我旋轉木馬，就好像我不addSubview（tableView），那麼它運行良好。它似乎也創建了第一對桌面視圖並將它們添加好，然後得到錯誤。下面是使用代碼IM：iCarousel中的TableView發現零，同時展開可選值
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
let splitter = allBillSplitters[carouselIndex]
if (splitter.items?.count)! > 0 {
return (splitter.items?.count)!
} else {
TableViewHelper.EmptyMessage("\(splitter.name!) has no items to pay for.\nGo back to assign some items to their name.", tableView: tableView)
return 0
}
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell: ItemCell = tableView.dequeueReusableCell(withIdentifier: "SplitterItemCell") as! ItemCell
let itemsSet = allBillSplitters[carouselIndex].items
let items = itemsSet?.allObjects as! [Item]
let item = items[indexPath.row]
let count = item.billSplitters?.count
if count! > 1 {
cell.name!.text = "\(item.name!) split \(count!) ways"
cell.price!.text = "£\(Double(item.price)/Double(count!))"
} else {
cell.name!.text = item.name!
cell.price!.text = "£\(item.price)"
}
return cell
}
func numberOfItems(in carousel: iCarousel) -> Int {
return allBillSplitters.count
}
我在幾個地方，因爲它是不能重新使用的項目，總是創造新的，我應該刪除下列功能的if let view = view聲明說。如果我將其留在創建第一個傳送帶項目時立即得到相同的錯誤，當我將其刪除時，它會在創建第三個傳送帶項目時發生。
func carousel(_ carousel: iCarousel, viewForItemAt index: Int, reusing view: UIView?) -> UIView {
carouselIndex = index
var splitterView: UIImageView
var nameLabel: UILabel
var emailLabel: UILabel
var totalLabel: UILabel
var tableView: UITableView
let splitter = allBillSplitters[index]
//reuse view if available, otherwise create a new view
if let view = view as? UIImageView {
splitterView = view
//get a reference to the label in the recycled view
nameLabel = splitterView.viewWithTag(1) as! UILabel
emailLabel = splitterView.viewWithTag(2) as! UILabel
totalLabel = splitterView.viewWithTag(3) as! UILabel
tableView = splitterView.viewWithTag(4) as! UITableView
} else {
let height = carousel.contentView.frame.height - 85
let width = carousel.contentView.frame.width - 80
//don't do anything specific to the index within
//this `if ... else` statement because the view will be
//recycled and used with other index values later
splitterView = UIImageView(frame: CGRect(x: 0, y: 0, width: width, height: height))
splitterView.layer.cornerRadius = 10
splitterView.clipsToBounds = true
splitterView.image = UIImage(data: splitter.image as! Data, scale:1.0)
splitterView.contentMode = .scaleAspectFit
splitterView.backgroundColor = UIColor(netHex: 0xCA9875)
let viewWidth = Int(splitterView.frame.width)
nameLabel = UILabel(frame: CGRect(x: 5, y: 0, width: viewWidth, height: 30))
nameLabel.backgroundColor = .clear
nameLabel.backgroundColor?.withAlphaComponent(0.1)
nameLabel.textAlignment = .left
nameLabel.font = nameLabel.font.withSize(20)
nameLabel.tag = 1
emailLabel = UILabel(frame: CGRect(x: 5, y: 30, width: viewWidth, height: 15))
emailLabel.backgroundColor = .clear
emailLabel.textAlignment = .left
emailLabel.font = emailLabel.font.withSize(15)
emailLabel.tag = 2
totalLabel = UILabel(frame: CGRect(x: 5, y: 45, width: viewWidth, height: 15))
totalLabel.backgroundColor = .clear
totalLabel.textAlignment = .left
totalLabel.font = totalLabel.font.withSize(15)
totalLabel.tag = 3
let tableViewHeight = height - 65
let frame = CGRect(x: 0, y: 65, width: width, height: tableViewHeight)
tableView = UITableView(frame: frame)
tableView.delegate = self
tableView.dataSource = self
tableView.tag = 4
totalLabel.backgroundColor = .clear
splitterView.addSubview(nameLabel)
splitterView.addSubview(emailLabel)
splitterView.addSubview(totalLabel)
splitterView.addSubview(tableView)
}
//set item label
//remember to always set any properties of your carousel item
//views outside of the `if (view == nil) {...}` check otherwise
//you'll get weird issues with carousel item content appearing
//in the wrong place in the carousel
nameLabel.text = "\(allBillSplitters[index].name!)"
emailLabel.text = "\(allBillSplitters[index].email!)"
totalLabel.text = "£\(allBillSplitters[index].total)"
return splitterView
}
func carousel(_ carousel: iCarousel, valueFor option: iCarouselOption, withDefault value: CGFloat) -> CGFloat {
switch option {
case .spacing:
return value * 1.2
case .fadeMin:
return 0.0
case .fadeMinAlpha:
return 0.3
case .fadeMax:
return 0.0
default:
return value
}
}
我已經找遍了所有，找不到解決方案，所以任何幫助將是偉大的。謝謝