[ios] How do I change the title of the "back" button on a Navigation Bar

Most of solutions kills the original style of BackButton (The left arrowed bar button) while adding a usual button with desired title.
So to keep the original style there are 2 ways:
1st: To use undocumented button style (110 or something like that) which I prefer not to do. But if you want you could find how to do it here, on stackoverflow.
2nd: To use I the Trenskow's idea. I liked it and I use it a bit changed.
Instead of overriding - (NSString*)title I've decided to keep the original title in the following way (which allows me to use nib's titles as well as given title at push state btw).

- (void)viewDidLoad {
    [super viewDidLoad];
    static NSString * backButtonTitle=@"Back"; //or whatever u want

    if (![self.title isEqualToString:backButtonTitle]){

        UILabel* customTitleView = [[UILabel alloc] initWithFrame:CGRectZero];
        customTitleView.text = self.title; // original title
        customTitleView.font = [UIFont boldSystemFontOfSize:20];
        customTitleView.backgroundColor = [UIColor clearColor];
        customTitleView.textColor = [UIColor whiteColor];
        customTitleView.shadowColor = [UIColor colorWithRed:0.0 green:0.0 blue:0.0 alpha:0.5];
        customTitleView.shadowOffset = CGSizeMake(0, -1);

        [customTitleView sizeToFit];

        self.navigationItem.titleView = [customTitleView autorelease];
        self.title = backButtonTitle; 
    }
}

This solution works good and it looks native. Also if use it in the viewDidLoad method it prevents execution more then 1 time.
Also I've tried a Jessedc's solution but it looks bad. It causes visible to user title bar change on the fly from original to BackButton's desired and back.

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