转载：http://blog.csdn.net/Hierarch_Lee/article/details/50823575
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
self.view.backgroundColor = [UIColor greenColor];
self.navigationController.navigationBar.titleTextAttributes = @{NSForegroundColorAttributeName:[UIColor redColor]};
[self.navigationController.navigationBar setBackgroundImage:[[UIImage alloc] init] forBarMetrics:UIBarMetricsDefault];
}
