http://www.cnblogs.com/heyonggang/p/3664565.html

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本地服务器实现登陆验证功能http://www.cnblogs.com/ios8/archive/2013/11/11/ios-login-json.html 原帖链接1 #import "ViewController.h"  2   3 @interface ViewController ()  4   5 @end  6   7 @implementation ViewController  8   9 - (void)viewDidLoad 10 { 11     [super viewDidLoad]; 12     // Do any additional setup after loading the view, typically from a nib. 13      14     //三个UILabel 15     UILabel *nameLabel = [[UILabel alloc]initWithFrame:CGRectMake(10, 60, 80, 37)]; 16     nameLabel.font = [UIFont systemFontOfSize:15]; 17     nameLabel.text = @"用  户  名:"; 18     nameLabel.backgroundColor = [UIColor clearColor]; 19     nameLabel.textAlignment = NSTextAlignmentLeft; 20     nameLabel.numberOfLines = 2;  //用于设置UILabel中文本的行数 21     [self.view addSubview:nameLabel]; 22     [nameLabel release]; 23      24     UILabel *newPasswordLabel = [[UILabel alloc]initWithFrame:CGRectMake(10, 60+40, 80, 37)]; 25     newPasswordLabel.font = [UIFont systemFontOfSize:15]; 26     newPasswordLabel.text = @"密       码："; 27     newPasswordLabel.backgroundColor = [UIColor clearColor]; 28     newPasswordLabel.textAlignment = NSTextAlignmentLeft; 29     [self.view addSubview:newPasswordLabel]; 30     [newPasswordLabel release]; 31      32     UILabel *oncePasswordLabel = [[UILabel alloc]initWithFrame:CGRectMake(10, 60+40*2, 80, 37)]; 33     oncePasswordLabel.font = [UIFont systemFontOfSize:15]; 34     oncePasswordLabel.text = @"确认密码:"; 35     oncePasswordLabel.backgroundColor = [UIColor clearColor]; 36     oncePasswordLabel.textAlignment = NSTextAlignmentLeft; 37     [self.view addSubview:oncePasswordLabel]; 38     [oncePasswordLabel release]; 39      40      41     //三个输入框 42     UITextField *nameTextField = [[UITextField alloc]initWithFrame:CGRectMake(90, 60, 210, 30)]; 43     nameTextField.placeholder = @"请输入用户名"; 44     nameTextField.tag = 1; 45     [nameTextField setSecureTextEntry:NO]; 46     nameTextField.font = [UIFont systemFontOfSize:14]; 47     nameTextField.delegate = self; 48     nameTextField.backgroundColor = [UIColor clearColor]; 49     nameTextField.borderStyle = UITextBorderStyleRoundedRect; 50     [self.view addSubview:nameTextField]; 51     [nameTextField release]; 52      53     UITextField *passwordTextField = [[UITextField alloc]initWithFrame:CGRectMake(90, 60+40, 210, 30)]; 54     passwordTextField.placeholder = @"至少6位数字"; 55     passwordTextField.tag = 2; 56     [passwordTextField setSecureTextEntry:YES]; 57     passwordTextField.font = [UIFont systemFontOfSize:14]; 58     passwordTextField.delegate = self; 59     passwordTextField.backgroundColor = [UIColor clearColor]; 60     passwordTextField.borderStyle = UITextBorderStyleRoundedRect; 61     passwordTextField.keyboardType = UIKeyboardTypeNumberPad; 62     [self.view addSubview:passwordTextField]; 63     [passwordTextField release]; 64      65     UITextField *onceNewPasswordTextField = [[UITextField alloc]initWithFrame:CGRectMake(90, 60+40*2, 210, 30)]; 66     onceNewPasswordTextField.placeholder = @"请再次输入密码"; 67     onceNewPasswordTextField.tag = 3; 68     onceNewPasswordTextField.font = [UIFont systemFontOfSize:14]; 69     [onceNewPasswordTextField setSecureTextEntry:YES]; 70     onceNewPasswordTextField.delegate = self; 71     onceNewPasswordTextField.backgroundColor = [UIColor clearColor]; 72     onceNewPasswordTextField.borderStyle = UITextBorderStyleRoundedRect; 73     onceNewPasswordTextField.keyboardType = UIKeyboardTypeNumberPad; 74     [self.view addSubview:onceNewPasswordTextField]; 75     [onceNewPasswordTextField release]; 76      77      78     UIButton *confirmButton = [UIButton buttonWithType:UIButtonTypeRoundedRect]; 79     confirmButton.frame = CGRectMake(110, 60+40*3+20, 100, 37); 80     [confirmButton setTitle:@"确定" forState:UIControlStateNormal];       //正常状况下button显示的标题 81     [confirmButton setTitle:@"确定" forState:UIControlStateHighlighted];  //高亮显示时button的标题 82     confirmButton.backgroundColor = [UIColor redColor]; 83     [confirmButton addTarget:self action:@selector(confirm:) forControlEvents:UIControlEventTouchUpInside];//button被按下又抬起后发生的事件 84     //@selector可以理解为"选择子"，selector是一个指针变量，类似于sender。 这里是将method的方法指定给新建的这个confirmButton 85     [self.view addSubview:confirmButton]; 86 } 87  88 //收回键盘 遵循代理实现键盘回收功能 89 - (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event 90 { 91     for (int i = 0; i<4; i++) { 92         UITextField *textField = (UITextField*)[self.view viewWithTag:1+i]; 93         [textField resignFirstResponder]; 94     } 95 } 96  97 - (void)didReceiveMemoryWarning 98 { 99     [super didReceiveMemoryWarning];100     // Dispose of any resources that can be recreated.101 }102 103 @end
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