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UINavigationController 相关知识总结
在"NavigationAppDelegate.m"文件中：包含"FirstViewController.h"头文件
在-(BOOL)application:(UIApplication*)application didFinishLaunchingWithOptions:(NSDictionary*)launchOptions
{
self.window = [[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]] autorelease];
FirstViewController* firstViewController = [[[FirstViewController alloc] initWithNibName:@"FirstViewController" bundle:nil] autorelease];
self.navigationController = [[[UINavigationController alloc] initWithRootViewController:firstViewController] autorelease];
self.window.rootViewController = self.navigationController;
[self.window makeKeyAndVisible];
return YES;
}
运行程序，会发现有一个导航栏
然后在"FirstViewController.m"文件中，包含"SecondViewController.h"头文件
-(void)viewDidLoad
{
[super viewDidLoad];
//采用自定义按钮的方法，给导航栏定义一个右侧按钮
UIButton* button = [UIButton buttonWithType:UIButtonTypeRoundedRect];
button.frame = CGRectMake(0,0,60,40);
[button setTitle:@"exchange" forState:UIControlStateNormal];
[button addTarget:self action:@selector(exchange:) forControlEvents:UIControlEventTouchUpInside];
UIBarButtonItem* right = [[[UIBarButtonItem alloc] initWithCustomView:button] autorelease];
self.navigationItem.rightBarButtonItem = right;
//采用系统方法，给导航栏增加一个左侧按钮
UIBarButtonItem* left = [[[UIBarButtonItem alloc] initWithTitle:@"left" style:UIBarButtonItemStyleDone target:@selector(left:)] autorelease];
self.navigationItem.leftBarButtonItem = left;
//给当前视图的导航栏设置标题
self.navigationItem.title = @"一级视图";
}
-(void)exchange:(id)sender //单击定义导航栏右侧的按钮，进入到下一个视图。
{
SecondViewController* secondViewController = [[[SecondViewController alloc] initWithNibName:@"SecondViewController" bundle:nil] autorelease];
[self.navigationController pushViewController:secondViewController animated:YES];
}
然后在"SecondViewController.m"文件中，包含"ThirdViewController.h"头文件
- (void)viewDidLoad
{
[super viewDidLoad];
//定义一个右侧按钮
UIBarButtonItem* rightButton = [[[UIBarButtonItem alloc] initWithTitle:@"next" style:UIBarButtonItemStyleDone target:@selector(next:)] autorelease];
self.navigationItem.rightBarButtonItem = rightButton;
}
- (void)next:(id)sender //单击定义二级视图右侧的按钮，进入到三级视图。
{
ThirdViewController* thirdViewController = [[[ThirdViewController alloc] initWithNibName:@"ThirdViewController" bundle:nil] autorelease];
[self.navigationController pushViewController:thirdViewController animated:YES];
}
然后在文件"ThirdViewController.h"中，使用xib定义四个按钮，分别对应下面四个方法
- (void)push:(id)sender //单击此按钮，进入到下一个视图
{
ThirdViewController* thirdViewController = [[[ThirdViewController alloc] initWithNibName:@"ThirdViewController" bundle:nil] autorelease];
[self.navigationController pushViewController:thirdViewController animated:YES];
}
- (void)pop:(id)sender //单击此按钮，返回到上一个视图
{
[self.navigationController popViewControllerAnimated:YES];
}
- (void)popToRoot:(id)sender //单击此按钮，返回到根视图界面
{
[self.navigationController popToRootViewControllerAnimated:YES];
}
- (void)popToIndex:(id)sender //返回到指定位置的视图
{
[self.navigationController popToViewController:[self.navigationController.viewControllers objectAtIndex:1] animated:YES]; //返回到第一个视图界面
}
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