包含NSStackView的NSScrollView.为什么NSStackView项从下到上? [英] NSScrollView containing NSStackView. Why the NSStackView items from bottom to Top?

问题描述

包含NSStackView的NSScrollView. NSStackView的项目将在运行时添加.新的NSStackView的项目从下至上，但我希望它们从上至下.

The NSScrollView containing a NSStackView. The NSStackView's items will add in runtime.The new NSStackView's items are from bottom to top, but I want they are from top to bottom.

main.storyboard

The main.storyboard

ViewController

The ViewController

import Cocoa

class ViewController: NSViewController {

    var todoList:[Todo] = []

    @IBOutlet weak var todosStackView: NSStackView!
    @IBOutlet weak var todosScrollView: NSScrollView!

    @IBAction func onEnter(sender: NSTextField) {
        let todo = Todo()
        todo.content = sender.stringValue
        self.todoList.append(todo)

        let todoItemView = TodoItem()
        todoItemView.setButtonType(.SwitchButton)
        todoItemView.todo=todo
        todosStackView.addView(todoItemView, inGravity: .Top)
    }

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view.
    }

    override var representedObject: AnyObject? {
        didSet {
        // Update the view, if already loaded.
        }
    }
}

复选框按钮类

import Cocoa

class TodoItem: NSButton {
    var todo:Todo!{
        didSet {
            self.title = self.todo.content
            self.state = self.todo.done ? NSOnState : NSOffState
        }
    }

    func completeTodo(){
        if(self.state == NSOnState){
            self.todo.done = true
        }else{
            self.todo.done = false
        }
    }

    required init?(coder: NSCoder) {
        super.init(coder: coder)
    }

    override init(frame frameRect: NSRect) {
        super.init(frame: frameRect)
        self.setButtonType(.SwitchButton)
        self.target = self
        self.action = #selector(self.completeTodo)
    }
}

推荐答案

默认情况下，NSClipViews(和基本NSView)不会翻转，因此坐标(和滚动视图的位置)相对于左下角.

By default, NSClipViews (and the base NSView) are not flipped and so coordinates (and scroll view positioning) are relative to the bottom left.

您可以继承NSClipView的子类并覆盖isFlipped以返回true.然后在IB中，将滚动视图的剪辑视图设置为该自定义类.

You can subclass NSClipView and override isFlipped to return true. Then in IB, set the clip view of the scroll view to that custom class.

这篇关于包含NSStackView的NSScrollView.为什么NSStackView项从下到上?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！