UIBarButtonItem+GSTBackButtonFactory.h

#import <UIKit/UIKit.h>

@interface UIBarButtonItem (GSTBackButtonFactory)

+ (UIBarButtonItem *)backButtonItemWithTitle:(NSString *)backButtonTitle;

@end

UIBarButtonItem+GSTBackButtonFactory.m

#import "UIBarButtonItem+GSTBackButtonFactory.h"

@implementation UIBarButtonItem (GSTBackButtonFactory)

+ (UIBarButtonItem *)backButtonItemWithTitle:(NSString *)aTitle
{
	static NSMutableDictionary *buttonsCache;
	static dispatch_once_t onceToken;
	dispatch_once(&onceToken, ^{
		buttonsCache = [NSMutableDictionary dictionary];
	});
	
	UIBarButtonItem *backButtonItem = buttonsCache[aTitle];
	if (backButtonItem == nil)
	{
		backButtonItem = buttonsCache[aTitle] =
			[[UIBarButtonItem alloc] initWithTitle: aTitle
			                                 style: UIBarButtonItemStyleBordered
			                                target: nil action: nil];
	}
	
	return backButtonItem;
}

@end