IOS 7 Study - Implementing Navigation with UINavigationController

系统管理员 2021-12-24 12:37 194阅读 0赞

**Problem**  
You would like to allow your users to move from one view controller to the other with  
a smooth and built-in animation.

**Solution**  
Use an instance of UINavigationController.

**What it's like**

If you’ve used an iPhone, iPod Touch, or iPad before, chances are that you have already  
seen a navigation controller in action. For instance, if you go to the Settings app on your  
phone and then press an option such as Wallpaper (see follow)

![201044155535077.png][]

1. Add UINavigationController property in app delegate implementation

#import "AppDelegate.h"
    #import "FirstViewController.h"
    
    @interface AppDelegate ()
    
    @property (nonatomic, strong) UINavigationController *navigationController; @end
    
    @implementation AppDelegate
    
    ...

2. Initialize our navigation controller using its **initWithRootViewController**: method and pass our **root view controller** as its parameter.

Then we will set the navigation controller as the root view controller of our window.

- (BOOL) application:(UIApplication *)application
    didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
        FirstViewController *viewController = [[FirstViewController alloc]
                                                initWithNibName:nil
                                                bundle:nil];
        self.navigationController = [[UINavigationController alloc]
                                     initWithRootViewController:viewController];
        self.window = [[UIWindow alloc]
                       initWithFrame:[[UIScreen mainScreen] bounds]];
        self.window.rootViewController = self.navigationController;
        self.window.backgroundColor = [UIColor whiteColor];
    
        [self.window makeKeyAndVisible];
    
    return YES;
    }

3. FirstViewController implementation

#import "FirstViewController.h"
    #import "SecondViewController.h"
    
    @interface FirstViewController ()
    
    @property (nonatomic, strong) UIButton *displaySecondViewController;
    
    @end
    
    @implementation FirstViewController
    
    - (void) performDisplaySecondViewController:(id)paramSender {
        SecondViewController *secondController = [[SecondViewController alloc]
                                                    initWithNibName:nil
                                                    bundle:NULL];
    
        [self.navigationController pushViewController:secondController animated:YES];
    }
    
    - (void)viewDidLoad {
        [super viewDidLoad];
        self.title = @"First Controller";
        self.displaySecondViewController = [UIButton buttonWithType:UIButtonTypeSystem];
        [self.displaySecondViewController
            setTitle:@"Display Second View Controller"
            forState:UIControlStateNormal];
        [self.displaySecondViewController sizeToFit];
        self.displaySecondViewController.center = self.view.center;
        [self.displaySecondViewController
            addTarget:self
            action:@selector(performDisplaySecondViewController:)
            forControlEvents:UIControlEventTouchUpInside];
        [self.view addSubview:self.displaySecondViewController];
    }
    
    @end

4. create this second view controller, without a .xib file

#import "SecondViewController.h"
    
    @implementation SecondViewController
    
    - (void)viewDidLoad {
        [super viewDidLoad];
        self.title = @"Second Controller";
    }
    
    - (void) goBack {
        [self.navigationController popViewControllerAnimated:YES];
    }
    
    - (void) viewDidAppear:(BOOL)paramAnimated {
        [super viewDidAppear:paramAnimated];
        [self performSelector:@selector(goBack)
            withObject:nil
            afterDelay:5.0f];
    }

转载于:https://www.cnblogs.com/davidgu/p/3557126.html

[201044155535077.png]: /images/20211223/292a089a0a9346c8a8c68a1041230955.png