SwiftでViewをaddとremove
//remove self.readCanvas?.removeFromSuperview() self.drawCanvas?.removeFromSuperview() //ReadCanvas self.readCanvas = UIView(frame:self.canvasFrame); self.readCanvas.backgroundColor = UIColor.clearColor() self.baseUiView.addSubview(self.readCanvas); //DrawCanvas self.drawCanvas = UIView(frame:self.canvasFrame); self.drawCanvas.backgroundColor = UIColor.clearColor() self.baseUiView.addSubview(self.drawCanvas);