IOS StroyBoard 切换操作

storyboard之间的切换有三种方法：

[self presentViewController:viewControllerToPresent animated:YES completion:nil];

[self.navigationController pushViewController:viewControllerToPresent animated:YES];

[self.navigationController setViewControllers:ViewControllers animated:YES];

前两种方法都是在当前VC的基础上进行PUSH操作，

第三种方法可以自己排列当前的VC栈，一个典型的案例是：当前登录状态下，退出登录，需要重新返回到登录界面，这个时候当前登录界面就成为根界面（所有的界面都是退不回去），用setViewControllers。

程序设计为这样：

    1，新建Empty工程

    2，创建故事板FirstStoryBoard，先后拖进Navigation Controller，Tab Bar Controller（自动生成2个普通的View Controller），再拖进一个View Controller，成为Tab Bar Controller的第三个Tab。

        Navigation Controller和Tab Bar Controller用root view进行segue，Tab Bar Controller和View Controller之间用view controllers进行segue。

        更改Tab Bar Controller的identity属性面板中的Storyboard id为TABBAR。

        更改View Controller的Tab Bar Item的名称为Tab1，Tab2，Tab3，之后Tab Bar Controller的显示名称也同时变成Tab1，Tab2，Tab3。

        在Tab2所对应的第二个View Controller添加一个按钮，按钮文本为：这是FirstStoryBoard，点击切换到SecondStoryBoard。

        向导添加ViewControllerFirstTab2类，继承UIViewController，增加按钮的action动作，后面添加代码。

    3，创建故事板SecondStoryBoard，拖进Navigation Controller，View Controller，用root view进行segue。

        更改View Controller的identity属性面板中的Storyboard id为SenondViewController。

        在View Controller添加第一个按钮，按钮文本为：这是SecondStoryBoard，点击切换到SecondStoryBoard。

        在View Controller添加第二个按钮，按钮文本为：这是SecondStoryBoard，点击切换到FirstStoryBoard。

        向导添加ViewControllerSecond类，增加按钮的action动作，后面添加代码。

    4，创建故事板ThirdStoryBoard，拖进Navigation Controller，View Controller，用root view进行segue。

        更改View Controller的Show the identity inspector属性面板中的Storyboard id为ThreeViewController。

        在View Controller添加第一个按钮，按钮文本为：这是SecondStoryBoard，点击切换到SecondStoryBoard。

        在View Controller添加第二个按钮，按钮文本为：这是SecondStoryBoard，点击切换到FirstStoryBoard。

        向导添加ViewControllerThird类，增加按钮的action动作，后面添加代码。

下面开始添加代码：

1，

AppDelegate.m代码：

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions

{

    self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];

    // Override point for customization after application launch.

    self.window.backgroundColor = [UIColor whiteColor];

    [self.window makeKeyAndVisible];

    UIStoryboard *StoryBoard = [UIStoryboard storyboardWithName:@"FirstStoryBoard" bundle:nil];

    self.window.rootViewController=[StoryBoard instantiateInitialViewController];

    return YES;

}

 2，

ViewControllerFirstTab2.h代码：

@interface ZViewControllerFirstTab2 : UIViewController

- (IBAction)buttonActionSecond:(id)sender;

@end

ViewControllerFirstTab2.m代码：

- (IBAction)buttonActionSecond:(id)sender {

    NSString *NSStringStoryBoard = @"SecondStoryBoard";

    NSString *NSStringVC = @"Second";

    UIStoryboard *Storyboard = [UIStoryboard storyboardWithName:NSStringStoryBoard bundle:nil];

    if(nil == Storyboard) NSLog(@"NO %@", NSStringStoryBoard);

    UIViewController *VC = [Storyboard instantiateViewControllerWithIdentifier:NSStringVC];

    if(nil == VC) NSLog(@"NO %@", NSStringVC);

    /*

     /// 该方法直接操作VC，不需要NAV，与presentViewController对应的函数是dismissViewControllerAnimated

     /// 该函数已经废弃

     /// [self presentModalViewController:[Storyboard instantiateInitialViewController] animated:(TRUE)];

     [self presentViewController:VC animated:YES completion:nil];

     */

    if(nil == self.navigationController) NSLog(@"null navigationController");

    else

    {

        self.navigationController.navigationBarHidden = YES;

        [self.navigationController pushViewController:VC animated:YES];

    }

}

3，

ViewControllerSecond.h代码：

@interface ZViewControllerSecond : UIViewController

- (IBAction)buttonActionThree:(id)sender;

- (IBAction)buttonActionOne:(id)sender;

@end

ViewControllerSecond.m代码：

- (IBAction)buttonActionThree:(id)sender {

    NSString *NSStringStoryBoard = @"ThirdStoryBoard";

    NSString *NSStringVC = @"Third";

    UIStoryboard *Storyboard = [UIStoryboard storyboardWithName:NSStringStoryBoard bundle:nil];

    if(nil == Storyboard) NSLog(@"NO %@", NSStringStoryBoard);

    UIViewController *VC = [Storyboard instantiateViewControllerWithIdentifier:NSStringVC];

    if(nil == VC) NSLog(@"NO %@", NSStringVC);

    /*

    /// 该方法直接操作VC，不需要NAV，与presentViewController对应的函数是dismissViewControllerAnimated

    /// 该函数已经废弃

    /// [self presentModalViewController:[Storyboard instantiateInitialViewController] animated:(TRUE)];

    [self presentViewController:VC animated:YES completion:nil];

    */

    if(nil == self.navigationController) NSLog(@"null navigationController");

    else

    {

        self.navigationController.navigationBarHidden = YES;

        [self.navigationController pushViewController:VC animated:YES];

    }

}

- (IBAction)buttonActionOne:(id)sender {

    /// 返回第一个界面时，第一个界面保留切换时的状态

    /// [self dismissViewControllerAnimated:YES completion:nil];

    [self.navigationController popViewControllerAnimated:YES];

}

4，

ViewControllerThird.h代码：

@interface ZViewControllerThird : UIViewController

- (IBAction)buttonActionSecond:(id)sender;

- (IBAction)buttonActionFirst:(id)sender;

@end

ViewControllerThird.m代码：

- (IBAction)buttonActionSecond:(id)sender

{

    /// [self dismissViewControllerAnimated:YES completion:nil];

    [self.navigationController popViewControllerAnimated:YES];

}

- (IBAction)buttonActionFirst:(id)sender

{

    NSString *NSStringStoryBoard = @"FirstStoryBoard";

    NSString *NSStringVC = @"TABBAR";

    UIStoryboard *Storyboard = [UIStoryboard storyboardWithName:NSStringStoryBoard bundle:nil];

    UIViewController *VC = [Storyboard instantiateViewControllerWithIdentifier:NSStringVC];

    if(nil == self.navigationController) NSLog(@"null navigationController");

    NSMutableArray *ViewControllers = [self.navigationController.viewControllers mutableCopy];

    [ViewControllers removeAllObjects];

    [ViewControllers addObject:VC];

    NSLog(@"%d", [ViewControllers count]);

    [self.navigationController setViewControllers:ViewControllers animated:YES];

}