在Swift OS X应用程序中点击按钮时改变自定义视图。

So in my Swift OS X app I have one custom view and one button. When I start my app, my view shows a red oval and I need to change that drawing to drawRectangle()-method when i click my button.

在我的Swift OS X应用中，我有一个自定义视图和一个按钮。当我启动应用程序时，我的视图会显示一个红色的椭圆，当我点击按钮时，我需要将绘图更改为drawrectang()方法。

My custom view's class MyView looks like following:

我的自定义视图的类MyView如下所示:

import Cocoa
import AppKit

class MyView: NSView {

    var isTrue = true

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

        // Drawing code here.
        if isTrue {
            DrawingMethods.drawOval()
        } else {
            DrawingMethods.drawRectangle()
        }

    }

    @IBAction func buttonPressed(sender: AnyObject) {

        isTrue = false
        // Now I need to update the view, so it draws rectangle isntead of oval. How I do that?

    }
}

And I have my DrawingMethods class:

我有我的DrawingMethods类:

import Cocoa

public class DrawingMethods: NSObject {

    public class func drawOval() {

        let color = NSColor(calibratedRed: 1, green: 0, blue: 0, alpha: 1)
        let ovalPath = NSBezierPath(ovalInRect: NSMakeRect(64, 54, 50, 45))
        color.setFill()
        ovalPath.fill()
    }

    public class func drawRectangle() {

        let color = NSColor(calibratedRed: 1, green: 0, blue: 0, alpha: 1)
        let rectanglePath = NSBezierPath(rect: NSMakeRect(136, 12, 34, 34))
        color.setFill()
        rectanglePath.fill()
    }
}

So how can i get my custom views draw rectangle instead of oval?

那么如何让我的自定义视图绘制矩形而不是椭圆呢?

1 个解决方案

#1

Call setNeedsDisplayInRect() on the view after setting isTrue = false. This will notify the view that it needs to redraw and drawRect will be called again.

设置isTrue = false后，在视图上调用setNeedsDisplayInRect()。这将通知视图需要重新绘制，并再次调用drawRect。

Your buttonPressed function should be defined in the ViewController that contains the custom view

你的buttonPressed函数应该在包含自定义视图的ViewController中定义

import Cocoa

class ViewController: NSViewController {
    @IBOutlet customView: MyView!

    override func viewDidLoad() {
        super.viewDidLoad()

        // Do any additional setup after loading the view.
    }

    @IBAction func buttonPressed(sender: AnyObject) {
        customView.isTrue = false
        customView.setNeedsDisplayInRect(customView.bounds)
    }
}

Alternatively, you can just set the needsDisplay property of the view to true to redraw the entire view:

或者，您可以将视图的需要显示属性设置为true，以重新绘制整个视图:

customView.needsDisplay = true

#1