查找表视图中所有数字的平均值

Question

下面的代码列出了表格视图中的数字。我要做的就是在视图加载功能中打印数字的平均值。 tableview从核心数据模型获取其编号。

        var scores = UITableView()
    var itemName : [NSManagedObject] = []
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    return itemName.count


}


    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {

        let title = itemName[indexPath.row]
        let cell = scores.dequeueReusableCell(withIdentifier: "MyCell", for: indexPath)
        cell.textLabel?.text = title.value(forKey: "ee") as? String
        cell.textLabel?.textAlignment = .center


        cell.preservesSuperviewLayoutMargins = false
        cell.separatorInset = UIEdgeInsets.zero
        cell.layoutMargins = UIEdgeInsets.zero

        return cell
    }





   override func viewDidLoad() {
    super.viewDidLoad()


    var  i = 0;
    var sum = 0;

    for i in 0...itemName.count
    {
        let title = itemName[i]
        let str : String = title.value(forKey: "ee") as! String
        sum = sum + Int(str)!
    }
    var avg = sum/itemName.count

    print("Score Is", avg)
    }

Answer 1

您可以使用for循环对视图加载方法中的值求和

    var  i = 0;
    var sum = 0;

    for i in 0...itemName.count-1
    {
        let title = itemName[i]
        let str :String = title.value(forKey: "ee")
        sum = sum + Int(str)
    }

    var avg = sum/itemName.count