Tutorial by Examples

If you want to perform a user input validation of your textfield use the following code snippet: // MARK: - UITextFieldDelegate let allowedCharacters = CharacterSet(charactersIn:"0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvxyz").inverted func textField(_ textField:...

The text field calls different delegate methods (only if delegates are set)One of delegate method called by textfield is *- (BOOL)textFieldShouldReturn:(UITextField )textField This method is called whenever users taps the return button.By using this method, we can implement any custom behaviour. ...

For Swift 3.1: In the first example one can see how you would intercept the user interacting with a textfield while writing. Similarly, there are methods in the UITextFieldDelegate that are called when a user has started and ended his interaction with a TextField. To be able to access these method...