macos – NSTextField不断重复标题

我用 Swift创建了一个新的OSX应用程序.从视图开始,在表视图中拖动到视图中.然后我按住Ctrl键并从我的表视图中拖动,将AppDelegate添加为我的dataSource和delegate.最后,按住Ctrl并单击并从AppDelegate拖动,为myTableView创建一个IBOutlet到表视图.

为什么会这样？使用XCode版本6.1(6A1027).

构建以下结果：

import Cocoa    
class AppDelegate: NSObject,NSApplicationDelegate,NSTableViewDataSource,NSTableViewDelegate {

    @IBOutlet weak var window: NSWindow!
    @IBOutlet weak var myTableView: NSTableView!

    func applicationDidFinishLaunching(aNotification: NSNotification?) {
    }

    func numberOfRowsInTableView(aTableView: NSTableView!) -> Int
    {
        let numberOfRows:Int = getDataArray().count
        return numberOfRows
    }

    func tableView(tableView: NSTableView!,objectValueForTableColumn tableColumn: NSTableColumn!,row rowIndex: Int) -> AnyObject!
    {
        var newString: (AnyObject?) = getDataArray().objectAtIndex(rowIndex).objectForKey(tableColumn.identifier)
        println(newString!)
        return newString!
    }

    func applicationWillTerminate(aNotification: NSNotification?) {
        // Insert code here to tear down your application
    }

    func getDataArray () -> NSArray{
        var dataArray:[NSDictionary] = [["FirstName": "Debasis","LastName": "Das"],["FirstName": "Nishant","LastName": "Singh"],["FirstName": "John","LastName": "Doe"],["FirstName": "Jane",["FirstName": "Mary","LastName": "Jane"]];
        //println(dataArray);
        return dataArray;
    }

}