UITableView

//创建vc

RootViewController *rootVC = [[RootViewController alloc]init];

//根视图

self.window.rootViewController = rootVC;

#pragma mark - 初始化

-(instancetype)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil{

self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];

if (self) {

NSLog(@"初始化");

}

return self;

}

#pragma mark - 加载视图

-(void)loadView{

//重写时 一定要写super

//loadView方法 负责创建self.view

[super loadView];

NSLog(@"加载视图");

}

#pragma mark - 视图已经加载

- (void)viewDidLoad {

[super viewDidLoad];

NSLog(@"视图已经加载");

// Do any additional setup after loading the view.

self.view.backgroundColor = [UIColor lightGrayColor];

//UI导航控制器

//创建VC

ViewController *root = [[ViewController alloc] init];

//导航控制器: 管理控制器的控制器

//创建导航

UINavigationController *navi = [[UINavigationController alloc]initWithRootViewController:root];

//把导航设置为根视图

self.window.rootViewController = navi;

//导航栏设置:controller(栏)/item(栏上的元素)

//导航栏显示/隐藏

self.navigationController.navigationBarHidden = NO/YES;

//栏样式

self.navigationController.navigationBar.barStyle = UIBarStyleBlack;

//半透明效果

//开启效果时 屏幕左上角为坐标原点

//关闭时 导航栏的左下角为坐标原点

self.navigationController.navigationBar.translucent = YES;

//栏背景颜色

self.navigationController.navigationBar.backgroundColor = [UIColor yellowColor];

//栏颜色

self.navigationController.navigationBar.barTintColor = [UIColor blackColor];

//栏标题

//    self.title = @"这是一个标题 ";

self.navigationItem.title = @"Back";

//分段

UISegmentedControl *seg = [[[UISegmentedControl alloc]initWithItems:@[@"消息",@"电话"]] autorelease];

seg.frame = CGRectMake(0, 0, 100, 30);

//栏标题视图

self.navigationItem.titleView = seg;

//栏左侧按钮

self.navigationItem.leftBarButtonItem = [[[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemCamera target:self action:@selector(left:)] autorelease];

//栏右按钮

//系统按钮样式

UIBarButtonItem *b1 = [[[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemTrash target:self action:@selector(right1)] autorelease];

//自定义按钮图片

UIBarButtonItem *b2 = [[[UIBarButtonItem alloc] initWithImage:[UIImage imageNamed:@"gift.png"] style:UIBarButtonItemStylePlain target:self action:@selector(right2)] autorelease];

self.navigationItem.rightBarButtonItems = @[b1,b2];

//修改导航栏上内容的颜色

self.navigationController.navigationBar.tintColor = [UIColor whiteColor];

//跳转页面

UIButton *btn = [UIButton buttonWithType:UIButtonTypeSystem];

btn.frame = CGRectMake(200, 200, 100, 100);

btn.backgroundColor = [UIColor yellowColor];

[self.view addSubview:btn];

[btn addTarget:self action:@selector(goTwo) forControlEvents:UIControlEventTouchUpInside];

#pragma mark - 跳转页面

-(void)goTwo{

//1.获取第二页面对象

TwoViewController *twoVC = [[TwoViewController alloc] init];

//2.跳转(由导航控制器 从当前push到第二页)

[self.navigationController pushViewController:twoVC animated:YES];

//3.内存管理

[twoVC release];

}

//UI页面间传值

#warning 属性1: 在第二页声明一个属性 用来保存数据

@property(nonatomic,copy)NSString *string;

#warning 属性2: 在push页面之前传值(创建对象之后 push之前)

twoVC.string = self.tf1.text;

#warning 属性3: 通过属性给当前页内容赋值

self.tf2.text = self.string;

#warning 协议1: 声明协议(定义一个带参数的方法)

@protocol PassDelegate

#warning 协议2: 定义代理人属性

@property(nonatomic,assign)iddelegate;

#warning 协议3: 返回上一页之前 让代理人调用协议方法

[self.delegate passValue:self.tf2.text];

[self.navigationController popViewControllerAnimated:YES];

#warning 协议4: 签协议

@interface RootViewController ()

#warning 协议5: 设置代理人

//为了保证设置代理人的对象和push的对象是一个 在创建push对象之前 设置delegate.

twoVC.delegate = self;

[self.navigationController pushViewController:twoVC animated:YES];

[twoVC release];

}

#warning 协议6: 实现协议方法

-(void)passValue:(NSString *)string{

//把收到的string 赋值给输入框

self.tf1.text = string;

}