多视图应用程序

SwitchViewController 负责在按下Switch Views 时切换 BlueViewController 和 YellowViewController。

控制器类 和 对应的 .xib文件 都是单独创建。手动组建

效果图：

1、新建 Empty Application 。不选 “Use Core Data”

2、新建 SwitchViewController 类和 SwitchViewController.xib

　　　　BlueViewController 类和 BlueView.xib

　　　　YellowViewController 类和 YellowView.xib

3、编写SwitchViewController 类

#import <UIKit/UIKit.h>

@class BlueViewController;
@class YellowViewController;

@interface SwitchViewController : UIViewController

@property (strong, nonatomic) BlueViewController *blueViewController;
@property (strong, nonatomic) YellowViewController *yellowViewController;

-(IBAction)switchViews:(id)sender;

@end

#import "SwitchViewController.h"
#import "BlueViewController.h"
#import "YellowViewController.h"

@interface SwitchViewController ()

@end

@implementation SwitchViewController

@synthesize blueViewController = _blueViewController;
@synthesize yellowViewController = _yellowViewController;

-(IBAction)switchViews:(id)sender
{
    [UIView beginAnimations:@"View Flip" context:nil];
    [UIView setAnimationDuration:1.25];
    [UIView setAnimationCurve:UIViewAnimationCurveEaseInOut];
    
    if (self.yellowViewController.view.superview == nil)
    {
        if (self.yellowViewController == nil)
        {
            YellowViewController *yellowViewController = [[YellowViewController alloc] initWithNibName:@"YellowView" bundle:nil];
            self.yellowViewController = yellowViewController;
        }
        [UIView setAnimationTransition:UIViewAnimationTransitionFlipFromRight forView:self.view cache:YES];
        [self.blueViewController viewWillAppear:YES];
        [self.yellowViewController viewWillDisappear:YES];
        
        [self.blueViewController.view removeFromSuperview];
        [self.view insertSubview:self.yellowViewController.view atIndex:0];
        
        [self.yellowViewController viewWillDisappear:YES];
        [self.blueViewController viewWillAppear:YES];
    }
    else 
    {
        if (self.blueViewController == nil)
        {
            BlueViewController *blueViewController = [[BlueViewController alloc] initWithNibName:@"BlueView" bundle:nil];
            self.blueViewController = blueViewController;
        }
        
        [UIView setAnimationTransition:UIViewAnimationTransitionFlipFromRight forView:self.view cache:YES];
        [self.yellowViewController viewWillAppear:YES];
        [self.blueViewController viewWillDisappear:YES];
        
        [self.yellowViewController.view removeFromSuperview];
        [self.view insertSubview:self.blueViewController.view atIndex:0];
        
        [self.blueViewController viewWillDisappear:YES];
        [self.yellowViewController viewWillAppear:YES];
    }
    [UIView commitAnimations];
}

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) {
        // Custom initialization
    }
    return self;
}

- (void)viewDidLoad
{
    BlueViewController *blueViewController = [[BlueViewController alloc] initWithNibName:@"BlueView" bundle:nil];
    self.blueViewController = blueViewController;
    [self.view insertSubview:blueViewController.view atIndex:0];
    
    [super viewDidLoad];
    // Do any additional setup after loading the view.
}

- (void)viewDidUnload
{
    [super viewDidUnload];
    // Release any retained subviews of the main view.
}

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
    return (interfaceOrientation == UIInterfaceOrientationPortrait);
}

- (void)didReceiveMemoryWarning
{
    if (self.blueViewController.view.superview == nil)
        self.blueViewController = nil;
    else
        self.yellowViewController = nil;
}

@end

4、关联SwitchViewController类：

5、为 SwitchViewController.xib 添加 “ToolBar”，修改 “Bar Button Item” 为 “Switch Views”

　　为 “Bar Button” 添加事件关联到 -(IBAction)switchViews:(id)sender;

　　关联控制器的Outlet “view” 到 视图 “view”

6、设置  “BlueView.xib”：

　　关联BlueViewController类

　　添加背景颜色，设置视图属性

　　添加 “Round Rect Button”，添加事件：

　　关联控制器的Outlet “view” 到 视图 “view”

　　

7、修改文件

#import <UIKit/UIKit.h>

@interface BlueViewController : UIViewController

- (IBAction)blueButtonPressed:(id)sender;

@end

#import "BlueViewController.h"

@interface BlueViewController ()

@end

@implementation BlueViewController

- (IBAction)blueButtonPressed:(id)sender
{
    UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Blue View Button Pressed" 
                                                                    message:@"You pressed the button on the blue view" 
                                                                    delegate:nil 
                                                                    cancelButtonTitle:@"Yep, I did." 
                                                                    otherButtonTitles:nil];
    [alert show];
}

// 省略其他方法

@end

8、设置“YellowView.xib” 和修改 YellowViewController 类 分别同6，7。

9、修改 AppDelegate 类

@class SwitchViewController;

@interface AppDelegate : UIResponder <UIApplicationDelegate>

@property (strong, nonatomic) UIWindow *window;
@property (strong, nonatomic) SwitchViewController *switchViewController;

@end

#import "AppDelegate.h"
#import "SwitchViewController.h"

@implementation AppDelegate

@synthesize window = _window;
@synthesize switchViewController = _switchViewController;

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

@end

。