[UI组件基础] 制作一个带有底部导航以及顶部导航的single view application

 1 - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
 2     // Override point for customization after application launch.
 3     
 4     //1.创建窗口
 5     self.window = [[UIWindow alloc]init];
 6     //2.设置窗口位置，大小
 7     self.window.frame = [UIScreen mainScreen].bounds;
 8     
 9     //3.显示窗口
10     [self.window makeKeyAndVisible];
11     //4.设置主window的根视图控制器为自定义的myTabViewController（自定义的UITabBarController）
12     self.window.rootViewController = [[myTabViewController alloc]init];
13 
14     return YES;
15 }

 1 #import "myTabViewController.h"
 2 
 3 @interface myTabViewController ()
 4 
 5 @end
 6 
 7 @implementation myTabViewController
 8 
 9 - (void)viewDidLoad {
10     [super viewDidLoad];
11     
12     /**
13      创建3个UIViewController，1个UITableViewController，并执行封装的addChildVC方法
14      */
15     UIViewController* home=[[UIViewController alloc]init];
16     [self addChildVC:home title:@"首页" image:@"tabbar_home" selectedImage:@"tabbar_home_selected"];
17     
18     UITableViewController* msg=[[UITableViewController alloc]init];
19     [self addChildVC:msg title:@"消息" image:@"tabbar_message_center" selectedImage:@"tabbar_message_center_selected"];
20     
21     UIViewController* discover=[[UIViewController alloc]init];
22     [self addChildVC:discover title:@"发现" image:@"tabbar_discover" selectedImage:@"tabbar_discover_selected"];
23     
24     UIViewController* profile=[[UIViewController alloc]init];
25     [self addChildVC:profile title:@"我" image:@"tabbar_profile" selectedImage:@"tabbar_profile_selected"];
26 }
27 /**
28  *  为当前控制器生成并添加子控制器，该控制被包含在一个UINavigationController中，然后再被添加到当前控制器（UITabBarController）
29  *
30  *  @param childVc       需要进行添加的子控制器
31  *  @param title         导航标题与tabbar标题
32  *  @param image         普通形态下的tabbarItem的图片
33  *  @param selectedImage 高亮显示的tabbarItem的图片
34  */
35 -(void)addChildVC:(UIViewController*)childVc title:(NSString*)title image:(NSString*)image selectedImage:(NSString*)selectedImage
36 {
37     //设置导航标题与下标题一致
38     childVc.navigationItem.title=title;
39     childVc.tabBarItem.title=title;
40     //childVc.title=title;//这一句可以完成上面两句代码的作用
41     
42     //设置子控制器的tabbarItem（即在下方显示的一排导航内容）正常显示图片
43     //imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal（图片的表现模式:原图显示）
44     //注意：如果直接给一张图片会被渲染成默认的颜色，所以要设置为不要被渲染的模式
45     //即imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal
46     childVc.tabBarItem.image = [[UIImage imageNamed:image] imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];
47     //设置子控制器的tabbarItem的高亮显示图片
48     childVc.tabBarItem.selectedImage = [[UIImage imageNamed:selectedImage] imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];
49     //childVc.view.backgroundColor = RandomColor;
50     //设置未选中文字的样式
51     NSMutableDictionary* textAttrs=[NSMutableDictionary dictionary];
52     textAttrs[NSForegroundColorAttributeName] = [UIColor blackColor];
53     [childVc.tabBarItem setTitleTextAttributes:textAttrs forState:UIControlStateNormal];
54     //设置选中文字的样式
55     NSMutableDictionary* seltextAttrs=[NSMutableDictionary dictionary];
56     seltextAttrs[NSForegroundColorAttributeName] = [UIColor orangeColor];
57     [childVc.tabBarItem setTitleTextAttributes:seltextAttrs forState:UIControlStateSelected];
58     
59     //将子控制器包装到一个UINavigationController中
60     UINavigationController* nav=[[UINavigationController alloc] initWithRootViewController:childVc];
61     
62     //将包装好的UINavigationController添加到本控制器的子视图控制器中
63     [self addChildViewController:nav];
64 }