导航控制器下自定义按钮完成界面跳转

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];

    // 初始化RootVC（rootVC为navC的根视图控制器，也就是首个被navC管理的视图控制器）
    RootViewController *rootVC = [[RootViewController alloc]init];
    // 初始化navC (初始化方法使用的是可以给navC设置根视图控制器)
    UINavigationController *navC = [[UINavigationController alloc]initWithRootViewController:rootVC];

    // 设置navigationBar的tintColor（前端渲染的颜色） 其实是navigationBar上面返回按钮的颜色
    navC.navigationBar.tintColor = [UIColor redColor];
    // 改变navigationBar的背景颜色
    // navC.navigationBar.backgroundColor = [UIColor yellowColor];
    // 改变navigationBar的透明状态（默认为半透明）
    navC.navigationBar.translucent = NO;
    // 设置背景图片
    // UIBarMetricsDefault 横、竖屏状态下的背景图片
    // UIBarMetricsCompact 横屏状态下的背景图片
    [navC.navigationBar setBackgroundImage:[UIImage imageNamed:@"1.png"] forBarMetrics:UIBarMetricsCompact];
    // 设置navigationBar的样式 (系统提供的只有两种，浅白色和黑色)
    navC.navigationBar.barStyle = UIBarStyleBlack;

    // 为window设置根视图控制器
    [self.window setRootViewController:navC];

    return YES;
    }

import "RootViewController.h"

import "SecondViewController.h"

@interface RootViewController ()

@end

@implementation RootViewController

// 视图将要出现的时候
-(void)viewWillAppear:(BOOL)animated{
[super viewWillAppear:animated];
NSLog(@"Root___%@",self.navigationController.viewControllers);
}

  • (void)viewDidLoad {
    [super viewDidLoad];

    // 设置导航栏标题
    self.navigationItem.title = @"根视图控制器";
    // 设置titleView（标题视图）
    UILabel *titleLabel = [[UILabel alloc]initWithFrame:CGRectMake(0, 0, 300, 44)];
    titleLabel.text = @"titleView";
    titleLabel.backgroundColor = [UIColor greenColor];
    titleLabel.textAlignment = NSTextAlignmentCenter;
    self.navigationItem.titleView = titleLabel;
    // 为了下个界面的返回按钮处没有文字，在已经使用titleView的情况下，可以将标题设置为空字符串
    self.navigationItem.title = @"";
    // 设置navigationBar的右按钮
    // <#(UIBarButtonSystemItem)#>:当前按钮的系统样式

    UIBarButtonItem *rightBtnItem = [[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemDone target:self action:@selector(rightBarBtnAction:)];
    // 设置右侧按钮
    self.navigationItem.rightBarButtonItem = rightBtnItem;

    UIButton *pushBtn = [UIButton buttonWithType:UIButtonTypeSystem];
    [pushBtn setTitle:@"push" forState:UIControlStateNormal];
    pushBtn.frame = CGRectMake(100, 100, 100, 100);
    [pushBtn addTarget:self action:@selector(pushAction:) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:pushBtn];
    }

// 导航栏右侧按钮回调方法
-(void)rightBarBtnAction:(UIBarButtonItem*)sender{
// push到下个界面
SecondViewController *secondVC = [[SecondViewController alloc]init];
[self.navigationController pushViewController:secondVC animated:YES];
}

// 按钮的回调方法，进入下一个界面
-(void)pushAction:(UIButton*)sender{
// 打印viewController，看一下当前被navC所管理的视图控制器们
NSArray *viewCs = self.navigationController.viewControllers;
NSLog(@"%@",viewCs);
// 进入到下一个界面（为导航控制器新添加一个要被管理的视图控制器）
SecondViewController *secondVC = [[SecondViewController alloc]init];

//  推送到下一个界面
/**
 *   pushViewController:将要显示的视图控制器
     animated:切换中是否需要动画
     push的操作，就是将所要被管理的视图控制器入栈，实际执行的动作就是：[self.navigationController.viewControllers addObjects:secondVC]在此处secondVC就会位于栈顶
     viewControllers：该属性的返回类型为NSArray，但是我们一定得记得，viewControllers实际的类型是NSMutableArray。这里体现了面向对象多态的特性
 */
[self.navigationController pushViewController:secondVC animated:YES];
NSLog(@"push*****%@",self.navigationController.viewControllers);

