不使用NSView (_ updateRect: NSRect)函数直接在绘图中绘制

import Cocoa

class MyCustomView: NSView {
    override func drawRect(dirtyRect: NSRect) {
        super.drawRect(dirtyRect)
        
        // 使用Core Graphics绘制一个矩形
        let context = NSGraphicsContext.currentContext()?.CGContext
        CGContextSetFillColorWithColor(context, NSColor.redColor().CGColor)
        CGContextFillRect(context, dirtyRect)
        
        // 使用Core Graphics绘制一个圆形
        let centerX = dirtyRect.origin.x + dirtyRect.size.width / 2
        let centerY = dirtyRect.origin.y + dirtyRect.size.height / 2
        let radius = min(dirtyRect.size.width, dirtyRect.size.height) / 2
        CGContextSetFillColorWithColor(context, NSColor.blueColor().CGColor)
        CGContextFillEllipseInRect(context, CGRectMake(centerX - radius, centerY - radius, radius * 2, radius * 2))
        
        // 使用Core Graphics绘制文本
        let text = "Hello, World!"
        let attributes = [NSFontAttributeName: NSFont.systemFontOfSize(20), NSForegroundColorAttributeName: NSColor.whiteColor()]
        let textSize = text.sizeWithAttributes(attributes)
        let textRect = CGRectMake(centerX - textSize.width / 2, centerY - textSize.height / 2, textSize.width, textSize.height)
        text.drawInRect(textRect, withAttributes: attributes)
    }
}

// 在需要使用自定义视图的地方，将其添加到父视图中
let customView = MyCustomView(frame: NSRect(x: 0, y: 0, width: 200, height: 200))
parentView.addSubview(customView)