ios7backButtonBackground.m

// Fixed iOS 7 backButtonBackground issue.
        // http://stackoverflow.com/questions/18617522/back-button-is-not-visible-in-ios-7/18950658#18950658
        if ([[UIDevice currentDevice].systemVersion compare:@"7.0" options:NSNumericSearch] != NSOrderedAscending) {
            [[UINavigationBar appearance] setTintColor:[UIColor whiteColor]];
            [[UINavigationBar appearance] setBackIndicatorImage:[UIImage imageNamed:@"BackButtonIcon"]];
        } else {
            UIImage *backButtonBackground = [[UIImage imageNamed:@"BackButtonIcon"] resizableImageWithCapInsets:UIEdgeInsetsMake(0, 29, 0, 0)];
            [[UIBarButtonItem appearance] setBackButtonBackgroundImage:backButtonBackground forState:UIControlStateNormal barMetrics:UIBarMetricsDefault];
        }