1 @interface ViewController () 2 @property (weak, nonatomic) IBOutlet UITextField *qqField; 3 @property (weak, nonatomic) IBOutlet UITextField *pwdField; 4  5 - (IBAction)login; 6  7 @end 8  9 @implementation ViewController10 11 - (void)viewDidLoad {12     [super viewDidLoad];13     // Do any additional setup after loading the view, typically from a nib.14 }15 16 - (void)didReceiveMemoryWarning {17     [super didReceiveMemoryWarning];18     // Dispose of any resources that can be recreated.19 }20 21 - (IBAction)login {22     NSLog(@"%@ - %@", self.qqField.text, self.pwdField.text);23 }24 @end

 1 @interface ViewController () 2  3 - (void) addLabel; 4 - (void) addTextField; 5 - (void) addLoginButton; 6 - (void) login; 7  8 @end 9 10 @implementation ViewController11 12 - (void)viewDidLoad {13     [super viewDidLoad];14     // Do any additional setup after loading the view, typically from a nib.15    16     [self addLabel];17     [self addTextField];18     [self addLoginButton];19 }20 21 - (void)didReceiveMemoryWarning {22     [super didReceiveMemoryWarning];23     // Dispose of any resources that can be recreated.24 }25 26 - (void) addLabel {27     UILabel *titleLabel = [[UILabel alloc] initWithFrame:CGRectMake(0, 45, self.view.frame.size.width, 21)];28     [titleLabel setTextAlignment:NSTextAlignmentCenter];29     titleLabel.text = @"QQ登陆界面2";30     [self.view addSubview:titleLabel];31    32     UILabel *qqLabel = [[UILabel alloc] initWithFrame:CGRectMake(60, 91, 26, 21)];33     qqLabel.text = @"QQ";34     [self.view addSubview:qqLabel];35    36     UILabel *pwdLabel = [[UILabel alloc] initWithFrame:CGRectMake(60, 131, 34, 21)];37     pwdLabel.text = @"密码";38     [self.view addSubview:pwdLabel];39 }40 41 - (void) addTextField {42     UITextField *qqField = [[UITextField alloc] initWithFrame:CGRectMake(109, 87, 151, 30)];43     qqField.placeholder = @"请输入QQ账号";44     [qqField setClearButtonMode:UITextFieldViewModeWhileEditing];45     [qqField setKeyboardType:UIKeyboardTypeNumberPad];46     [qqField setBorderStyle:UITextBorderStyleRoundedRect];47     [qqField setTag:1];48     [self.view addSubview:qqField];49    50     UITextField *pwdField = [[UITextField alloc] initWithFrame:CGRectMake(109, 127, 151, 30)];51     pwdField.placeholder = @"请输入QQ密码";52     [pwdField setSecureTextEntry:YES];53     [pwdField setKeyboardType:UIKeyboardTypeNumbersAndPunctuation];54     [pwdField setClearButtonMode:UITextFieldViewModeWhileEditing];55     [pwdField setBorderStyle:UITextBorderStyleRoundedRect];56     [pwdField setTag:2];57     [self.view addSubview:pwdField];58 }59 60 - (void) addLoginButton {61     // 注意如果使用UIButtonTypeCustom，默认背景色和titleColor都是是白色，显示不出来62     UIButton *loginButton = [UIButton buttonWithType:UIButtonTypeSystem];63    64     CGRect loginRect = CGRectMake(145, 177, 30, 30);65     loginButton.frame = loginRect;66     [loginButton setTitle:@"登陆" forState:UIControlStateNormal];67     [loginButton addTarget:self action:@selector(login) forControlEvents:UIControlEventTouchUpInside];68    69     [self.view addSubview:loginButton];70 }71 72 #pragma mark - action73 - (void) login {74     UITextField *qqField = [self.view viewWithTag:1];75     UITextField *pwdField = [self.view viewWithTag:2];76    77     NSLog(@"登陆---->%@ - %@", qqField.text, pwdField.text);78 }79 @end