031实现仿iPhone的底部选项卡

效果如下：

 

ViewController.h

1 #import <UIKit/UIKit.h>

2 

3 @interface ViewController : UITabBarController

4 @end

ViewController.m

 1 #import "ViewController.h"

 2 #import "SampleScene.h"

 3 

 4 @interface ViewController ()

 5 - (void)layoutUI;

 6 @end

 7 

 8 @implementation ViewController

 9 

10 - (void)viewDidLoad {

11     [super viewDidLoad];

12     

13     [self layoutUI];

14 }

15 

16 - (void)didReceiveMemoryWarning {

17     [super didReceiveMemoryWarning];

18     // Dispose of any resources that can be recreated.

19 }

20 

21 /**

22  *  加载的UI内容

23  */

24 - (void)layoutUI {

25     self.title = @"UITabBarController";

26     /*

27     id scene1 = [[SampleScene alloc] initWithSystemItem:UITabBarSystemItemMore badge:nil];

28     id scene2 = [[SampleScene alloc] initWithSystemItem:UITabBarSystemItemFavorites badge:nil];

29     id scene3 = [[SampleScene alloc] initWithSystemItem:UITabBarSystemItemFeatured badge:nil];

30     id scene4 = [[SampleScene alloc] initWithSystemItem:UITabBarSystemItemTopRated badge:nil];

31     id scene5 = [[SampleScene alloc] initWithSystemItem:UITabBarSystemItemRecents badge:nil];

32     id scene6 = [[SampleScene alloc] initWithSystemItem:UITabBarSystemItemContacts badge:nil];

33     id scene7 = [[SampleScene alloc] initWithSystemItem:UITabBarSystemItemHistory badge:nil];

34     */

35     id scene8 = [[SampleScene alloc] initWithSystemItem:UITabBarSystemItemBookmarks badge:nil];

36     id scene9 = [[SampleScene alloc] initWithSystemItem:UITabBarSystemItemSearch badge:nil];

37     id scene10 = [[SampleScene alloc] initWithSystemItem:UITabBarSystemItemDownloads badge:@"2"];

38     id scene11 = [[SampleScene alloc] initWithSystemItem:UITabBarSystemItemMostRecent badge:nil];

39     id scene12 = [[SampleScene alloc] initWithSystemItem:UITabBarSystemItemMostViewed badge:nil];

40     

41     id scene13 = [[SampleScene alloc] initWithFileName:@"Smile.png" title:@"微 笑" badge:@"1"];

42     [self setViewControllers:@[scene10, scene11, scene12, scene13, scene8, scene9] animated:NO]; //self必须是继承UITabBarController，而不是UIViewController才可以调用setViewControllers方法；iOS8显示是4个tabBarItem

43     self.customizableViewControllers = @[scene10, scene11, scene12, scene13, scene8, scene9]; //没啥用

44     

45     self.selectedIndex = 3; //默认值是0

46 }

47 

48 @end

SampleScene.h

 1 #import <UIKit/UIKit.h>

 2 

 3 @interface SampleScene : UIViewController

 4 @property (nonatomic, strong) UILabel *lblMessage;

 5 @property (nonatomic, assign) NSUInteger tabBarItemType;

 6 

 7 - (id)initWithSystemItem:(UITabBarSystemItem)item badge:(NSString *)badge;

 8 - (id)initWithFileName:(NSString *)fileName title:(NSString *)title badge:(NSString *)badge;

 9 

10 @end

SampleScene.m

 1 #import "SampleScene.h"

 2 

 3 @interface SampleScene ()

 4 @end

 5 

 6 @implementation SampleScene

 7 

 8 - (void)viewDidLoad {

 9     [super viewDidLoad];

10     _lblMessage = [[UILabel alloc] initWithFrame:self.view.bounds];

11     _lblMessage.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;

12     switch (_tabBarItemType) {

13         case 1:

14             _lblMessage.backgroundColor = [UIColor orangeColor];

15             break;

16         case 2:

17             _lblMessage.backgroundColor = [UIColor brownColor];

18             break;

19         case 3:

20             _lblMessage.backgroundColor = [UIColor cyanColor];

21             break;

22         default:

23             _lblMessage.backgroundColor = [UIColor lightGrayColor];

24             break;

25     }

26     

27     [self.view addSubview:_lblMessage];

28     

29     NSLog(@"viewDidLoad");

30 }

31 

32 - (void)didReceiveMemoryWarning {

33     [super didReceiveMemoryWarning];

34     // Dispose of any resources that can be recreated.

35 }

36 

37 /**

38  通过系统图标加载UITabBarItem

39  */

40 - (id)initWithSystemItem:(UITabBarSystemItem)item badge:(NSString *)badge {

41     if (self = [super init]) {

42         self.tabBarItem = [[UITabBarItem alloc] initWithTabBarSystemItem:item tag:0];

43         self.tabBarItem.badgeValue = badge;

44         

45         if (item == UITabBarSystemItemMostRecent) {

46             _tabBarItemType = 1;

47         } else if (item == UITabBarSystemItemMostViewed) {

48             _tabBarItemType = 2;

49         }

50     }

51     NSLog(@"initWithSystemItem");

52     return self;

53 }

54 

55 /**

56  通过自定义图标加载UITabBarItem

57  */

58 - (id)initWithFileName:(NSString *)fileName title:(NSString *)title badge:(NSString *)badge {

59     if (self = [super init]) {

60         UIImage *imgIcon = [UIImage imageNamed:fileName];

61         self.tabBarItem = [[UITabBarItem alloc] initWithTitle:title image:imgIcon tag:0];

62         self.tabBarItem.badgeValue = badge;

63         

64         _tabBarItemType = 3;

65     }

66     return self;

67 }

68 

69 @end