swift - 如何将值从NSViewController传递到NSPopover的自定义NSView？

通过使用委托协议，我尝试将一个字符串（inputFromUser.string）从NSViewController-mainController传递给nspoover-lisadmapview的NSView的自定义子类drawRect函数，请参见下面的代码。但是，没用。我不知道错在哪里。也许还有别的方法可以传递这个字符串。
更新
文件1。

  protocol PlasmidMapDelegate {
    func giveDataForPLasmidMap(dna: String)
  }

  class MainController: NSViewController {

    @IBOutlet var inputFromUser: NSTextView!
    var delegate: plasmidMapDelegate?

    @IBAction func actionPopoverPlasmidMap(sender: AnyObject) {
         popoverPlasmidMap.showRelativeToRect(sender.bounds,
             ofView: sender as! NSView, preferredEdge: NSRectEdge.MinY)

         let dna = inputDnaFromUser.string
         delegate?.giveDataForPLasmidMap(dna!)
    }
}

文件2

class PlasmidMapView: NSView, PlasmidMapDelegate {

    var dnaForMap = String()

    func giveDataForPLasmidMap(dna: String) {
        dnaForMap = dna
    }

    override func drawRect(dirtyRect: NSRect) {

    let objectOfMainController = MainController()
    objectOfMainController.delegate = self

        //here I have checked if the string dnaForMap is passed
         let lengthOfString = CGFloat(dnaForMap.characters.count / 10)

         let pathRect = NSInsetRect(self.bounds, 10, 45)
         let path = NSBezierPath(roundedRect: pathRect,
             xRadius: 5, yRadius: 5)
         path.lineWidth = lengthOfString //the thickness of the line should vary in dependence on the number of typed letter in the NSTextView window - inputDnaFromUser
         NSColor.lightGrayColor().setStroke()
         path.stroke()
    }
 }

最佳答案

好吧，有一些架构错误。您根本不需要委托方法和协议。您只需要定义良好的setter方法：
把你的PlasmidMapView放入NSViewController子类。此视图控制器必须设置为contentViewController-控件的属性。不要忘记在NSPopover-方法或其他方法中按需要设置它。

class PlasmidMapController : NSViewController {
    weak var mapView: PlacmidMapView!
}

二。在您的viewDidLoad中，不要忘记调用PlacmidMapView-method onneedsDisplay设置：

class PlasmidMapView: NSView {
    //...
    var dnaForMap = String() {
        didSet {
            needsDisplay()
        }
    //...
}

III.根据需要从dna-类中设置dna-string。

@IBAction func actionPopoverPlasmidMap(sender: AnyObject) {
     popoverPlasmidMap.showRelativeToRect(sender.bounds,
         ofView: sender as! NSView, preferredEdge: NSRectEdge.MinY)

     let dna = inputDnaFromUser.string
     if let controller = popoverPlasmidMap.contentViewController as? PlasmidMapController {
         controller.mapView.dna = dna
     } else {
         fatalError("Invalid popover content view controller")
     }
}

关于swift - 如何将值从NSViewController传递到NSPopover的自定义NSView？，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/37204073/