Swift 表格视图返回我字典的一些单元格

Question

Hi guys I want to show only 100 cells from my (10k+) records dict. Im trying to do this with return 100, but its giving me error - index out of range and this is normal behavior for this, but I don't know how to make it good as I want.. :(

Problem is, that I want to show only 100cells but I want to search for everyone of dict.. here is my code:

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

    override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        let count = self.items.count
        return 100
    }

    override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
        let item: Price = items[indexPath.row]

        tableView.selectRow(at: IndexPath(row: -1, section: 0), animated: false, scrollPosition: UITableViewScrollPosition.none)

        showLargePhoto(price: item)
    }

    override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell = tableView.dequeueReusableCell(withIdentifier: "CatalystItem", for: indexPath) as! CatalystTableViewCell
        let item: Price = items[indexPath.row]
        let appSettings: AppSettings = AppSettings()

        cell.lpLabel.text = String(item.no)
        cell.catCermaicValueLabel.text = "\(item.ceramWeight) kg"

        if appSettings.getHideMetalWeights() == false {
            cell.catPtValueLabel.text = item.viewPt ?? ""
            cell.catPdValueLabel.text = item.viewPd ?? ""
            cell.catRhValueLabel.text = item.viewRh ?? ""
        }
        else {
            cell.catPtValueLabel.text = ""
            cell.catPdValueLabel.text = ""
            cell.catRhValueLabel.text = ""
        }

        cell.textCategoryLabel?.text = item.group ?? ""

if FileUtilities.fileExists(nridasnString+".jpg") {
            let image: UIImage? = UIImage(named: tmbLocalPath.path)
            let scaledImage: UIImage? = image?.scaleToWidth(width: 100)

            if cell.imageView != nil {
                cell.imageView!.removeFromSuperview()

                let iv: UIImageView = UIImageView(frame: CGRect(x: 20, y: 40, width: 100, height: 75))
                iv.image = scaledImage
                iv.contentMode = .scaleAspectFit

                cell.addSubview(iv)
            }
        }

        return cell
    }

and I don't know how to make it... kill me please but Im done with it..

Answer 1

Replace

override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    let count = self.items.count
    return 100
}

with

override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int { 
    return min(100,self.items.count)
}

Answer 2

When you return 100 cells but you don't have 100 elements you get a classic "array out of items" "out of bounds".

You should be aware of this and check that you have indeed enough data to fill those cells or either reduce the number of cells.

Please replace the current delegate method numberOfRowsInSection :

override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    let count = self.items.count
    return 100
}

by

override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int { 
    return min(100,self.items.count)
}

You have a nice day and Welcome!