通过滑动从NSTableview中删除行

Question

我正在尝试通过滑动功能从NStableView中删除一行。我使用的是macOS 10.13和Swift 4，并且是Swift编码的新手。

我尝试遵循：Implementing NSTableViewRowAction using Swift，但它对我不起作用。

这就是我的实现方式：

public func tableView(_ tableView: NSTableView, rowActionsForRow row: Int, edge: NSTableView.RowActionEdge) -> [NSTableViewRowAction] {
    // left swipe
    if edge == .trailing {
        let deleteAction = NSTableViewRowAction(style: .destructive, title: "Delete", handler: { (rowAction, row) in
            // action code
            List_Symbol.remove(at: row)
            List_Price.remove(at: row)
            List_Procent.remove(at: row)
            List_Volume.remove(at: row)
        })
        deleteAction.backgroundColor = NSColor.red
        return [deleteAction]
    }
    let archiveAction = NSTableViewRowAction(style: .regular, title: "Archive", handler: { (rowAction, row) in
        // action code
    })
    return [archiveAction]
}

还有其他建议如何通过滑动在NSTableView中删除行吗？

整个代码：

import Cocoa
import Alamofire

var List_Symbol = ["AAPL"]
var List_Price  = [10.0]
var List_Procent = [1.0]
var List_Volume = [100]


class ViewController: NSViewController, NSTableViewDataSource,     NSTableViewDelegate {
@IBOutlet weak var tableView: NSTableView!
@IBOutlet weak var input: NSTextField!
@IBAction func additem(_ sender: Any) {
    if (input.stringValue != ""){
        var Stock = StockInformation(symbol: input.stringValue)
        Stock.GetStockInformation {
            List_Symbol.append(Stock.Symbol)
            List_Price.append(Stock.Price)
            List_Procent.append(Stock.Percent)
            List_Volume.append(Stock.Volume)
            self.tableView.reloadData()
        }
        input.stringValue = ""
    }
    self.tableView.reloadData()
}

public func tableView(_ tableView: NSTableView, rowActionsForRow row: Int, edge: NSTableView.RowActionEdge) -> [NSTableViewRowAction] {
    // left swipe
    if edge == .trailing {
        let deleteAction = NSTableViewRowAction(style: .destructive, title: "Delete", handler: { (rowAction, row) in
            // action code
            List_Symbol.remove(at: row)
            List_Price.remove(at: row)
            List_Procent.remove(at: row)
            List_Volume.remove(at: row)
            tableView.removeRows(at: IndexSet(integer: row), withAnimation: .effectFade)
        })
        deleteAction.backgroundColor = NSColor.red
        return [deleteAction]
    }
    let archiveAction = NSTableViewRowAction(style: .regular, title: "Archive", handler: { (rowAction, row) in
        // action code
    })
    return [archiveAction]
}



override func viewDidAppear() {
    tableView.reloadData()
}


override func viewDidLoad() {
    super.viewDidLoad()

}
 func numberOfRows(in tableView: NSTableView) -> Int{
    return List_Symbol.count
}

 func tableView(_ tableView: NSTableView, objectValueFor tableColumn: NSTableColumn?, row: Int) -> Any?{
    var identifierStr = tableColumn!.identifier
    if (identifierStr.rawValue == "StockNameCellID"){
        return List_Symbol[row]
    }else if (identifierStr.rawValue == "PriceCellID"){
        return List_Price[row]
    }else if (identifierStr.rawValue == "PercentCellID"){
        return List_Procent[row]
    }else if (identifierStr.rawValue == "VolumeCellID"){
        return List_Volume[row]
    }
    tableView.reloadData()
    return nil
}

