How can I reuse a UIView and methods - DRY code in iOS - objective-c

Question

I have 2 methods that add the Previous, Next & Done toolbar above the iOS Keyboard and handle these actions. I'm looking for a way to code these methods once and reuse it across multiple UITableViewControllers. (DRY Code)
I find myself copy and pasting these methods into each UITableViewController. If I make a small change, I have to copy and pastes that change everywhere. The code below is just an example, I seem to be repeating myself a lot in my code.
Here's an example of the code I'd like to reuse:
- (void) createInputAccessoryView
{
_inputAccView = [[UIView alloc] initWithFrame:CGRectMake(10,0,310,42)];
UIToolbar *keyboardToolbar = [[UIToolbar alloc] init];
keyboardToolbar.barStyle = UIBarStyleBlackTranslucent;
[keyboardToolbar sizeToFit];
_segmentedControl = [[UISegmentedControl alloc] initWithItems:[NSArray arrayWithObjects:#"Previous", #"Next", nil]];
[_segmentedControl setSegmentedControlStyle:UISegmentedControlStyleBar];
[_segmentedControl addTarget:self action:#selector(nextPrevious:) forControlEvents:UIControlEventValueChanged];
UIBarButtonItem *nextPrevButton = [[UIBarButtonItem alloc] initWithCustomView:_segmentedControl];
UIBarButtonItem *flexSpace = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:self action:nil];
UIBarButtonItem *doneBtn = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemDone target:self action:#selector(resignKeyboard)];
NSArray *barItems = [NSArray arrayWithObjects:nextPrevButton, flexSpace, doneBtn, nil];
[keyboardToolbar setItems:barItems];
[_inputAccView addSubview:keyboardToolbar];
}
- (void) nextPrevious:(id) sender
{
switch(_activeTxtField.tag) {
case 1:
//Recipe Name
if (_segmentedControl.selectedSegmentIndex == 1){
[_descriptionTextField becomeFirstResponder];
_activeTxtField = _descriptionTextField;
}
break;
case 2:
//Recipe Description
if (_segmentedControl.selectedSegmentIndex == 0){
[_nameTextField becomeFirstResponder];
_activeTxtField = _nameTextField;
}
default:
break;
}
}

Answer 1

Create a custom UIView that defines the common input accessory view. Should include a definition of a delegate to allow the class using the accessory view to handle, for example, previous/next button taps as appropriate. Here's a header file example for a keyboard accessory view:
#import <UIKit/UIKit.h>
#class KeyboardAccessoryView;
#protocol KeyboardAccessoryViewDelegate <NSObject>
-(void)accessoryNext:(id)sender;
-(void)accessoryPrevious:(id)sender;
#end
#interface InputAccessoryView : UIView
#property (nonatomic, weak) id<KeyboardAccessoryViewDelegate> delegate;
#property (nonatomic, setter = enablePrevious:) BOOL previousEnabled;
#property (nonatomic, setter = enableNext:) BOOL nextEnabled;
-(id)initPreviousNextAccessory;
#end
Edit - showing details of use in a UIViewController.
The .h file:
#import <UIKit/UIKit.h>
#import "KeyboardAccessoryView.h"
#interface MyViewController : UIViewController <KeyboardAccessoryViewDelegate>
//...
#end
The .m file:
#import "MyViewController.h"
#interface MyViewController () {
KeyboardAccessoryView *inputAccessoryView;
}
#end
#implementation MyViewController
//...
-(void)viewWillAppear:(BOOL)animated{
[super viewWillAppear:animated];
inputAccessoryView = [[KeyboardAccessoryView alloc] initPreviousNextAccessory];
inputAccessoryView.delegate = self;
//...
}
-(void)accessoryNext:(id)sender{
// handle Next
}
-(void)accessoryPrevious:(id)sender{
// handle Previous
}
//...
#end