Resize a UITextField while typing (by using Autolayout)

Question

I have a UITableViewCell which has two UITextFields (without borders). The following constraints are used to set up the horizontal layout.

@\"|-10-[leftTextFi

Answer 1

I don't know why UITextField only updates its intrinsicContentSize when it resigns its first responder status. This happens for both iOS 7 and iOS 8.

As a temporary solution, I override intrinsicContentSize and determine the size using typingAttributes. This accounts for leftView and rightView as well

// This method is target-action for UIControlEventEditingChanged
func textFieldEditingChanged(textField: UITextField) {
  textField.invalidateIntrinsicContentSize()
}


override var intrinsicContentSize: CGSize {
    if isEditing {
      let string = (text ?? "") as NSString
      let size = string.size(attributes: typingAttributes)
      return CGSize(width: size.width + (rightView?.bounds.size.width ?? 0) + (leftView?.bounds.size.width ?? 0) + 2,
                    height: size.height)
    }

    return super.intrinsicContentSize
  }

Here I make the it wider to account for the caret