How to specify allowed characters in keyboard?

Question

I want to create a page for pin entry for both, android and iOS platforms. Numeric specification in Keyboard property is close to my needs. I can do something like this to restrict allowed characters and overall length. However I need to get rid of the dot character on the keyboard. How can I achieve that?

Answer 1

You can remove the dot from the soft keyboard.

Using the solution you linked and Keyboard="Numeric", you can use the same TextChanged event that restricts entry text size to restrict the '.'.

Example:

public void OnTextChanged(object sender, TextChangedEventArgs args)
{
    var e = sender as Entry;
    string val = e.Text;

    if (string.IsNullOrEmpty(val))
    {
        return;
    }

    if (MaxLength > 0 && val.Length > MaxLength)
    {
        val = val.Remove(val.Length - 1);
    }

    if (val.Contains("."))
    {
        val.Replace(".", string.Empty);    
    }
    e.Text = val;
}

Other option would be creating a Grid for the PIN. And show the PIN in a Label instead of and Entry to avoid pasting.