objective-c - osx desktop program development, cocoa, NSScrllView includes NSStackView problem

Question

I have an NSStackView, and the content is added at runtime. I hope that scroll bars will appear when the content exceeds a certain height, so I set an NSScrollView outside.
Scroll bars can now appear, but there is a new problem. The new content of NSStackView is added from bottom to top.

Please tell me how to add new content from top to bottom.

The following is my main.storyboard

The following is the viewController code

import Cocoa

class ViewController: NSViewController {

    var todoList:[Todo] = []
    
    @IBOutlet weak var todosStackView: NSStackView!
    @IBOutlet weak var todosScrollView: NSScrollView!
    
    @IBAction func onEnter(sender: NSTextField) {
        //创建Todo
        let todo = Todo()
        todo.content = sender.stringValue
        self.todoList.append(todo)
        
        //根据上面的Todo创建一个checkbox
        let todoItemView = TodoItem()
        todoItemView.setButtonType(.SwitchButton)
        todoItemView.todo=todo
        
        //将上面的checkbox加入NSStackView
        todosStackView.addView(todoItemView, inGravity: .Top)
    }
    
    @IBOutlet var todos: NSArrayController!
    override func viewDidLoad() {
        super.viewDidLoad()
        todosScrollView.hasVerticalScroller = true
        todosScrollView.hasHorizontalScroller = true
        // Do any additional setup after loading the view.
    }

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

The following is the checkbox code

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)
    }
}

Answer 1

I asked this question on stackoverflow and it solved my problem.

NSClipView is a subclass of NSView. The default coordinate of NSView is the lower left corner.

So just change isFlipped to true, which means flipping the coordinates from the lower left corner to the upper left corner.

import Cocoa

class FlippedClipView : NSClipView{
    override var flipped:Bool {
        get {
            return true
        }
    }
}

Then change the custom class of ClipView to FlippedClipView in main.storyboard

Original answer

Answer 2

Hello, I am a novice using spring security. I searched your previous question about customizing UserPasswordAthenticationFilter on the Internet. I also encountered the same problem and wanted to write my own authentication. Have you solved it now?