UITextField

 1 @synthesize textField = _textField;
 2 
 3 
 4 - (void)viewDidLoad {
 5     [super viewDidLoad];
 6     
 7     self.textField = [[UITextField alloc]init];
 8     
 9     self.textField.frame = CGRectMake(100, 100, 180, 40);
10     
11     self.textField.text = @"UserName";
12     
13     self.textField.font = [UIFont systemFontOfSize:15];
14     
15     self.textField.textColor = [UIColor blackColor];
16     
17     //边框风格
18     self.textField.borderStyle = UITextBorderStyleBezel;
19     
20     //设置虚拟键盘风格
21     //self.textField.keyboardType = UIKeyboardTypeDefault;
22     
23     self.textField.keyboardType = UIKeyboardTypeNumberPad;
24     
25     
26     //设置文字提示信息，默认浅灰色,当文本框内什么都没有才显示
27     self.textField.placeholder = @"Input username";
28     
29     //是否作为密码输入
30     self.textField.secureTextEntry = YES;
31 
32     [self.view addSubview:self.textField];
33 }
34 
35 //在屏幕空白处点击
36 -(void) touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event
37 {
38     //不再作为消息的第一响应者
39     [self.textField resignFirstResponder];
40 }

@interface ViewController : UIViewController<UIAlertViewDelegate>
{

    UITextField* _textField;
}

//属性定义
@property(retain,nonatomic) UITextField* textField;