IOS开发－UI学习－UINavigationController（导航控制器）的使用

UINavigationController是IOS 中常用的功能，基本用法如下：

1、在AppDelegate.m中添加如下代码：

#import "AppDelegate.h"
#import "MainViewController.h"

@interface AppDelegate ()

@end

@implementation AppDelegate


- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
   
    
//   注意：如果保留storyboard中的viewcontroller的话，就不用第16行到20行的创建window的语句
    
//    创建window，设置背景色
    self.window = [[UIWindow alloc]initWithFrame:[UIScreen mainScreen].bounds];
    self.window.backgroundColor = [UIColor colorWithRed:0.638 green:0.876 blue:1.000 alpha:1.000];
//    让当前window称为主窗口
    [self.window makeKeyAndVisible];
    
    
    
    
//    设置window的根视图
    MainViewController *mainVC = [[MainViewController alloc]init];
    
//    设置导航控制器的根视图为mainviewcontroller类的实例mainVC
    UINavigationController *nav = [[UINavigationController alloc]initWithRootViewController:mainVC];
    
//    设置window的根视图为nav
    self.window.rootViewController = nav;
    
    
//    给导航栏着色
    nav.navigationBar.barTintColor = [UIColor colorWithRed:1.000 green:0.400 blue:1.000 alpha:1.000];
    
//    给导航栏添加图片
    [nav.navigationBar setBackgroundImage:[UIImage imageNamed:@"barimage"] forBarMetrics:UIBarMetricsDefault];
    
    
    
    
    return YES;
}

注意：使用以上功能时先在Main.storyboard中删除viewcontroller，然后添加十六到二十行语句，如果不删除Main.storyboard中的viewcontroller的话，就不需要使用十六到二十行多语句来添加window。

新建MainViewController类，继承自UIViewController，然后在MainViewController.m中添加以下代码：

#import "MainViewController.h"
#import "FirstViewController.h"
@interface MainViewController ()

@end

@implementation MainViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    
//    设置标题
//    self.navigationItem.title = @"微信";
    
//    设置按钮
    UIButton *btn1 = [[UIButton alloc]initWithFrame:CGRectMake(100, 100, 100, 100)];
    btn1.backgroundColor = [UIColor redColor];
    [btn1 addTarget:self action:@selector(gotofirst) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:btn1];
    
    
//    自定义标题（按钮、可点击）
    UIButton *titlebtn = [UIButton buttonWithType:UIButtonTypeCustom];
    titlebtn.frame = CGRectMake(0, 0, 100, 44);
    [titlebtn setTitle:@"我可以点击" forState: UIControlStateNormal];
    [titlebtn setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];
    titlebtn.titleLabel.font = [UIFont systemFontOfSize:16];
    [titlebtn addTarget:self action:@selector(titlebtnAction) forControlEvents:UIControlEventTouchUpInside];
    self.navigationItem.titleView = titlebtn;
    
    
//    自定义左、右按键
    UIBarButtonItem *leftItem = [[UIBarButtonItem alloc]initWithTitle:@"左边" style:UIBarButtonItemStylePlain target:self action:@selector(leftItemAction)];
    
    UIBarButtonItem *rightItem = [[UIBarButtonItem alloc]initWithTitle:@"右边" style:UIBarButtonItemStylePlain target:self action:@selector(rightItemAction)];
    
//    self.navigationItem.leftBarButtonItem = leftItem;
//    self.navigationItem.rightBarButtonItem = rightItem;
    
//    使用数组给右边添加多个按钮
    self.navigationItem.rightBarButtonItems = @[leftItem,rightItem];
    
    
    
    

}

-(void)rightItemAction{
     NSLog(@"右边按钮被点击了");
}


-(void)leftItemAction{
    NSLog(@"左边按钮被点击了");
}

-(void)gotofirst{
    FirstViewController *firstVC = [[FirstViewController alloc]init];
    [self.navigationController pushViewController:firstVC animated:YES];
    
}
-(void)titlebtnAction{
    NSLog(@"我被点击了");
}



- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

/*
#pragma mark - Navigation

// In a storyboard-based application, you will often want to do a little preparation before navigation
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
    // Get the new view controller using [segue destinationViewController].
    // Pass the selected object to the new view controller.
}
*/

@end

新建FirstViewController类，然后在FirstViewController.m中添加以下代码：

#import "FirstViewController.h"
#import "MainViewController.h"

@interface FirstViewController ()

@end

@implementation FirstViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    
    self.view.backgroundColor = [UIColor blackColor];
    
    
    
    //    设置按钮
    UIButton *btn1 = [[UIButton alloc]initWithFrame:CGRectMake(100, 100, 100, 100)];
    btn1.backgroundColor = [UIColor redColor];
    [btn1 addTarget:self action:@selector(goback) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:btn1];
}


-(void)goback{
    
//按指定返回
////    返回根视图
//    [self.navigationController popToRootViewControllerAnimated:YES];
//    
////    返回上一个视图
//    [self.navigationController popViewControllerAnimated:YES];
    
    
    
//通过循环比较返回
    for (UIViewController *tmp in self.navigationController.viewControllers) {
        if ([tmp isKindOfClass:[MainViewController class]]) {
            [self.navigationController popToViewController:tmp animated:YES];
        }
    }
    
    
}


- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

/*
#pragma mark - Navigation

// In a storyboard-based application, you will often want to do a little preparation before navigation
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
    // Get the new view controller using [segue destinationViewController].
    // Pass the selected object to the new view controller.
}
*/

@end

通过以上代码就可以实现两个viewcontroller的切换，是通过导航控制器实现的。