UINavigationController, 导航控制器
单视图控制器工程, window的rootViewController只能管理一个视图控制器
缺点: 切换页面必须手动修改代码
self.window.rootViewController = [[[RootViewController alloc] init] autorelease];
多视图控制器工程
如何切换视图控制器?
UINavigationController, 导航控制器, 继承于UIViewController, 用与管理具有层级关系的多个视图控制器
FirstViewController *firstVC = [[FirstViewController alloc] init];
创建导航控制器, 并指定它管理的第一个页面(视图控制器)
UINavigationController *navC = [[UINavigationController alloc] initWithRootViewController:firstVC];
指定window的rootViewController为导航控制器
self.window.rootViewController = navC;
释放
[firstVC release];
[navC release];
导航控制器如何管理视图控制器?
1.以栈的形式管理视图控制器
2.切换到下一个页面, 需要入栈(压栈)
3.返回到上一个页面, 需要出栈, 第一个页面不能出栈
4.哪一个页面在栈顶, 就显示哪一个页面
UINavigationBar, 导航栏, 继承于UIView
UINavigationController自带一个UINavigationBar
UINavigationController管理的视图控制器共用一个UINavigationBar
UINavigationBar, 竖屏高44, 横屏高30
半透明效果(毛玻璃效果), 默认YES
navC.navigationBar.translucent = YES;
透明: y值0从顶部开始
不透明: y值0从导航栏底部开始
导航栏颜色
navC.navigationBar.barTintColor = [UIColor colorWithRed:0.549 green:1.000 blue:0.987 alpha:1.000];
导航栏样式
navC.navigationBar.barStyle = UIBarStyleBlack;
导航栏渲染色, 文字和按钮的渲染色
navC.navigationBar.tintColor = [UIColor whiteColor];
UINavigationItem, 用于管理标题和按钮, 继承于NSObject
导航控制器管理的视图控制器都有一个UINavigationItem
"FirstViewController.m #import "FirstViewController.h" #import "SecondViewController.h" @interface FirstViewController () @end @implementation FirstViewController - (void)viewDidLoad { [super viewDidLoad]; self.view.backgroundColor = [UIColor colorWithRed:0.932 green:1.000 blue:0.438 alpha:1.000]; UIButton *button = [UIButton buttonWithType:UIButtonTypeSystem]; [button setTitle:@"进入SecondVC" forState:UIControlStateNormal]; button.frame = CGRectMake(100, 100, 175, 40); [button addTarget:self action:@selector(goToSecondVC) forControlEvents:UIControlEventTouchUpInside]; [self.view addSubview:button]; //设置标题和按钮 //设置标题 self.navigationItem.title = @"第一页"; //自定义标题视图 UISegmentedControl *segment = [[UISegmentedControl alloc] initWithItems:@[@"已接电话", @"未接电话"]]; self.navigationItem.titleView = segment; [segment release]; //右侧按钮 //UIBarButtonItem, 继承于UIBarItem, 导航栏上的按钮 UIBarButtonItem *right = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:(UIBarButtonSystemItemDone) target:self action:@selector(pressRight)]; self.navigationItem.rightBarButtonItem = right; [right release]; //多个右侧按钮 UIBarButtonItem *right1 = [[UIBarButtonItem alloc] initWithTitle:@"水上漂" style:(UIBarButtonItemStylePlain) target:self action:@selector(pressRight)]; UIBarButtonItem *right2 = [[UIBarButtonItem alloc] initWithImage:[UIImage imageNamed:@"1"] style:(UIBarButtonItemStylePlain) target:self action:@selector(pressRight)]; self.navigationItem.rightBarButtonItems = @[right1, right2]; [right1 release]; [right2 release]; //左侧 //self.navigationItem.leftBarButtonItem //self.navigationItem.leftBarButtonItems } - (void)pressRight { NSLog(@"%s", __FUNCTION__); } - (void)goToSecondVC { NSLog(@"%s", __FUNCTION__); //切换下一个页面 //1.创建下一个页面 SecondViewController *secondVC = [[SecondViewController alloc] init]; //2.导航控制器把下一个页面压入栈中 [self.navigationController pushViewController:secondVC animated:YES]; //3.释放 [secondVC release]; } - (void)didReceiveMemoryWarning { [super didReceiveMemoryWarning]; // Dispose of any resources that can be recreated. } @end