//  得到当前位于栈顶的视图控制器  viewControllers这个数组的最后一个元素，一般都在栈顶
NSLog(@"top____%@",self.navigationController.topViewController);

//  得到当前正在显示的视图控制器
NSLog(@"visible~~~~~~%@",self.navigationController.visibleViewController);

}

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

import "SecondViewController.h"

import "ThirdViewController.h"

@interface SecondViewController ()

@end

@implementation SecondViewController

  • (void)viewDidLoad {
    [super viewDidLoad];

    // 设置左边按钮
    UIBarButtonItem *leftBtnItem = [[UIBarButtonItem alloc]initWithTitle:@"Back" style:UIBarButtonItemStyleDone target:self action:@selector(leftBackBtnAction:)];
    self.navigationItem.leftBarButtonItem = leftBtnItem;

    UIButton *leftBtn = [UIButton buttonWithType:UIButtonTypeSystem];
    leftBtn.frame = CGRectMake(0, 0, 50, 50);
    [leftBtn setTitle:@"button" forState:UIControlStateNormal];
    // 当我们使用自定义视图（UIView及其子类）作为导航条按钮的时候，需要使用此初始化方法
    UIBarButtonItem *barItem = [[UIBarButtonItem alloc]initWithCustomView:leftBtn];

    // 定义一组左侧按钮
    self.navigationItem.leftBarButtonItems = @[barItem,leftBtnItem];

    UIButton *backBtn = [UIButton buttonWithType:UIButtonTypeSystem];
    [backBtn setFrame:CGRectMake(100, 100, 100, 100)];
    [backBtn setTitle:@"popBtn"
    forState:UIControlStateNormal];
    [backBtn addTarget:self
    action:@selector(popAction:)
    forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:backBtn];

UIButton *thirdBtn = [UIButton buttonWithType:UIButtonTypeSystem];
[thirdBtn setFrame:CGRectMake(100, 200, 100, 100)];
[thirdBtn setTitle:@"thirdBtn"
         forState:UIControlStateNormal];
[thirdBtn addTarget:self
            action:@selector(thirdAction:)
  forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:thirdBtn];

}

// 左边按钮的回调方法
-(void)leftBackBtnAction:(UIBarButtonItem*)sender{
[self.navigationController popToRootViewControllerAnimated:YES];
}

// 返回上级界面（出栈）
-(void)popAction:(UIButton*)sender{
// 出栈 实际所进行的操作是：[self.navigationController.viewControllers removeObject:self]
// 更准确的写法：[self.navigationController.viewControllers removeObject:self.navigationController.viewControllers.lastObject]
// 在出栈之前打印当前navC过管理的视图控制器
NSLog(@"pre ***%@",self.navigationController.viewControllers);
// [self.navigationController popViewControllerAnimated:YES];
// 返回到指定视图控制器
[self.navigationController popToViewController:self.navigationController.viewControllers.firstObject animated:YES];
// 出栈之后，再次打印当前navC所管理的视图控制器
NSLog(@"pop ~~~%@",self.navigationController.viewControllers);

}

// 跳转到thirdVC
-(void)thirdAction:(UIButton*)sender{

ThirdViewController *thirdVC = [[ThirdViewController alloc]init];
[self.navigationController pushViewController:thirdVC 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

import "ThirdViewController.h"

@interface ThirdViewController ()

@end

@implementation ThirdViewController

  • (void)viewDidLoad {
    [super viewDidLoad];

    UIButton *thirdBackBtn = [UIButton buttonWithType:UIButtonTypeSystem];
    [thirdBackBtn setFrame:CGRectMake(100, 200, 200, 100)];
    [thirdBackBtn setTitle:@"thirdBackRootBtn"
    forState:UIControlStateNormal];
    [thirdBackBtn addTarget:self
    action:@selector(thirdBackRootAction:)
    forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:thirdBackBtn];

}

-(void)thirdBackRootAction:(UIButton*)sender{
// 返回根视图控制器
NSLog(@"third___%@",self.navigationController.viewControllers);
[self.navigationController popToRootViewControllerAnimated:YES];
NSLog(@"thirdPop___%@",self.navigationController.viewControllers);

}

  • (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

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