pod 'MZDrawBoardView', '~> 0.0.2'

let drawBorad = MZDrawBoardView(frame: CGRect(x: 0, y: 100, width: self.view.bounds.width, height: 200))
drawBorad.backgroundColor = .gray
// 设置画板画笔颜色
drawBorad.lineColor = .black
// 设置画板画笔粗细
drawBorad.lineWidth = 4
self.view.addSubview(drawBorad)

// 清空画板内容
drawBorad.clear()

// 回退
drawBorad.back()

// 画板内容生成图片
let image = drawBorad.getImage()