CODEWITHSUNDEEP
iosswiftuitextviewnsattributedstring
a.wip
a.wip

Reputation: 69

Selecting text and changing attributes bug?

I am having trouble doing a simple text selection and change of attributes. I can't seem to get the program past the first step. It says that the selectedRange is nil. Why is this happening? Is this a bug with something?

func selectText() {
    if let textRange = textView?.selectedRange {
        let attributes = [NSAttributedString.Key.font: UIFont(name: "Arial", size: 18.0)]
        textView.textStorage.addAttributes(attributes as [NSAttributedString.Key : Any], range: textRange)
    }
}

Edit with code from @DionizB (not working)

I call it from another Swift file that holds the view for the KeyboardAccessory. Code in that file is:

class KeyboardAccessory: UIView {
let VC = ViewController()
@IBAction func boldButtonTapped(_ sender: Any) {
    print("boldButtonTapped -> Sending to bold()")
    VC.bold()
    }
}

Code now in main ViewController is:

var selectedRange: NSRange?

func textViewDidChangeSelection(_ textView: UITextView) {
    selectedRange = textView.selectedRange
    print(selectedRange)
}

func bold() {
    print("Starting bold()")
    print(selectedRange)
    if let textRange = selectedRange {
        print(textRange)
        let attributes = [NSAttributedString.Key.font: UIFont.systemFont(ofSize: 17, weight: UIFont.Weight.thin)]
        textView.textStorage.addAttributes(attributes as [NSAttributedString.Key : Any], range: textRange)
    }
}

textViewDidChangeSelection is printing the selectedRange but when bold() is called from the KeyboardAccessory View it prints nil! How I load the AccessoryView.

override func viewDidLoad() {
    super.viewDidLoad()
    textView.inputAccessoryView = Bundle.main.loadNibNamed("KeyboardAccessory", owner: self, options: nil)?.first as! UIView?
}

Upvotes: 1

Views: 206

Answers (1)

DionizB
DionizB

Reputation: 1507

On viewDidLoad() make sure you add textView.delegate = self. Also in your class inherit from UITextViewDelegate.

Then call your selectText() in textViewDidChangeSelection(_:)

func textViewDidChangeSelection(_ textView: UITextView) {
    selectText()
}

And it will work properly.

EDIT Normally it should work even when you call your selectText() inside your button action. But since it's not working, let's do a workaround: Declare var selectedRange: NSRange? in your class.

Then in 

func textViewDidChangeSelection(_ textView: UITextView) {
    selectedRange = textView.selectedRange
}

And in your selectText() do this

func selectText() {
    if let textRange = selectedRange {
        let attributes = [NSAttributedString.Key.font: UIFont(name: "Arial", size: 18.0)]
        textView.textStorage.addAttributes(attributes as [NSAttributedString.Key : Any], range: textRange)
    }
}

EDIT for AccessoryView

Update your KeyboardAccessory:

class KeyboardAccessory: UIView {
    var boldAction: (() -> Void)? // This is a closure, give it a read after making your button work
    @IBAction func boldButtonTapped(_ sender: Any) {
        print("boldButtonTapped -> Sending to bold()")
        boldAction?()
    }
}

Try to cast your loaded nib as KeyboardAccessory and access your action like this:

override func viewDidLoad() {
    super.viewDidLoad()
    var keyboardAccessory = Bundle.main.loadNibNamed("KeyboardAccessory", owner: self, options: nil)?.first as! KeyboardAccessory?
    keyboardAccessory.boldAction = { [weak self] in // to avoid retain cycles, read also about these
        self?.selectText()
    }
    textView.inputAccessoryView = keyboardAccessory
}

Upvotes: 1

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