SecondViewController.m #import "SecondViewController.h" #import "ThirdViewController.h" @interface SecondViewController () @end @implementation SecondViewController - (void)viewDidLoad { [super viewDidLoad]; self.view.backgroundColor = [UIColor colorWithRed:0.782 green:1.000 blue:0.586 alpha:1.000]; UIButton *button = [UIButton buttonWithType:UIButtonTypeSystem]; [button setTitle:@"进入ThirdVC" forState:UIControlStateNormal]; button.frame = CGRectMake(255, 100, 100, 40); [button addTarget:self action:@selector(goToThirdVC) forControlEvents:UIControlEventTouchUpInside]; [self.view addSubview:button]; UIButton *backButton = [UIButton buttonWithType:UIButtonTypeSystem]; [backButton setTitle:@"返回FirstVC" forState:UIControlStateNormal]; backButton.frame = CGRectMake(20, 100, 100, 40); [backButton addTarget:self action:@selector(backToFirstVC) forControlEvents:UIControlEventTouchUpInside]; [self.view addSubview:backButton]; self.navigationItem.title = @"第二页"; } - (void)goToThirdVC { ThirdViewController *thirdVC = [[ThirdViewController alloc] init]; [self.navigationController pushViewController:thirdVC animated:YES]; [thirdVC release]; } - (void)backToFirstVC { //如何返回上一个页面 //让当前的视图控制器出战 [self.navigationController popViewControllerAnimated:YES]; } - (void)didReceiveMemoryWarning { [super didReceiveMemoryWarning]; // Dispose of any resources that can be recreated. } @end
ThirdViewController.m #import "ThirdViewController.h" @interface ThirdViewController () @end @implementation ThirdViewController - (void)viewDidLoad { [super viewDidLoad]; self.view.backgroundColor = [UIColor colorWithRed:0.574 green:0.981 blue:1.000 alpha:1.000]; UIButton *backButton = [UIButton buttonWithType:UIButtonTypeSystem]; [backButton setTitle:@"返回SecondVC" forState:UIControlStateNormal]; backButton.frame = CGRectMake(20, 100, 150, 40); [backButton addTarget:self action:@selector(backToScondVC) forControlEvents:UIControlEventTouchUpInside]; [self.view addSubview:backButton]; UIButton *button = [UIButton buttonWithType:UIButtonTypeSystem]; [button setTitle:@"返回FirstVC" forState:UIControlStateNormal]; button.frame = CGRectMake(375 - 170, 100, 150, 40); [button addTarget:self action:@selector(backToFirstVC) forControlEvents:UIControlEventTouchUpInside]; [self.view addSubview:button]; self.navigationItem.title = @"第三页"; } - (void)backToFirstVC { //返回第一个页面 //让当前的视图控制器出栈 [self.navigationController popToRootViewControllerAnimated:YES]; } - (void)backToScondVC { [self.navigationController popViewControllerAnimated:YES]; } - (void)didReceiveMemoryWarning { [super didReceiveMemoryWarning]; // Dispose of any resources that can be recreated. } @end
页面间传值
1.属性传值(从前往后传)
a.在后一个页面中, 根据传递的值, 写属性, 属性的类型由值的类型决定, 属性的个数由值得个数决定
b.在前一个页面中, 对属性进行赋值
c.在后一个页面中使用
2.代理传值(从后往前传)
a.在后一个页面中, 制定协议, 写delegate属性, 让代理执行方法, 把值传递过去
b.在前一个页面中, 设置代理, 遵守协议, 实现协议方法
c.在协议方法中使用传递过来的值
