导航控制器的制作，push，pop，root，index

AppDelegate.m

#import "FirstViewController.h"

@implementation AppDelegate

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
// Override point for customization after application launch.
self.window.backgroundColor = [UIColor whiteColor];
[self.window makeKeyAndVisible];

//创建视图控制器
FirstViewController *firstCtrl = [[FirstViewController alloc] init];

//创建导航控制器
UINavigationController *navCtrl = [[UINavigationController alloc] initWithRootViewController:firstCtrl];

self.window.rootViewController = navCtrl;

return YES;
}

FirstViewController.m

- (void)viewDidLoad
{
[super viewDidLoad];

//设置标题
self.title = @"第一个控制器";

self.view.backgroundColor = [UIColor grayColor];

UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect];
button.frame = CGRectMake(100, 100, 100, 40);
button.backgroundColor = [UIColor greenColor];
[button setTitle:@"push" forState:UIControlStateNormal];
[button addTarget:self action:@selector(buttonAction:) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:button];

//取得当前视图控制器的导航栏
UINavigationBar *navBar = self.navigationController.navigationBar;
//获取导航向
NSArray *items = navBar.items;
NSLog(@"firstItems:%@",items);
NSLog(@"fiestBar:%@",navBar);

}

- (void)buttonAction:(UIButton *)button
{

SecondViewController *secondCtrl = [[SecondViewController alloc] init];
//导航到下一个视图控制器
[self.navigationController pushViewController:secondCtrl animated:YES];

}

SecondViewController.m

- (void)viewDidLoad
{
[super viewDidLoad];

self.title = @"第二个控制器";

self.view.backgroundColor = [UIColor orangeColor];

UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect];
button.frame = CGRectMake(100, 100, 100, 40);
button.tag = 101;
button.backgroundColor = [UIColor greenColor];
[button setTitle:@"push" forState:UIControlStateNormal];
[button addTarget:self action:@selector(buttonAction:) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:button];

UIButton *button1 = [UIButton buttonWithType:UIButtonTypeRoundedRect];
button1.tag = 102;
button1.frame = CGRectMake(100, 180, 100, 40);
button1.backgroundColor = [UIColor greenColor];
[button1 setTitle:@"pop" forState:UIControlStateNormal];
[button1 addTarget:self action:@selector(buttonAction:) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:button1];

//打印的结果是当前对象secondctrl
//    NSLog(@"%@",self.navigationController.topViewController);
//    NSLog(@"%@",self.navigationController.visibleViewController);

//返回导航控制器的自控制器的个数
/*
"<FirstViewController: 0x93328c0>",
"<SecondViewController: 0x8f1ca00>"
*/
NSLog(@"%@",self.navigationController.viewControllers);

}

- (void)viewDidAppear:(BOOL)animated {

//取得当前视图控制器的导航栏
UINavigationBar *navBar = self.navigationController.navigationBar;

//    [navBar pushNavigationItem:<#(UINavigationItem *)#> animated:<#(BOOL)#>]

//获取导航向
NSArray *items = navBar.items;
NSLog(@"secondItems:%@",items);
NSLog(@"secondBar:%@",navBar);

[super viewDidAppear:animated];

}

- (void)buttonAction:(UIButton *)button
{
if (button.tag == 101) {
ThirdViewController *thirdCtrl = [[ThirdViewController alloc] init];
//导航到下一个视图控制器
[self.navigationController pushViewController:thirdCtrl animated:YES];
}else if (button.tag == 102) {

[self.navigationController popViewControllerAnimated:YES];
}
}

ThirdViewController.h

@interface ThirdViewController : UIViewController<UIAlertViewDelegate>

ThirdViewController.m

- (void)viewDidLoad
{
[super viewDidLoad];

self.view.backgroundColor = [UIColor redColor];

//导航控制器子控制器的数组
NSArray *viewCtrls = self.navigationController.viewControllers;

self.title = [NSString stringWithFormat:@"第%d个控制器",viewCtrls.count];

UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect];
button.frame = CGRectMake(100, 100, 100, 40);
button.tag = 101;
button.backgroundColor = [UIColor greenColor];
[button setTitle:@"push" forState:UIControlStateNormal];
[button addTarget:self action:@selector(buttonAction:) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:button];

UIButton *button1 = [UIButton buttonWithType:UIButtonTypeRoundedRect];
button1.tag = 102;
button1.frame = CGRectMake(100, 180, 100, 40);
button1.backgroundColor = [UIColor greenColor];
[button1 setTitle:@"pop" forState:UIControlStateNormal];
[button1 addTarget:self action:@selector(buttonAction:) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:button1];

UIButton *button2 = [UIButton buttonWithType:UIButtonTypeRoundedRect];
button2.tag = 103;
button2.frame = CGRectMake(100, 260, 100, 40);
button2.backgroundColor = [UIColor greenColor];
[button2 setTitle:@"root" forState:UIControlStateNormal];
[button2 addTarget:self action:@selector(buttonAction:) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:button2];

UIButton *button3 = [UIButton buttonWithType:UIButtonTypeRoundedRect];
button3.tag = 104;
button3.frame = CGRectMake(100, 340, 100, 40);
button3.backgroundColor = [UIColor greenColor];
[button3 setTitle:@"index" forState:UIControlStateNormal];
[button3 addTarget:self action:@selector(buttonAction:) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:button3];

}

- (void)buttonAction:(UIButton *)button {

if (button.tag == 101) {
<span style="color:#ff0000;"> //push</span>
ThirdViewController *thirdCtrl = [[ThirdViewController alloc] init];
[self.navigationController pushViewController:thirdCtrl animated:YES];
}else if (button.tag == 102) {

<span style="color:#ff0000;">  //pop</span>
[self.navigationController popViewControllerAnimated:YES];

}else if (button.tag == 103) {

<span style="color:#ff0000;">  //root</span>
[self.navigationController popToRootViewControllerAnimated:YES];

}else if (button.tag == 104) {
<span style="white-space:pre">	</span><pre name="code" class="objc"><span style="color:#ff0000;"><span style="white-space:pre">	</span>//index跳到指定控制器</span>

UIAlertView *alerView = [[UIAlertView alloc] initWithTitle:@"输入提示" message:@"请输入需要跳转的界面" delegate:self cancelButtonTitle:@"取消" otherButtonTitles:@"确定", nil]; //设置样式 alerView.alertViewStyle = UIAlertViewStylePlainTextInput; [alerView show];
//弹出到指定的控制器// [self.navigationController popToViewController:<#(UIViewController *)#> animated:<#(BOOL)#>] } }#pragma mark-- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex { if (buttonIndex == 1) { //获取输入的内容 UITextField
*field = [alertView textFieldAtIndex:0]; NSString *text = field.text; if (text.length != 0) { //将字符串转换成数字 int num = [text intValue]; //判断输入是否合法 if (num >= self.navigationController.viewControllers.count || num<0) { return; } //取得响应的视图控制器 UIViewController *viewCtrl
= [self.navigationController.viewControllers objectAtIndex:num-1]; [self.navigationController popToViewController:viewCtrl animated:YES]; } } }