.AppDelegate.m

   #import “OneViewController.h”

   //一打开就运行的

   -(BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions

   {

       self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen]bounds]];

       OneViewController *oneController = [[OneViewController alloc] init];

       [self.window setRootViewController:oneController];

      [self.window makeKeyAndVisible];

      return YES;

  }

  .OneViewController.m

  #import “TwoViewController.h”

  -(void)viewDidLoad

  {

  [super viewDidLoad];

  self.view.backgroundColor = [UIColor orangeColor];

  [self OneButton];

  }

  //添加button

  #pragma mark – Button

  -(void)OneButton

  {

      UIButton *myButton = [[UIButton alloc] init];

      myButton.frame = CGRectMake(,300,90,35);

      myButton.backgroundColor = [UIColor grayColor];

      [myButton setTitle:”确定” forState:UIControlStateNormal];

      [self.view.addSubview:myButton];

  //addSubview: 添加一个视图对接收者的子视图列表。

      [myButton addTarget:self action:@selector(ClickMyButton) forControlEvents:UIControlEventTouchUpInside];

  //addTarget: 将目标对象和动作方法与控制关联。

  }

  //Button点击事件

  #pragma mark - Button

  -(void)ClickButton

  {

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

      //跳转到下一页面

  　　[self presentViewController:two animated:YES completion:nil];

  }

  //跳转到上一页面

  [self dismissViewControllerAnimated:YES completion:nil];

  .Label

  [self label1];

  -(void)Label

  {

      UILabel *label1 = [[UILabel alloc] initWithFrame:CGRectMake(,,,)];

      label1.backgroundColor = [UIColor whiteColor];

      label1.text = @”显示”;

      label1.textColor = [UIColor blackColor];

      [self.view addSubview:label1];

  }

  .TextField

  [self _text];

  -(void)TextField

  {

      _text = [[UITextField alloc] initWithFrame:CGRectMake(,,,)];

      _text.borderStyle = UITextBorderStyleRoundedRect;

      _text.backgroundColor = [UIColor whiteColor];

      _text.placeholder = @”请输入密码”;

      _text.textColor = [UIColor blackColor];

      _text.keyboardType = UIKeyboardTypeDefault;

      _text.returnKeyType = UIReturnKeyGo;

      [self.view addSubview:_text];

  }