Set the navigation bar topic in IOS development and the navigation bar topic in ios development

Set the navigation bar topic in IOS development and the navigation bar topic in ios development

/*** The system calls this class for the first time (only one class is called once) */+ (void) initialize {// set the navigation bar topic UINavigationBar * navBar = [UINavigationBar appearance]; // set the background image NSString * bgName = nil; if (iOS7) {// iOS 7.0 bgName = @ "NavBar64";} else {// non-iOS7 bgName = @ "NavBar";} [navBar setBackgroundImage: [UIImage imageNamed: bgName] forBarMetrics: UIBarMetricsDefault]; // set the title text color NSMutableDictionary * attrs = [NSMutableDictionary dic Tionary]; attrs [NSForegroundColorAttributeName] = [UIColor whiteColor]; attrs [NSFontAttributeName] = [UIFont systemFontOfSize: 16]; [navBar setTitleTextAttributes: attrs]; // set the topic UIBarButtonItem * item = [UIBarButtonItem appearance]; // set the text color to optional * itemAttrs = [invalid dictionary]; itemAttrs [character] = [UIFont systemFontOfSize: 14]; itemAttrs [NSForeground ColorAttributeName] = [UIColor whiteColor]; [item setTitleTextAttributes: itemAttrs forState: UIControlStateNormal]; if (! IOS7) {// set the button background [item setBackgroundImage: [UIImage imageNamed: @ "NavButton"] forState: UIControlStateNormal barMetrics: UIBarMetricsDefault]; [item attributes: [UIImage imageNamed: @ "NavButtonPressed"] forState: Alert barMetrics: UIBarMetricsDefault]; // set the background of the return button [item Background: [UIImage imageNamed: @ "NavButton"] forState: UIControlStateNormal barMetrics: UIBarMetricsDefault]; [item representation: [UIImage imageNamed: @ "NavButtonPressed"] forState: UIControlStateHighlighted barMetrics: UIBarMetricsDefault];} else {navBar. tintColor = [UIColor whiteColor] ;}}