Stuck on code challenge 3:Now we want to change the color of the text of our navigation buttons to white color...

#import "AppDelegate.h"

@implementation AppDelegate

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {

// Customize the nav bar
    UIImage *backgroundImage = [UIImage imageNamed:@"navBarBackground"];
    [[UINavigationBar appearance] setBarTintColor:[UIColor redColor]];
    [[UINavigationBar appearance] setBackgroundImage:backgroundImage forBarMetrics:UIBarMetricsDefault];

Solution 1 - based on track video; result: did not work
    [[UINavigationBar appearance] setTextTitleAttributes:[NSDictionary dictionaryWithObjectsAndKeys:[UIColor whiteColor],UITextAttributeTextColor,nil]];

Solution 2 - based on track notes; result: did not work
    [[UINavigationBar appearance] setTitleTextAttributes:[NSDictionary dictionaryWithObjectsAndKeys:[UIColor whiteColor], NSForegroundColorAttributeName, nil]];

 Solution 3 - based on post above: result: did not work
    [[UINavigationBar appearance]setTitleTextAttributes:@{NSForegroundColorAttributeName: [UIColor whiteColor]}];

     return YES;
}

@end