用数组中的数据实现静态表视图单元

Question

I have some data which is pulled from a DB and stored in an array within my UITableViewController . However, when I try to put the data inside each of my cells, I get an error that my index is out of the bounds of the array.

override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    return cellItems.count
}

override func numberOfSections(in tableView: UITableView) -> Int {
    return 1
}

override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
    let item: ItemPreBasketModel = cellItems[indexPath.row] as! ItemPreBasketModel
    if indexPath.row == 0 {
        //Desc cell
        let cellIdentifier: String = "descCell"
        let descCell: UITableViewCell = tableView.dequeueReusableCell(withIdentifier: cellIdentifier)!
        return descCell
    } else if indexPath.row == 1 {
        //Price cell
        let cellIdentifier: String = "priceCell"
        let priceCell: UITableViewCell = tableView.dequeueReusableCell(withIdentifier: cellIdentifier)!
        return priceCell
    } else if indexPath.row == 2 {
        //Quantity cell
        let cellIdentifier: String = "quantityCell"
        let quantityCell: UITableViewCell = tableView.dequeueReusableCell(withIdentifier: cellIdentifier)!
        return quantityCell
    } else {
        //Submit cell
        let cellIdentifier: String = "submitCell"
        let submitCell: UITableViewCell = tableView.dequeueReusableCell(withIdentifier: cellIdentifier)!
        return submitCell
    }
}

Here is the cellItems variable and also where it is populated:

var cellItems: NSArray = NSArray() {
    didSet {
        tableView.reloadData()
    }
}

    func itemsDownloaded(items: NSArray) {
    cellItems = items
    tableView.reloadData()
}

Here is the static table view in the storyboard:

What I want to do, which I've took out of the code for as it still fails before reaching this part, is to use the 'item' variable I declare inside cellForRowAt and populate each of my cell outlets with a part of the object,

ie: descCell.descLabel.text = item.name

The error I get is:

Thread 1: Fatal error: Unexpectedly found nil while unwrapping an Optional value

on the line

let descCell: UITableViewCell = tableView.dequeueReusableCell(withIdentifier: cellIdentifier)!

Answer 1

You should not use a table view controller with static cells and cellForRowAt at the same time. You should use dynamic prototypes to populate an array dynamically.

To change the content type of your table view, select it in Interface Bulder, open the Attributes inspector (the fourth icon from the left in the right sidebar) and select Dyanmic Prototypes for Content under the Table View section.