如何将自定义 NSTextStorage 设置为从 storyboard 创建的 UITextView object？

Question

I want to set a custom NSTextStorage to a UITextView object created from a storyboard. If it's really needed I can consider subclassing of UITextView .

(I know if I created a UITextView object from the code I would be able to use a init(frame: CGRect, textContainer: NSTextContainer?) constructor.)

Swift is preferable.

Answer 1

I was able to accomplish this by adding a UITextView subview to a UIView wrapper subclass that is instantiated from the storyboard. You can then add a getter on the view controller that returns the box's textView instance, so that you can assign yourself as the delegate, access properties etc...

Something like

class ViewController: UIViewController, UITextViewDelegate {

    @IBOutlet private weak var textViewBox: TextViewBox! // connected in storyboard

    var textView: UITextView! {
        return textViewBox?.textView
    }

    override func viewDidLoad() {
        super.viewDidLoad()

        textView?.delegate = self
    }
}

Answer 2

it works for me:

  final class SendTextViewController: BaseViewController {
        @IBOutlet private var textView: UITextView!
        private var textStorage = MentionTextStorage()

    override func viewDidLoad() {
       super.viewDidLoad()
       textView.textStorage.removeLayoutManager(textView.layoutManager)
       textStorage.addLayoutManager(textView.layoutManager)
    }
}