ComponentOne Xamarin.iOS Documentation
Controls / Input / MaskedTextField
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    The C1MaskedTextField control is designed to capture properly formatted user input. The control prevents users from entering invalid values in an input field, and other characters like slash or hyphen. The control also provides data validation by skipping over invalid entries as the user types. The control uses special elements called mask symbols or mask inputs to specify the format in which the data should be entered in an input field, .

    For example, you can use the MaskedTextField control to create an input field that accepts phone numbers with area code only, or Date field that allows users to enter date in dd/mm/yyyy format only.