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 ViewController
10
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 ViewController
11
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 - action
73 - (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