Setting UISearchBar Appearance in AppDelegate Not Working

code:

- (bool)application:(uiapplication *)application didfinishlaunchingwithoptions:(nsdictionary *)launchoptions  {      self.window = [[uiwindow alloc] initwithframe:[[uiscreen mainscreen] bounds]];      // override point customization after application launch.      self.viewcontroller = [[searchviewcontroller alloc] initwithnibname:@"searchviewcontroller" bundle:nil];      self.window.rootviewcontroller = self.viewcontroller;      [self.window makekeyandvisible];      return yes;            uiimage *barimage = [uiimage imagenamed:@"bartexture"];      [[uisearchbar appearance] setbackgroundimage:barimage];  }

my rootviewcontroller has uisearchbar object. why doesn't uisearchbar object load 'bartexture' image?

 

what understanding of how return works in terms of execution flow?

 

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