059在屏幕中显示一个文本输入框

效果如下：

ViewController.h

1 #import <UIKit/UIKit.h>
2
3 @interface ViewController : UIViewController
4 @property (strong, nonatomic) UITextField *txtFMessage;
5
6 @end

ViewController.m

 1 #import "ViewController.h"
 2
 3 @interface ViewController ()
 4 - (void)hideKeyboard:(id)sender;
 5 @end
 6
 7 @implementation ViewController
 8
 9 - (void)viewDidLoad {
10     [super viewDidLoad];
11
12     _txtFMessage = [[UITextField alloc] initWithFrame:CGRectMake(0, 0, 260, 30)];
13     _txtFMessage.center = self.view.center;
14     _txtFMessage.borderStyle = UITextBorderStyleRoundedRect;
15     _txtFMessage.contentVerticalAlignment = UIControlContentVerticalAlignmentCenter;
16     _txtFMessage.placeholder = @"请输入信息";
17     [self.view addSubview:_txtFMessage];
18
19     UITapGestureRecognizer *tapGestureRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(hideKeyboard:)];
20     [self.view addGestureRecognizer:tapGestureRecognizer];
21 }
22
23 - (void)didReceiveMemoryWarning {
24     [super didReceiveMemoryWarning];
25     // Dispose of any resources that can be recreated.
26 }
27
28 /**
29  *  隐藏键盘
30  *
31  *  @param sender 事件触发者
32  */
33 - (void)hideKeyboard:(id)sender {
34     NSLog(@"Tap Gesture Recognizer，去掉某些控件作为第一响应器");
35     [_txtFMessage resignFirstResponder];
36 }
37
38 @end