Having trouble getting UIView sizeToFit to do anything meaningful

Question

When I add a subview to a UIView, or when I resize an existing subview, I would expect [view sizeToFit] and [view sizeThatFits] to ref

Answer 1

If you won't override UIView, u can just use extension.

Swift:

extension UIView {

    func sizeToFitCustom () {
        var size = CGSize(width: 0, height: 0)
        for view in self.subviews {
            let frame = view.frame
            let newW = frame.origin.x + frame.width
            let newH = frame.origin.y + frame.height
            if newW > size.width {
                size.width = newW
            }
            if newH > size.height {
                size.height = newH
            }
        }
        self.frame.size = size
    }

}

The same code but 3 times faster:

extension UIView {
    final func sizeToFitCustom() {
        var w: CGFloat = 0,
            h: CGFloat = 0
        for view in subviews {
            if view.frame.origin.x + view.frame.width > w { w = view.frame.origin.x + view.frame.width }
            if view.frame.origin.y + view.frame.height > h { h = view.frame.origin.y + view.frame.height }
        }
        frame.size = CGSize(width: w, height: h)
    }
}