簡化iOS的鍵盤處理：KeyboardController

KeyboardController用于簡化iOS的鍵盤處理。

用法：

To use KeyboardController, simply initialize it with an array of UITextField objects.

id textFields = @[_textField1, _textField2, 
                _textField3, _textField4, _textField5];
self.keyboardController = [KeyboardController controllerWithTextFields:textFields];

KeyboardController, depending on a returnKeyType property of an UITextField instance, will:

• UIReturnKeyNext - move to next text field
• UIReturnKeyDone - close keyboard

You can interact with KeyboardController directly via the following methods:

- (void)moveToNextTextField;
- (void)moveToPreviousTextField;
- (void)closeKeyboard;

KeyboardControllerDelegate

You could also take advantage of delegation methods:

- (void)controllerDidHideKeyboard:(KeyboardController *)controller;
- (void)controllerDidShowKeyboard:(KeyboardController *)controller;
- (void)controllerWillHideKeyboard:(KeyboardController *)controller;
- (void)controllerWillShowKeyboard:(KeyboardController *)controller;

by setting a delegate property of a KeyboardController:

self.keyboardController.delegate = self; 

UITextFieldDelegate

There is also an option of setting a textFieldDelegate property of all textFields that are under control of KeyboardController:

self.keyboardController.textFieldDelegate = self; 

This could be particulary useful if you would like to add individual behaviour to UITextFields objects.

- (void)textFieldDidBeginEditing:(UITextField *)textField {
    if (textField == self.textField4) [self _moveViewByY:-50];
    if (textField == self.textField5) [self _moveViewByY:-200];
}

- (void)textFieldDidEndEditing:(UITextField *)textField {
    if (textField == self.textField4) [self _moveViewByY:50];
    if (textField == self.textField5) [self _moveViewByY:200];
}

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