Place view overlap another, get view dimension

We want to put a view on top of another view, a label on top of an imageView. Simply put it in to view after imageView. A view addSubview before will be show at background.

Sometime we want to draw a view below another view, but we don’t know it’s height, for example, it is a label with numberlines=0. We need to get it height.

let height = label.frame.size.height

Width dimension get like this

let width = label.frame.size.width