1 #import "PhoneField.h"
 2 #define myNumbers          @"0123456789\n"
 3 @implementation PhoneField
 4 -(instancetype)initWithEncryptionFlag:(BOOL)EncryptionFlag
 5 {
 6     
 7     if([super init])
 8     {
 9         self.delegate=self;
10         _EncryptionFlag=EncryptionFlag;
11         self.keyboardType=UIKeyboardTypePhonePad;
12     }
13     return self;
14 }
15 
16 
17 -(instancetype)init
18 {
19     if([super init])
20     {
21         self.delegate=self;
22         self.keyboardType=UIKeyboardTypePhonePad;
23     }
24     return self;
25 }
26 /*
27 // Only override drawRect: if you perform custom drawing.
28 // An empty implementation adversely affects performance during animation.
29 - (void)drawRect:(CGRect)rect {
30 // Drawing code
31 }
32 */
33 
34 -(BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string
35 {
36     NSCharacterSet *cs;
37     
38   
39     cs = [[NSCharacterSet characterSetWithCharactersInString:myNumbers] invertedSet];
40     NSString *filtered = [[string componentsSeparatedByCharactersInSet:cs] componentsJoinedByString:@""];
41     BOOL basicTest = [string isEqualToString:filtered];
42     if (!basicTest)
43     {
44         return NO;
45     }
46     if(range.location>=11)
47     {
48         return NO;
49     }
50     if(_Changed)
51     {
52         _Changed();
53     }
54     if(_EncryptionFlag)
55     {
56         if(range.location>=3&&range.location<=6)
57         {
58             textField.text=[textField.text stringByAppendingString:@"*"];
59             
60             return NO;
61         }
62     }
63   
64     return YES;
65 }
66 /*
67 // Only override drawRect: if you perform custom drawing.
68 // An empty implementation adversely affects performance during animation.
69 - (void)drawRect:(CGRect)rect {
70     // Drawing code
71 }
72 */
73 
74 @end
75 


　　　　#使用
76     phoneField=[[PhoneField alloc] initWithEncryptionFlag:YES];
77     phoneField.clearButtonMode = UITextFieldViewModeWhileEditing;
78     phoneField.placeholder=@"请输入手机号";
79     phoneField.keyboardType=UIKeyboardTypePhonePad;
80     phoneField.returnKeyType=UIReturnKeyNext;
81     phoneField.backgroundColor=[UIColor whiteColor];
82     phoneField.delegate=self;
83     _phone=@"";
84     phoneField.Changed=^(UITextField *textField,NSRange range,NSString *string)
85     {
86         ws.phone= [ws.phone stringByAppendingString :string];
87     };