}

Answer 1

不要使用多个数组作为数据源，这太可怕了。

在macOS中，您可以用Cocoa绑定替换很多样板代码

•使用从public partial class multipleexcelimport : System.Web.UI.Page { protected void importfile() { String MyConString = "SERVER=localhost;" + "DATABASE=mysql_testing;" + "UID=root;" + "PASSWORD=tammy;SslMode=none"; if (this.uploadfile.HasFile) { string[] segments = fn.Split('.'); string fileExt = segments[segments.Length - 1]; if (fileExt != "xlsx") { showMessage("輸入錯誤", "請上傳正確檔案xlsx"); return; } foreach (var file in uploadfile.PostedFiles) { var fn = file.FileName; string newfileName = DateTime.Now.ToString("yyyyMMddHHmmss") + "_" + fn; string filepath = Server.MapPath(ConfigurationSettings.AppSettings["UPLOAD_FOLDER"]) + newfileName; this.uploadfile.SaveAs(filepath); ExcelPackage xlWorkbook = new ExcelPackage(new FileInfo(filepath)); ExcelWorksheet xlRange = xlWorkbook.Workbook.Worksheets[1]; int rowCount = xlRange.Dimension.End.Row; ExcelWorksheet xlRange2 = xlWorkbook.Workbook.Worksheets[2]; int rowCount2 = xlRange2.Dimension.End.Row; string sql = ""; string linkid = ""; MySqlConnection conn = null; MySqlDataAdapter msda = null; DataSet ds = null; List<string> FailList = new List<string>(); conn = new MySqlConnection(MyConString); DateTime dTime = DateTime.Now; string now_time = dTime.ToString("yyyy-MM-dd HH:mm:ss"); conn.Open(); conn.Close(); using (TransactionScope scope = new TransactionScope()) { try { conn.Open(); //sheet1 for (int i = 2; i <= rowCount; i++) { string dates = xlRange.Cells[i, 1].Value.ToString(); sql = "INSERT INTO mysql_testing.excel2 set" + " excel = ?dates;" ds = new DataSet(); msda = new MySqlDataAdapter(sql, conn); msda.SelectCommand.Parameters.AddWithValue("dates", dates); } //sheet2 for (int i = 2; i <= rowCount2; i++) { string excel3 = xlRange2.Cells[i, 1].Value.ToString(); sql = "INSERT INTO mysql_testing.excel3 set" + " excel3 = ?excel3;" ; ds = new DataSet(); msda = new MySqlDataAdapter(sql, conn); msda.SelectCommand.Parameters.AddWithValue("excel3", excel3); } showMessage("alert", "success"); scope.Complete(); } catch (Exception ex) { throw ex; } finally { conn.Close(); } } ScriptManager.RegisterStartupScript(this, this.GetType(), "tab", "$('.nav-tabs a[href=\"#massimport\"]').tab('show')", true); } } else { showMessage("error", "select file plz"); ScriptManager.RegisterStartupScript(this, this.GetType(), "tab", "$('.nav-tabs a[href=\"#massimport\"]').tab('show')", true); } } public void showMessage(string title, string content) { ClientScript.RegisterStartupScript(this.GetType(), "myalert", "alert('" + content + "');", true); } protected void Button1_Click(object sender, EventArgs e) { importfile(); } } 继承的类作为数据源

NSObject

•在视图控制器内声明中的数据源数组

@objcMembers
class Stock : NSObject {
    dynamic var symbol : String
    dynamic var price : Double
    dynamic var procent : Double
    dynamic var volume : Int

    init(symbol : String, price : Double, procent : Double, volume : Int) {
        self.symbol = symbol
        self.price = price
        self.procent = procent
        self.volume = volume
    }
}

•在@objc var stocks = [Stock]() 中创建一个新的additem项目，而不是重新加载表格视图，仅插入带有智能动画的行

Stock

•@IBAction func additem(_ sender: Any) { if !input.stringValue.isEmpty { let stock = StockInformation(symbol: input.stringValue) stock.GetStockInformation { let newStock = Stock(symbol: stock.Symbol, price: stock.Price, procent: stock.Percent, volume: stock.Volume) let insertionIndex = IndexSet(integer: stocks.count) self.stocks.append(newStock) self.tableView.insertRows(at: insertionIndex, withAnimation: .effectGap) self.input.stringValue = "" } } } 和objectValueFor分别仅是一行

numberOfRows

•func numberOfRows(in tableView: NSTableView) -> Int{ return stocks.count } func tableView(_ tableView: NSTableView, objectValueFor tableColumn: NSTableColumn?, row: Int) -> Any? { return stocks[row] } 操作是

delete

•在Interface Builder中，将数据源和表视图的委托连接到视图控制器。进一步按⌥⌘7（绑定检查器），然后选择每个public func tableView(_ tableView: NSTableView, rowActionsForRow row: Int, edge: NSTableView.RowActionEdge) -> [NSTableViewRowAction] { print("swipe") // left swipe if edge == .trailing { let deleteAction = NSTableViewRowAction(style: .destructive, title: "Delete", handler: { (rowAction, row) in // action code self.stocks.remove(at: row) tableView.removeRows(at: IndexSet(integer: row), withAnimation: .effectFade) }) deleteAction.backgroundColor = NSColor.red return [deleteAction] } } （Table View Cell 不 NSTextField和 not NSTextFieldCell！并将Table Cell View绑定到Value，并将Table Cell View绑定到相应的属性（Model Key Path，objectValue.symbol等）

通过将表视图的objectValue.price绑定到Cocoa Bindings数组，甚至可以使用更多content。然后您可以摆脱数据源及其方法。