HomeViewController.m #import "HomeViewController.h" #import "DetailViewController.h" @interface HomeViewController ()<DetailViewControllerDelegate>{ UITextField *myText; UITextField *herText; } @end @implementation HomeViewController - (void)viewDidLoad { [super viewDidLoad]; self.view.backgroundColor = [UIColor colorWithRed:0.749 green:1.000 blue:0.713 alpha:1.000]; self.navigationItem.title = @"缘 分 测 试"; myText = [[UITextField alloc] initWithFrame:CGRectMake(80, 100, 375 - 160, 40)]; myText.borderStyle = UITextBorderStyleRoundedRect; myText.placeholder = @"请输入你的姓名"; [self.view addSubview:myText]; [myText release]; herText = [[UITextField alloc] initWithFrame:CGRectMake(80, 160, 375 - 160, 40)]; herText.borderStyle = UITextBorderStyleRoundedRect; herText.placeholder = @"请输入ta的姓名"; [self.view addSubview:herText]; [herText release]; UIButton *startButton = [UIButton buttonWithType:UIButtonTypeSystem]; startButton.frame = CGRectMake(80, 220, 375 - 160, 40); startButton.titleLabel.font = [UIFont systemFontOfSize:20]; [startButton setTitle:@"开 始 测 试" forState:UIControlStateNormal]; [startButton addTarget:self action:@selector(test) forControlEvents:UIControlEventTouchUpInside]; [self.view addSubview:startButton]; } - (void)test { if (myText.text.length == 0 || herText.text.length == 0) { //提示框 UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@"提示" message:@"姓名不能为空, 请重新输入" delegate:nil cancelButtonTitle:@"OK" otherButtonTitles: nil]; [alertView show]; [alertView release]; return; } DetailViewController *detailVC = [[DetailViewController alloc] init]; detailVC.myname = myText.text; detailVC.hername = herText.text; detailVC.delegate = self; [self.navigationController pushViewController:detailVC animated:YES]; [detailVC release]; } - (void)didReceiveMemoryWarning { [super didReceiveMemoryWarning]; // Dispose of any resources that can be recreated. } #pragma mark - DetailViewControllerDelegate - (void)passString:(NSString *)text { // NSLog(@"%@", text); self.navigationItem.title = text; } @end
DetailViewController.m #import "DetailViewController.h" @interface DetailViewController () { UITextField *textField; } @end @implementation DetailViewController - (void)dealloc { [_myname release]; [_hername release]; [super dealloc]; } - (void)viewDidLoad { [super viewDidLoad]; self.view.backgroundColor = [UIColor colorWithRed:0.801 green:1.000 blue:0.989 alpha:1.000]; self.navigationItem.title = @"测 试 结 果"; UILabel *resultLabel = [[UILabel alloc] initWithFrame:CGRectMake(20, 120, 335, 200)]; resultLabel.backgroundColor = [UIColor whiteColor]; resultLabel.numberOfLines = 0; resultLabel.text = [NSString stringWithFormat:@"%@和%@的父母就很好的朋友，%@和%@从穿开裆裤时就在一起。一起进幼儿园，一起上小学，一起过家家，一起闯祸后对家长撒谎。%@和%@是长辈默认的娃娃亲，%@和%@是邻居眼中的金童玉女，走到一起是天经地义的事。", _myname, _hername, _myname, _hername, _myname, _hername, _myname, _hername]; [self.view addSubview:resultLabel]; [resultLabel release]; textField = [[UITextField alloc] initWithFrame:CGRectMake(80, 340, 375 - 160, 40)]; textField.borderStyle = UITextBorderStyleRoundedRect; textField.placeholder = @"请输入内容"; [self.view addSubview:textField]; [textField release]; } - (void)didReceiveMemoryWarning { [super didReceiveMemoryWarning]; // Dispose of any resources that can be recreated. } - (void)viewWillDisappear:(BOOL)animated { [super viewWillDisappear:animated]; if ([_delegate respondsToSelector:@selector(passString:)]) { [_delegate passString:textField.text]; } }