模态与非模态进入和退出UIViewController以及UINavigationController简单用法

UIViewController有两个常用属性,一个控制导航显示内容，一个是自身导航控制器

@property(nonatomic,readonly,retain)UINavigationItem
*navigationItem;// Created on-demand so that a view controller may customize its navigation appearance.
@property(nonatomic,readonly,retain)UINavigationController
*navigationController;// If this view controller has been pushed onto a navigation controller, return it.

UINavigationItem的常用属性

@property(nonatomic,copy) NSString *title;
// Title when topmost on the stack. default is nil 导航视图控制器标题

@property(nonatomic,retain)UIBarButtonItem *leftBarButtonItem; // 左导航键

@property(nonatomic,retain)UIBarButtonItem *rightBarButtonItem; //右导航键

UIBarButtonItem常用构造方法

- (id)initWithTitle:(NSString *)title style:(UIBarButtonItemStyle)style target:(id)target action:(SEL)action;

UINavigationController继承自UIViewController

一般用法是创建一个UINavigationController将UIViewController设置为它的根视图来显示

常用属性

@property(nonatomic,readonly)UINavigationBar *navigationBar;//
The navigation bar managed by the controller. Pushing, popping or setting navigation items on a managed navigation bar is not supported.

// 常常将它的属性 translucent 设置为NO来控制导航栏不透明，此时坐标原点移动到导航栏下方视图的左上角

UINavigationBar 常用属性

@property(nonatomic,assign,getter=isTranslucent)BOOL
translucent NS_AVAILABLE_IOS(3_0);// Default is NO on iOS 6 and earlier. Always YES if barStyle is set to UIBarStyleBlackTranslucent

示例

AppDelegate.m中

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

{

self.window = [[[UIWindowalloc]initWithFrame:[[UIScreenmainScreen]bounds]]autorelease];

// Override point for customization after application launch.

self.window.backgroundColor = [UIColorwhiteColor];

FirstViewController * firstViewController = [[FirstViewControlleralloc]init];

UINavigationController * nav = [[UINavigationControlleralloc]initWithRootViewController:firstViewController];

[self.windowsetRootViewController:nav];

[self.windowmakeKeyAndVisible];

return YES;

}

FirstViewController.m中

- (void)viewDidLoad

{

[superviewDidLoad];

// Do any additional setup after loading the view.

//设置导航标题和导航右键

[self.navigationItemsetTitle:@"第一视图"];

[self.navigationController.navigationBarsetTranslucent:NO];//设置导航栏不透明

UIBarButtonItem * rightBarButtonItem = [[UIBarButtonItemalloc]initWithTitle:@"next"style:UIBarButtonItemStyleDonetarget:selfaction:@selector(btnAction)];

[self.navigationItemsetRightBarButtonItem:rightBarButtonItem];

[rightBarButtonItem release];

//测试按钮

UIButton * btn = [[UIButtonalloc]initWithFrame:CGRectMake(60,200,200,50)];

[btn setBackgroundColor:[UIColorgrayColor]];

[btn setTitle:@"进入下一视图控制器" forState:UIControlStateNormal];

[btn addTarget:selfaction:@selector(btnAction)forControlEvents:UIControlEventTouchUpInside];

[self.view
addSubview:btn];

[btn release];

}

-(void)btnAction

{

SecondViewController * secondViewController = [[SecondViewControlleralloc]init];

//模态进入

//UINavigationController * nav = [[UINavigationController alloc] initWithRootViewController:secondViewController];

//[self presentViewController:nav animated:NO completion:^{}];

//[secondViewController release];

//[nav release];

//非模态进入

[self.navigationControllerpushViewController:secondViewControlleranimated:NO];

[secondViewController release];

}

SecondViewController中

- (void)viewDidLoad

{

[superviewDidLoad];

// Do any additional setup after loading the view.

//设置导航标题和导航左键

[self.navigationItemsetTitle:@"第二视图"];

UIBarButtonItem * leftBarButtonItem = [[UIBarButtonItemalloc]initWithTitle:@"previous"style:UIBarButtonItemStyleDonetarget:selfaction:@selector(btnAction)];

[self.navigationItemsetLeftBarButtonItem:leftBarButtonItem];

[leftBarButtonItem release];

//测试按钮事件

UIButton * btn = [[UIButtonalloc]initWithFrame:CGRectMake(60,200,200,50)];

[btn setBackgroundColor:[UIColorgreenColor]];

[btn setTitle:@"返回上一视图控制器" forState:UIControlStateNormal];

[btn addTarget:selfaction:@selector(btnAction)forControlEvents:UIControlEventTouchUpInside];

[self.view
addSubview:btn];

[btn release];

}

-(void)btnAction

{

//模态返回

//[self dismissViewControllerAnimated:NO completion:^{}];

//非模态返回

[self.navigationControllerpopViewControllerAnimated:NO];

}