What are UITextField delegate methods?

Ans : 

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Managing Editing

func textFieldShouldBeginEditing(UITextField) -> Bool

Asks the delegate if editing should begin in the specified text field.

func textFieldDidBeginEditing(UITextField)

Tells the delegate that editing began in the specified text field.

func textFieldShouldEndEditing(UITextField) -> Bool

Asks the delegate if editing should stop in the specified text field. 

func textFieldDidEndEditing(UITextField, reason: UITextField.DidEndEditingReason)

Tells the delegate that editing stopped for the specified text field.

func textFieldDidEndEditing(UITextField)

Tells the delegate that editing stopped for the specified text field.

enum UITextField.DidEndEditingReason

Constants indicating the reason why editing ended in a text field.

Editing the Text Field’s Text

func textField(UITextField, shouldChangeCharactersIn: NSRange, replacementString: String) -> Bool

Asks the delegate if the specified text should be changed. 

func textFieldShouldClear(UITextField) -> Bool

Asks the delegate if the text field’s current contents should be removed.

func textFieldShouldReturn(UITextField) -> Bool

Asks the delegate if the text field should process the pressing of the return button.

Instance Methods

func textFieldDidChangeSelection(UITextField)