话不多说，直接上代码：

func imageLayer(x:CGFloat,y:CGFloat,width:CGFloat,height:CGFloat) {

        self.customView = self.msgItem.view // 图片imageView

        self.customView.frame = CGRect(x: x + self.msgItem.insets.left, y: y + self.msgItem.insets.top, width: width, height: height)

        self.addSubview(self.customView)

        self.bubbleImage.frame = self.customView.frame// 设置气泡image frame 为图片image frame

        self.bubbleImage.image = UIImage(named:meBubbleStr)!.stretchableImage(withLeftCapWidth: 15, topCapHeight:15)

        let layer = self.bubbleImage.layer// 获取气泡image layer

        layer.frame = CGRect.init(origin: CGPoint.zero, size: self.bubbleImage.layer.frame.size)

        self.customView.layer.mask = layer

    }

 

文字发送时：聊天气泡拉伸

func setBubbleImage(imageName:String,withCapInsets:UIEdgeInsets,x:CGFloat,y:CGFloat,width:CGFloat,height:CGFloat)  {

        var image = UIImage.init(named: imageName)// 图片气泡

        image = image?.resizableImage(withCapInsets: withCapInsets)// 设置拉伸四周边界

        self.bubbleImage.image = image

        self.bubbleImage.frame = CGRect(x: x, y: y, width: width + self.msgItem.insets.left + self.msgItem.insets.right, height: height + self.msgItem.insets.top + self.msgItem.insets.bottom)

        self.addSubview(self.bubbleImage)

    }