如何使用Mac OS X Cocoa事件进行多点触控手势

import Cocoa
import CoreGraphics

class MultiTouchView: NSView {
    override func touchesBegan(with event: NSEvent) {
        // 处理触摸开始事件
    }

    override func touchesMoved(with event: NSEvent) {
        // 处理触摸移动事件
    }

    override func touchesEnded(with event: NSEvent) {
        // 处理触摸结束事件
    }
}

var touches = [UITouch: CGPoint]()

override func touchesBegan(with event: NSEvent) {
    for touch in event.touches(for: self) {
        let location = touch.location(in: self)
        touches[touch] = location
    }
}

override func touchesMoved(with event: NSEvent) {
    for touch in event.touches(for: self) {
        let location = touch.location(in: self)
        if let previousLocation = touches[touch] {
            // 处理触摸点的移动
        }
        touches[touch] = location
    }
}

override func touchesEnded(with event: NSEvent) {
    for touch in event.touches(for: self) {
        touches.removeValue(forKey: touch)
    }
}