如何在Xcode 7和Swift 2中创建一个圆角矩形标签

I am working in Xcode 7 beta 3. I want to create a label with a rounded rectangle background. By default, I can create a background with my color of choice but I can't round the corners. I have tried creating an outlet for that label and then in I am working in Xcode 7 beta 3. I want to creat