在iOS5中，ViewController中新添加了下面幾個方法：

addChildViewController:?
removeFromParentViewController?
transitionFromViewController:toViewController:duration:options:animations:completion:
willMoveToParentViewController:?
didMoveToParentViewController:

下面詳細(xì)介紹一下addChildViewController，一個ViewController可以添加多個子ViewController，但是這些子ViewController只有一個是顯示到父視圖中的，可以通過transitionFromViewController:toViewController:duration:options:animations:completion:這個方法轉(zhuǎn)換顯示的子視圖。同時加入相應(yīng)的動畫。下面以一個例子來說明，最后實(shí)現(xiàn)的效果：

?

下面詳細(xì)介紹一下上述效果的實(shí)現(xiàn)：

創(chuàng)建項(xiàng)目，changeViewController。
添加相應(yīng)的viewController，MainViewController、FirstViewController、SecondViewController、ThirdViewController。如下圖：

3.把MainViewController添加到window中。

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions?
{?
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];?
// Override point for customization after application launch.?
MainViewController *mainViewController=[[MainViewController alloc] initWithNibName:@"MainViewController" bundle:nil];?
self.window.rootViewController=mainViewController;?
[self.window makeKeyAndVisible];?
return YES;?
}

4.在MainViewController中添加三個按鈕，并且連接onClickbutton方法。

5.在MainViewController中添加三個子controller

#pragma mark – View lifecycle

- (void)viewDidLoad?
{?
[super viewDidLoad];?
// Do any additional setup after loading the view from its nib.?

FirstViewController *firstViewController=[[FirstViewController alloc] initWithNibName:@"FirstViewController" bundle:nil];?
[self addChildViewController:firstViewController];?

SecondViewController *secondViewController=[[SecondViewController alloc] initWithNibName:@"SecondViewController" bundle:nil];?
[self addChildViewController:secondViewController];?


ThirdViewController *thirdViewController=[[ThirdViewController alloc] initWithNibName:@"ThirdViewController" bundle:nil];?
[self addChildViewController:thirdViewController];?

[contentView addSubview:thirdViewController.view];?

currentViewController=thirdViewController;?

}

其中要把其中的一個子controller的view添加到根視圖中，這樣才能顯示出相應(yīng)的視圖。

6.點(diǎn)擊按鈕，切換視圖。

-(IBAction)onClickbutton:(id)sender?
{?
FirstViewController *firstViewController=[self.childViewControllers objectAtIndex:0];?
ThirdViewController *thirdViewController=[self.childViewControllers objectAtIndex:2];?
SecondViewController *secondViewController=[self.childViewControllers objectAtIndex:1];?
if ((currentViewController==firstViewController&&[sender tag]==1)||(currentViewController==secondViewController&&[sender tag]==2) ||(currentViewController==thirdViewController&&[sender tag]==3) ) {?
return;?
}?
UIViewController *oldViewController=currentViewController;?
switch ([sender tag]) {?
case 1:?
{?
NSLog(@"留言及回復(fù)");?
[self transitionFromViewController:currentViewController toViewController:firstViewController duration:4 options:UIViewAnimationOptionTransitionFlipFromLeft animations:^{?
} completion:^(BOOL finished) {?
if (finished) {?
currentViewController=firstViewController;?
}else{?
currentViewController=oldViewController;?
}?
}];?
}?
break;?
case 2:?
{?
NSLog(@"生日提醒");?
[self transitionFromViewController:currentViewController toViewController:secondViewController duration:1 options:UIViewAnimationOptionTransitionFlipFromTop animations:^{?

} completion:^(BOOL finished) {?
if (finished) {?
currentViewController=secondViewController;?
}else{?
currentViewController=oldViewController;?
}?
}];?
}?
break;?
case 3:?
{?
NSLog(@"好友申請");?
[self transitionFromViewController:currentViewController toViewController:thirdViewController duration:1 options:UIViewAnimationOptionTransitionFlipFromBottom animations:^{?

} completion:^(BOOL finished) {?
if (finished) {?
currentViewController=thirdViewController;?
}else{?
currentViewController=oldViewController;?
}?
}];?
}?
break;?
default:?
break;?
}?
}

其中我把按鈕設(shè)置成不同的tag了。

這時候點(diǎn)擊按鈕，就可以切換子視圖了。

這樣寫的好處：

多個UIViewController之間切換可以添加動畫
當(dāng)內(nèi)存警告的時候，可以把當(dāng)前不是激活狀態(tài)的ViewController內(nèi)存釋放。
可以把代碼更好分開

原文：http://wangjun.easymorse.com/?p=1630

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