水平和垂直嵌套滚动视图

Question

我的视图包含一个水平滚动滚动视图，其中包含多个垂直滚动表视图。

参见图：

然而，表视图是在滚动视图阻断水平滚动时光标在它们。

我该如何让滚动传递给超级视图？

---

代码应用

@NSApplicationMain 
class AppDelegate: NSObject, NSApplicationDelegate { 

    @IBOutlet weak var window: NSWindow! 
    var viewController: ViewController! 

    func applicationDidFinishLaunching(aNotification: NSNotification) { 
     viewController = ViewController(nibName: "ViewController", bundle: nil) 
     viewController.view.translatesAutoresizingMaskIntoConstraints = false 
     window.contentView!.addSubview(viewController.view) 
     //... 
    } 
    //... 
} 

视图控制器

class ViewController: NSViewController { 

    @IBOutlet weak var scrollView: NSScrollView! 
    //... 

    func addListView(listPath: String) { 
     let listView = ListViewController(nibName: "ListView", bundle: nil) 
     listView!.listPath = listPath 

     listView!.view.translatesAutoresizingMaskIntoConstraints = false 
     scrollView.contentView.addSubview(listView!.view) 
     //... 
    } 
    //... 
} 

列表视图

class ListViewController: NSViewController { 

    @IBOutlet weak var itemsTitleView: NSTextField! 
    @IBOutlet weak var itemsTableView: MyTableView! 
    //... 
} 

的TableView

class MyTableView: NSTableView { 

    override func drawRect(dirtyRect: NSRect) { 
     super.drawRect(dirtyRect) 

     // Drawing code here. 
    } 

    var mainScrollView: NSScrollView? { 
     let app = NSApplication.sharedApplication() 
     let delegate = app.delegate as! AppDelegate 
     return delegate.viewController.scrollView 
} 

    override func mouseDown(theEvent: NSEvent) { 
     // do nothing 
    } 

    override func scrollWheel(theEvent: NSEvent) { 
     if theEvent.scrollingDeltaY == 0 { 
      // It's a horizontal scroll -> redirect it 
      if let tableScrollView = enclosingScrollView, mainScrollView = mainScrollView { 
       mainScrollView.scrollWheel(theEvent) 
      } 
     } else { 
      // It's a vertical scroll -> behave normally 
      super.scrollWheel(theEvent) 
     } 
    } 

} 

Answer 1

我会尝试的第一件事就是捕捉滚动事件，因为它传递到表视图。确定事件对象表示水平滚动手势后，将其重定向到主滚动视图。

class MyTableView: NSTableView { 

    var mainScrollView: NSScrollView? { 
     // Your tables will need some way to access the main scroll view. 
     // I'm assuming here that there's a reference to it on the AppDelegate 
     let app = NSApplication.sharedApplication() 
     let delegate = app.delegate as! AppDelegate 
     return delegate.mainScrollView 
    } 


    override func scrollWheel(theEvent: NSEvent) { 

     if theEvent.scrollingDeltaY == 0 { 
      // It's a horizontal scroll -> redirect it 
      if let tableScrollView = enclosingScrollView, mainScrollView = self.mainScrollView { 
       mainScrollView.scrollWheel(theEvent) 
      } 
     } else { 
      // It's a vertical scroll -> behave normally 
      super.scrollWheel(theEvent) 
     } 
    } 
} 

但是我不得不说，任何时候当你开始搞这样的事情时，你需要为副作用做好准备;在我为测试此代码而创建的简单演示应用程序中，它似乎可以正常工作，但如果此方法带来更多挑战，请不要感到惊讶。