修改UINavigationController，UINavigationBar背景颜色，字体颜色

- (void)setNav

{

    UINavigationBar *bar = [UINavigationBar appearance];

    //设置显示的颜色

    bar.barTintColor = [UIColor colorWithRed:62/255.0 green:173/255.0 blue:176/255.0 alpha:1.0];

    //设置字体颜色

    bar.tintColor = [UIColor whiteColor];

    [bar setTitleTextAttributes:@{NSForegroundColorAttributeName : [UIColor whiteColor]}];

//或者用这个都行

//    [bar setTitleTextAttributes:@{UITextAttributeTextColor : [UIColor whiteColor]}];

}

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

//*********

[self setNav];//修改程序中所有的显示的navigationbar的颜色，字体

//********

}

如图