UIViewController 可以添加过渡动画了
下面详细介绍一下addChildViewController，一个ViewController可以添加多个子ViewController，但是这些子ViewController只有一个是显示到父视图中的，可以通过transitionFromViewController:toViewController:duration:options:animations:completion:这个方法转换显示的子视图。同时加入相应的动画。
AD：
在iOS5中，ViewController中新添加了下面几个方法：
1. addChildViewController:
2. removeFromParentViewController
3. transitionFromViewController:toViewController:duration:options:animations:completion:
4. willMoveToParentViewController:
5. didMoveToParentViewController:
下面详细介绍一下addChildViewController，一个ViewController可以添加多个子ViewController，但是这些子ViewController只有一个是显示到父视图中的，可以通过transitionFromViewController:toViewController:duration:options:animations:completion:这个方法转换显示的子视图。同时加入相应的动画。下面以一个例子来说明，最后实现的效果：
点击其中的按钮如下：
下面详细介绍一下上述效果的实现：
. 创建项目，changeViewController。
. 添加相应的viewController，MainViewController、FirstViewController、SecondViewController、ThirdViewController。如下图：
3.把MainViewController添加到window中。
1. - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
2. {
3. self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
4. // Override point for customization after application launch.
5. MainViewController *mainViewController=[[MainViewController alloc] initWithNibName:@"MainViewController" bundle:nil];
6. self.window.rootViewController=mainViewController;
7. [self.window makeKeyAndVisible];
8. return YES;
9. }
4.在MainViewController中添加三个按钮，并且连接onClickbutton方法。
5.在MainViewController中添加三个子controller
1. #pragma mark – View lifecycle - (void)viewDidLoad
2. {
3. [super viewDidLoad];
4. // Do any additional setup after loading the view from its nib.
5.
6. FirstViewController *firstViewController=[[FirstViewController alloc] initWithNibName:@"FirstViewController" bundle:nil];
7. [self addChildViewController:firstViewController];
8.
9. SecondViewController *secondViewController=[[SecondViewController alloc] initWithNibName:@"SecondViewController" bundle:nil];
10. [self addChildViewController:secondViewController];
11.
12.
13. ThirdViewController *thirdViewController=[[ThirdViewController alloc] initWithNibName:@"ThirdViewController" bundle:nil];
14. [self addChildViewController:thirdViewController];
15.
16. [contentView addSubview:thirdViewController.view];
17. currentViewController=thirdViewController;
18. }
其中要把其中的一个子controller的view添加到根视图中，这样才能显示出相应的视图。
6.点击按钮，切换视图。
1. -(IBAction)onClickbutton:(id)sender
2. {
3. FirstViewController *firstViewController=[self.childViewControllers objectAtIndex:0];
4. ThirdViewController *thirdViewController=[self.childViewControllers objectAtIndex:2];
5. SecondViewController *secondViewController=[self.childViewControllers objectAtIndex:1];
6. if ((currentViewController==firstViewController&&[sender tag]==1)||(currentViewController==secondViewController&&[sender tag]==2) ||(currentViewController==thirdViewController&&[sender tag]==3) ) {
7. return;
8. }
9. UIViewController *oldViewController=currentViewController;
10. switch ([sender tag]) {
11. case 1:
12. {
13. NSLog(@"留言及回复");
14. [self transitionFromViewController:currentViewController toViewController:firstViewController duration:4 options:UIViewAnimationOptionTransitionFlipFromLeft animations:^{
15. } completion:^(BOOL finished) {
16. if (finished) {
17. currentViewController=firstViewController;
18. }else{
19. currentViewController=oldViewController;
20. }
21. }];
22. }
23. break;
24. case 2:
25. {
26. NSLog(@"生日提醒");
27. [self transitionFromViewController:currentViewController toViewController:secondViewController duration:1 options:UIViewAnimationOptionTransitionFlipFromTop animations:^{
28.
29. } completion:^(BOOL finished) {
30. if (finished) {
31. currentViewController=secondViewController;
32. }else{
33. currentViewController=oldViewController;
34. }
35. }];
36. }
37. break;
38. case 3:
39. {
40. NSLog(@"好友申请");
41. [self transitionFromViewController:currentViewController toViewController:thirdViewController duration:1 options:UIViewAnimationOptionTransitionFlipFromBottom animations:^{
42.
43. } completion:^(BOOL finished) {
44. if (finished) {
45. currentViewController=thirdViewController;
46. }else{
47. currentViewController=oldViewController;
48. }
49. }];
50. }
51. break;
52. default:
53. break;
54. }
55. }
其中我把按钮设置成不同的tag了。
这时候点击按钮，就可以切换子视图了。
这样写的好处： 多个UIViewController之间切换可以添加动画 当内存警告的时候，可以把当前不是激活状态的ViewController内存释放。
可以把代码更好分开 项目源代码：http://easymorse-iphone./svn/trunk/changeViewController/
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