Capitalization in alert text field [only first word] - ios

Question

I am working on a checklist app. If the user wants to add a new point on his checklist, he can push the "Add" button and an alert will appear with a UITextField to put his new task in.
alert.addAction(UIAlertAction(title: "Add", style: .default, handler: { (action) in
let textf = alert.textFields![0] as UITextField
if(textf.text != "")
{
checklist.append(textf.text!.capitalized)
}
self.myTableView.reloadData()
}))
self.present(alert, animated: true, completion: nil)
}
Doing it like this will capitalize the words after hitting "Add". But I want that only the first word to be capitalized. Also, I want it to be on the keyboard when it appears so that the first word is capitalized right away. How can I do that?
let alert = UIAlertController(title: "Add new task", message: nil, preferredStyle: .alert)
alert.addTextField { (alertInputTextField) in
}

Answer 1

Use the autocapitalizationType property of the textfield and set it to sentences when you add it...
alert.addTextField { textField in
textField.text = "Some default text"
textField.autocapitalizationType = .sentences
}
Always refer to the documentation, it explains this quite well.
If you need to do this to a String directly just uppercase the first letter of the String.

Answer 2

You can use any of the below function:-
public mutating func capitalizeFirst() {
guard self.count > 0 else { return }
self.replaceSubrange(startIndex...startIndex, with: String(self[startIndex]).capitalized)
}
or
public func capitalizedFirst() -> String {
guard self.count > 0 else { return self }
var result = self
result.replaceSubrange(startIndex...startIndex, with: String(self[startIndex]).capitalized)
return result
}