062在文本输入框中设置一个清空按钮

效果如下：

ViewController.h

1 #import <UIKit/UIKit.h>

2 

3 @interface ViewController : UIViewController<UITextFieldDelegate>

4 @property (strong, nonatomic) NSMutableArray *mArrTextField;

5 

6 @end

ViewController.m

 1 #import "ViewController.h"

 2 

 3 @interface ViewController ()

 4 - (void)layoutUI;

 5 - (UITextField *)newTextField:(UITextFieldViewMode)clearButtonMode frame:(CGRect)rect;

 6 - (void)hideKeyboard:(id)sender;

 7 @end

 8 

 9 @implementation ViewController

10 - (void)viewDidLoad {

11     [super viewDidLoad];

12     

13     [self layoutUI];

14     

15     UITapGestureRecognizer *tapGestureRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(hideKeyboard:)];

16     [self.view addGestureRecognizer:tapGestureRecognizer];

17 }

18 

19 - (void)didReceiveMemoryWarning {

20     [super didReceiveMemoryWarning];

21     // Dispose of any resources that can be recreated.

22 }

23 

24 #pragma mark - Private Methods

25 /**

26  *  隐藏键盘

27  *

28  *  @param sender 事件触发者

29  */

30 - (void)hideKeyboard:(id)sender {

31     NSLog(@"Tap Gesture Recognizer，去掉某些控件作为第一响应器");

32     for (UITextField *txtF in _mArrTextField) {

33         [txtF resignFirstResponder];

34     }

35 }

36 

37 - (void)layoutUI {

38     _mArrTextField = [[NSMutableArray alloc] initWithCapacity:4];

39     

40     CGRect rectTemp = CGRectMake(20, 40, 320, 40);

41     UITextField *txtFTemp = [self newTextField:UITextFieldViewModeNever frame:rectTemp];

42     [self.view addSubview:txtFTemp];

43     [_mArrTextField addObject:txtFTemp];

44     

45     rectTemp.origin.y += 50;

46     txtFTemp = [self newTextField:UITextFieldViewModeWhileEditing frame:rectTemp];

47     [self.view addSubview:txtFTemp];

48     [_mArrTextField addObject:txtFTemp];

49     

50     rectTemp.origin.y += 50;

51     txtFTemp = [self newTextField:UITextFieldViewModeUnlessEditing frame:rectTemp];

52     [self.view addSubview:txtFTemp];

53     [_mArrTextField addObject:txtFTemp];

54     

55     rectTemp.origin.y += 50;

56     txtFTemp = [self newTextField:UITextFieldViewModeAlways frame:rectTemp];

57     [self.view addSubview:txtFTemp];

58     [_mArrTextField addObject:txtFTemp];

59 }

60 

61 - (UITextField *)newTextField:(UITextFieldViewMode)clearButtonMode frame:(CGRect)rect {

62     UITextField *txtFMessage = [[UITextField alloc] initWithFrame:rect];

63     txtFMessage.textAlignment = NSTextAlignmentLeft;

64     txtFMessage.textColor = [UIColor colorWithRed:0.433 green:0.829 blue:1.000 alpha:1.000];

65     txtFMessage.borderStyle = UITextBorderStyleRoundedRect;

66     

67     txtFMessage.delegate = self;

68     txtFMessage.clearButtonMode = clearButtonMode;

69     switch (clearButtonMode) {

70         case UITextFieldViewModeNever:

71             txtFMessage.text = @"UITextFieldViewModeNever"; //不显示清空按钮；默认值

72             break;

73         case UITextFieldViewModeWhileEditing:

74             txtFMessage.text = @"UITextFieldViewModeWhileEditing";  //文本内容不为空时，且在编辑状态（即获得焦点）时显示清空按钮

75             break;

76         case UITextFieldViewModeUnlessEditing:

77             txtFMessage.text = @"UITextFieldViewModeUnlessEditing";  //文本内容不为空时，且不在编辑状态（即失去焦点）时显示清空按钮

78             break;

79         case UITextFieldViewModeAlways:

80             txtFMessage.text = @"UITextFieldViewModeAlways"; //文本内容不为空时，获得焦点与失去焦点都显示清空按钮

81             break;

82     }

83     return txtFMessage;

84 }

85 

86 #pragma mark - TextField

87 - (BOOL)textFieldShouldClear:(UITextField *)textField {

88     NSLog(@"textFieldShouldClear: %@", textField.text); //记录清空按钮触发清空的文本内容；例如：UITextFieldViewModeWhileEditing

89     return YES;

90 }

91 

92 @end