IOS学习笔记（5）UINavigationController UITabBarController

UINavigationController实现导航

在App委托中的.h文件里

@property( nonatomic ,strong)UINavigationController *nav;

.m文件里

@synthesize nav;

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

     self.nav = [ [UINavigationController alloc]initWithRootViewController:self.rootViewController];

    [self.window addSubview:  self.nav.view ];

    return YES;

}

在viewController页面里面

-(void)viewDidLoad{

   self.title = @"hello World";

}

更深一点的：

想在第一个视图控制器出现在屏幕上5秒后把第二个视图控制器拖到它的顶部：

首先在第一个视图控制器放入第二个视图控制器：

#import "SecondViewController"

-(void)pushSecondController{

    SecondViewController *secondController = [ [ SecondViewController alloc]initWithNibName:nil bundle:NULL];

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

}

-(void)viewDidAppear:(BOOL)paramAnimated{

    [super viewDidAppear:paramAnimated];

    [self performSelector:@selecter(pushSecondController) withObject:nil afterDelay:5.0f];    

}

既然能够拖进来，那么就能移出去：

-(void)goBack{

    [ self.navigationController  popViewControllerAnimated:YES];

}

-(void)DidAppear:(BOOL)paramAnimated{

    [super viewDidAppear:paramAnimated];

    [self performSelector:@selector(goBack) withObject:nil afterDelay:5.0f];

}

调整视图控制器中导航控制器的序列

使用 UINavigationController 类的viewControllers属性获得并修改与导航控制器关联的视图控制器的排列顺序:

-(void)goBack{

    NSArray *currentControllers =  self.navigationController.viewControllers;

    NSMutableArray *newControllers = [NSMutableArray arrayWithArray:currentControllers];

    [newControllers removeLastObject];

     self.navigationController.viewControllers = newControllers;

    //动画完成

    //[self.navigationController setViewControllers:newControllers animated:YES];

}

为了从当前视图控制器相关联的导航控制器的层次结构中推送最后一个视图控制器,可以在任何视图控制器内调用此方法。

在导航栏展示一张图片

要在导航控制器的当前视图中的标题中用一张图片代替文本

-(void)viewDidLoad{

    [super viewDidLoad];

    self.view.backgroundColor = [UIColor whiteColor];

    UIImageView *imageView = [ [UIImageView alloc] initWithFrame:CGRectMake(0.0f,0.0f,100.0f,40.0f);

    imageView.contentMode = UIViewContentModeScaleAspectFit;

    UIImage *image = [UIImage imageNamed:@"FullSizeLogo.png"];

    [imageView setImage:image];

    self.navigationItem.titleView = imageView;

}

以上部分demo下载

使用UIBarButtonItem类在导航栏里面添加按钮

创建一个导航按钮前提：创建一个UIBarButtonItem类实例，使用视图空间的NavigationItem属性给导航栏添加按钮。NavigationItem属性允许我们设置这个导航栏。这个属性自身有两个属性，分别为rightBarButtonItem 和 leftBarButtonItem 。这两个属性都属于UIBarButtonItem类。

-(void)viewDidLoad{

    [super viewDidLoad];

    self.view.backgroundColor = [UIColor whiteColor];

    self.title = @"hello World";

    self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc]initWithTitle:@"right" style:UIBarButtonItemStylePlain target:self action:@selector(performRight:)];

}

-(void) performRight:(id)right{

    NSLog(@"clicked rightButton");

}

系统按钮初始化方法一：

initWithBarButtonSystemItem：target：action：初始化方法

self.navigationItem.leftBarButtonItem = [ [UIBarButtonItem alloc] initWithBartButtonSystemItem:UIBarButtonSystemItemAdd target:self action:@selector(performRight:)];

导航按钮的初始化按钮：

typedef enum{

    UIBarButtonSystemItem Done/Cancel/Edit/Save/Add/FlexibleSpace/FixedSpace/Compose/Reply/Action/Organize/Bookmarks/Search/Refresh/Stop/Camera/Trash/Play/Pause/Rewind/FastForward/Undo/Redo/PageCurl/

}UIBarButtonSystemItem;

系统按钮初始化方法二：

initWithCustomView：方法（可以将UISwitch添加）

-(void)viewDidLoad{

    [super viewDidLoad];

    self.view.backgroundColor = [UIColor whiteColor];

    self.title = @"hello World";

    UISwitch *mySwitch = [ [UISwitch alloc]init];

    mySwitch.on = YES;

    [mySwitch addTarget:self action:@selector(SwitchChanged:) forControlEvents:UIControlEventValueChanged];

    self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithCustomView:mySwitch];

}

可以了，测试一下吧。

那么再做一个上下箭头的demo吧。

-(void)viewDidLoad{

    [super viewDidLoad];

    self.view.backgroundColor = [UIColor whiteColor];

    self.title = @"hello World";

    NSArray *items = [[NSArray alloc]initWithObjects:[UIImage imageNamed:@"UpArrow.png"],[UIImage imageNamed:@"DownArrow.png"],nil];

    UISegmentedControl *segmentedControl = [ [UISegmentedControl alloc]initWithItems:items];

    segmentedControl.segmentedControlStyle = UISegmentedControlStyleBar;

    segmentedControl.momentary = YES;

    [segmentedControl addTarget:self action:@selector(segmentedControlTapped:) forControlEvents:UIControlEventValueChanged];

    self.navigationItem.rightBarButtonItem = [ [UIBarButtonItem alloc]initWithCustomView:segmentedControl];

    //设置动画

    //UIBarButtonItem *rightBarButton = [[UIBarButtonItem alloc] initWithCustomView:segmentedControl];

    [self.navigationItem setRightBarButtonItem:rightBarButton animated:YES];

}

使用UITabBarController显示多视图控制器

AppDelegate.h里面

@class FirstViewController;

@class SecondViewController;

@property( nonatomic,strong)FirstViewController *firstViewController;

@property(non atomic,strong)SecondViewController *secondViewController;

@property(non atomic,strong)UITableBarController *tabBarController;

AppDelegate.m文件里

@synthesize firstViewController,secondViewController,tabBarController;

self.firstViewController = [[FirstViewController alloc]initWithNibName:nil bundle:NULL];

self.secondViewController = [[SecondViewController alloc]initWithNibName:nil bundle:NULL];

NSArray *twoViewControllers = [ [NSArray alloc]initWithObjects:self.firstViewController,self.secondViewController,nil];

self.tabBarController = [[UITabBarController alloc]init];

[self.tabBarController setViewControllers:twoViewControllers];

运行程序一看，没有导航啊。怎么办呢？接着往下进行吧。

在AppDelegate.h中

@proterty(non atomic,strong)UINavigationController *nav;

在AppDelegate.m文件里

@synthesize nav;

self.firstNavigationController = [[UINavigationController alloc]initWithRootViewController:self.firstViewController];

self.secondNavigationController = [[UINavigationController alloc]initWithRootViewController:self.secondViewController];

NSArray *twoNavigationController = [[NSArray alloc]initWithObjects:self.firstNavigationController,self.secondNavigationController,nil];

self.tabBarController = [[UITabBarController alloc]init];

[self.tabBarController setViewControllers:twoNavigationController];

self.window addSubview:self.tabBarController.view];

tabbarItem属性：

firstViewController.m

-(id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil{

    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];

    if(self!=nil){

        self.title = @"First";

        self.tabBarItem.image = [UIImage image named:@"FirstTb.png"];

    }

    return self;

}

secondViewController 同上

下面部分demo 下载