How to use sizeThatFits in Swift?

Question

I have got a text view and a view like this

let lb = UITextView()
let view = UIView()
background_img_view.addSubview(about_txt)

lb doesn't have fixed height,it can be 30 or 300px,how can i use sizeThatFits to make background_img_view's height depend on lb's?

Answer 1

Try this:

// Get the width you want to fit
let fixedWidth = textView.frame.size.width

// Calculate the biggest size that fits in the given CGSize
let newSize = textView.sizeThatFits(CGSize(width: fixedWidth, height: CGFloat.greatestFiniteMagnitude))

// Set the textView's size to be whatever is bigger: The fitted width or the fixedWidth
textView.frame.size = CGSize(width: max(newSize.width, fixedWidth), height: newSize.height)

// Make the "background_img_view" height match the textView's height
background_img_view.frame.size.height = textView.frame.size.height