UITabBarController

1.組成app

最下層是:tabbar 中間是:custom content  最上面:Tab bar controller viewide

Tab Bar上面顯示的每個Tab都對應着一個View Controller.atom

ViewController自己具備一個tabBarItem屬性,只要設置它,就能改變Tab Bar上對應的顯示內容。spa

若是不主動設置,系統將會根據viewController的標題自動建立一個,該tabBarItem中會顯示文字,沒有圖像。本身建立UITabBarItem,能夠指定顯示的圖像和對應的文字。code

UITabBarItem還有一個badgeValue,該屬性能夠在其右下角顯示一個小的角標,一般用於提示用戶有新的消息。blog

2.使用方式it

加載方式io

a.application delegate中的applicationDidFinishLanunching:方法中建立和加載,由於UITabBarController一般做爲整個程序的rootViewControllerevent

b.與UINavigationController結合,如IPhone的音樂和App Storeclass

 

 1 #import "AppDelegate.h"
 2 #import "FirstViewController.h"
 3 #import "SecondViewController.h"
 4 #import "ThridViewController.h"
 5 
 6 @interface AppDelegate ()
 7 
 8 @property (retain,nonatomic) UITabBarController *tarBar;
 9 @end
10 
11 @implementation AppDelegate
12 
13 
14 - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
15     // Override point for customization after application launch.
16     
17     self.window=[[UIWindow alloc]initWithFrame:[[UIScreen mainScreen] bounds]];
18     self.window.backgroundColor=[UIColor whiteColor];
19     [self.window makeKeyAndVisible];
20     
21     self.tarBar=[[UITabBarController alloc]init];
22     
23     FirstViewController *f=[[FirstViewController alloc]init];
24     SecondViewController *s=[[SecondViewController alloc]init];
25     ThridViewController *t=[[ThridViewController alloc]init];
26  
27     f.tabBarItem=[[UITabBarItem alloc]initWithTitle:@"第一個" image:[UIImage imageNamed:@"calendar.png"] tag:0];
28     s.tabBarItem=[[UITabBarItem alloc]initWithTitle:@"第二個" image:[UIImage imageNamed:@"datashow.png"] tag:1];
29     t.tabBarItem=[[UITabBarItem alloc]initWithTitle:@"第三個" image:[UIImage imageNamed:@"number.png"] tag:2];
30    // f.tabBarItem.badgeValue=@"99+";
31     s.tabBarItem.badgeValue=@"中文";
32     self.tarBar.viewControllers=[NSArray arrayWithObjects:f,s,t, nil];
33     self.window.rootViewController=self.tarBar;
34     
35     return YES;
36 }
View Code
相關文章
相關標籤/搜索