How to calculate TextView height base on text

Question

I am using the code below for calculate the height of text, then set this height for UILabel and UITextView

CGSize targetSize = CGS         


        

Answer 1

Swift 5

A classic hack I've used to do this is create a function that takes the String as a parameter. Within the function it generates a label with the width required, infinite number of lines, and a height of "too much". Then apply sizeToFit() on the label and return the height of the frame.

func calculatedHeight(for text: String, width: CGFloat) -> CGFloat {
    let label = UILabel(frame: CGRect(x: 0, y: 0, width: width,
                                      height: .greatestFiniteMagnitude))
    label.numberOfLines = 0
    label.text = text
    label.sizeToFit()
    return label.frame.height
}

The returned height can be applied to a UITextField height anchor. Though I do recommend calculating the width dynamically based on screen size, but that's up to you.