UI基础 导航控制器

app .m

#import "AppDelegate.h"
#import "RootViewController.h"
@interface AppDelegate ()

@end

@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];
    
    
    RootViewController * root=[[RootViewController alloc]init];
//    self.window.rootViewController=root;
    //创建导航控制器
    UINavigationController *nav =[[UINavigationController alloc]initWithRootViewController:root];
    
    //把导航控制器作为window的视图
    self.window.rootViewController =nav;
    //导航栏的颜色
    nav.navigationBar.barTintColor=[UIColor greenColor];
    
    //半透明
    nav.navigationBar.translucent=NO;
    
    
    
        
    
    
    return YES;
}

root.m

#import "RootViewController.h"
#import "SecondViewController.h"
@interface RootViewController ()

@end

@implementation RootViewController

- (void)viewDidLoad {
    [super viewDidLoad];
//    UIView *view=[[UIView alloc] initWithFrame:CGRectMake(0, 0, 100, 100)];
//
//    view.backgroundColor=[UIColor redColor];
//    [self.view addSubview:view];
//

    //把控制导航栏内容代码写到对应的页面上来
    self.navigationItem.title=@"首页";
    
//    self.navigationItem.titleView=
    //左右侧的按钮 文字
//    self.navigationItem.rightBarButtonItem=[[UIBarButtonItem alloc] initWithTitle:@"右侧" style:UIBarButtonItemStylePlain target:self action:@selector(touchRight)];
// 图片
    self.navigationItem.rightBarButtonItem=[[UIBarButtonItem alloc]initWithImage:[UIImage imageNamed:@"Processsettings"] style:UIBarButtonItemStylePlain target:self action:@selector(touchRight)];
    
    

    
}

-(void)touchRight
{
    NSLog(@"右侧");
    
    SecondViewController *second =[[SecondViewController alloc]init];
    //跳转
    [self.navigationController pushViewController:second animated:YES];
    
    
}
@end

second.m

#import "SecondViewController.h"

@interface SecondViewController ()

@end

@implementation SecondViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    self.view.backgroundColor =[UIColor greenColor];
    
//    第二个页面左上角返回按钮
    self.navigationItem.leftBarButtonItem=[[UIBarButtonItem alloc]initWithImage:[UIImage imageNamed:@"fanhui"] style:UIBarButtonItemStylePlain target:self action:@selector(goBack)];

}

-(void)goBack
{
//    从哪里回到上一个
    [self.navigationController popToRootViewControllerAnimated:YES];
    
}

@end