How to enable a button in different cases in swift?

Question

I want to disable, and enable a button in different cases:

If the user comes to my share viewController the button will be disabled:

func handleShareAndAbortButton() {
    shareButton.isEnabled = false
    abortButton.isEnabled = false

    let attributedShareButtonText = NSAttributedString(string: shareButton.currentTitle!, attributes: [NSAttributedString.Key.foregroundColor: UIColor(red: 0, green: 0, blue: 0, alpha: 0.2) ])
    let attributedabortButtonText = NSAttributedString(string: abortButton.currentTitle!, attributes: [NSAttributedString.Key.foregroundColor: UIColor(red: 0, green: 0, blue: 0, alpha: 0.2) ])
    shareButton.setAttributedTitle(attributedShareButtonText, for: .normal)
    abortButton.setAttributedTitle(attributedabortButtonText, for: .normal)
}

The handleShareAndAbortButton will be called in viewDidLoad

If something changed (picture or text) I want to enable the button:

func imageDidChange() {
    selectedText = postTextView.text!

    let isText = selectedText
    let isImage = selectedImage != nil

    if isImage || isText != "Schreibe etwas..." && isText != nil {
    shareButton.isEnabled = true
    abortButton.isEnabled = true

    let attributedShareButtonText = NSAttributedString(string: shareButton.currentTitle!, attributes: [NSAttributedString.Key.foregroundColor: UIColor(red: 255, green: 255, blue: 255, alpha: 1.0) ])
    let attributedabortButtonText = NSAttributedString(string: abortButton.currentTitle!, attributes: [NSAttributedString.Key.foregroundColor: UIColor(red: 0, green: 0, blue: 0, alpha: 1.0) ])
    shareButton.setAttributedTitle(attributedShareButtonText, for: .normal)
    abortButton.setAttributedTitle(attributedabortButtonText, for: .normal)
    }
}

I call the imageDidChange in viewWillAppear

Here I delete the placeholder after begin editing:

   extension ShareViewController: UITextViewDelegate {

    func textViewDidBeginEditing(_ textView: UITextView) {
        if postTextView.textColor == UIColor.lightGray {
            postTextView.text = nil
            postTextView.textColor = UIColor.black
        }
    }

    func textViewDidEndEditing(_ textView: UITextView) {
        if postTextView.text.isEmpty {
            postTextView.text = "Schreibe etwas..."
            postTextView.textColor = UIColor.lightGray
        }
    }
}

When the user now enter some text, the placeholder "Schreibe etwas..." will be gone and the text will be also != nil. But its not working.

Update

I found out the problem. When I delete the isText != "Schreibe etwas..." it works. But I need this. How can I compare to a String? If I don't have this code, the user is able to upload always with placeholder text.

Thanks in advance for your help!

Answer 1

You never call imageDidChange after you changed the text.

Use:

func textViewDidEndEditing(_ textView: UITextView) {
     if postTextView.text.isEmpty {
         postTextView.text = "Schreibe etwas..."
         postTextView.textColor = UIColor.lightGray
     }

     imageDidChange()
}