//1、账号标签

    UILabel *idLalel = [[UILabel alloc] initWithFrame:CGRectMake(30, 100, 70, 30)];

    //2、设置?文本控制相关的属性

    idLalel.text = @"账号：";

    [self addSubview:idLalel];

    [idLalel release];

    //1、密码标签

    UILabel *passLalel = [[UILabel alloc] initWithFrame:CGRectMake(30, 200, 70, 30)];

    //2、设置?文本控制相关的属性

    passLalel.text = @"密码：";

    [self addSubview:passLalel];

    [passLalel release];

    //账号输入框

    UITextField *idTexfield = [[UITextField alloc] initWithFrame:CGRectMake(100, 100, 160, 30)];

    //设置边界属性

    idTexfield.tag = 1001;

    idTexfield.borderStyle = UITextBorderStyleBezel;

    idTexfield.placeholder = @"请输入账号...";

    idTexfield.delegate = self;

    [self addSubview:idTexfield];

    [idTexfield release];

    //密码输入框

    UITextField *passTexfield = [[UITextField alloc] initWithFrame:CGRectMake(100, 200, 160, 30)];

    //设置边界属性

    passTexfield.tag = 1002;

    passTexfield.borderStyle = UITextBorderStyleBezel;

    passTexfield.secureTextEntry = YES;   //以圆点形式输入

    passTexfield.keyboardType =  UIKeyboardTypeNumberPad;//键盘形式

    passTexfield.returnKeyType = UIReturnKeyNext;

    passTexfield.placeholder = @"请输入密码...";

    passTexfield.delegate = self;

    [self addSubview:passTexfield];

    [passTexfield release];

    //放置按钮

    //登录

    UIButton *loginButton = [UIButton buttonWithType:UIButtonTypeSystem];

    loginButton.frame = CGRectMake(30, 250, 60, 30);

    [loginButton setTitle:@"登录" forState:UIControlStateNormal];

    //添加事件

    [loginButton addTarget:self action:@selector(loginAction:)

          forControlEvents:UIControlEventTouchUpInside];

    [self addSubview:loginButton];

    //注册

    UIButton *registerButton = [UIButton buttonWithType:UIButtonTypeSystem];

    registerButton.frame = CGRectMake(120, 250, 60, 30);

    [registerButton setTitle:@"注册" forState:UIControlStateNormal];

    // [loginButton addTarget:self action:@selector(login:)

    //       forControlEvents:UIControlEventTouchUpInside];

    [self addSubview:registerButton];

    //密码找回

    UIButton *regetButton = [UIButton buttonWithType:UIButtonTypeSystem];

    regetButton.frame = CGRectMake(220, 250, 60, 30);

    [regetButton setTitle:@"密码找回" forState:UIControlStateNormal];

    // [loginButton addTarget:self action:@selector(login:)

    //       forControlEvents:UIControlEventTouchUpInside];

    [self addSubview:regetButton];

登录 ，注册 界面实现 代码