【代码笔记】iOS-自定义导航条颜色

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
// Override point for customization after application launch.

RootViewController *rootVC=[[RootViewController alloc]init];
UINavigationController *nav=[[UINavigationController alloc]initWithRootViewController:rootVC];

// UIBarMetricsDefault:用竖着（拿手机）时UINavigationBar的标准的尺寸来显示UINavigationBar.
//UIBarMetricsLandscapePhone:用横着时UINavigationBar的标准尺寸来显示UINavigationBar
[nav.navigationBar setBackgroundImage:[UIImage imageNamed:@"1.jpg"] forBarMetrics:UIBarMetricsDefault];

self.window.rootViewController=nav;

self.window.backgroundColor = [UIColor whiteColor];
[self.window makeKeyAndVisible];
return YES;
}