How to enable a button in different cases in swift? - 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()
}

Answer 2

I see that you’re using UITextField. You probably want to have just placeholder "Schreibe etwas...". So, in viewDidLoad or in Storyboard set placeholder of your TextField to "Schreibe etwas...". Then you don’t need TextField’s delegate methods for setting text and color of text in delegate methods.
Well, you need it, but not for this. You have to call imageDidChange in textFieldDidEndEditing
Now change declaring isText. You just passed reference for selectedText. Don’t do this, just check if there is text
let isText = !selectedText.isEmpty // don’t forget to !
also rewrite your conditions
if isImage || isText
... you don’t need to check if isText isn’tnil