1 @interface ViewController ()<UITextFieldDelegate>2 {3     NSString    *previousTextFieldContent;4     UITextRange *previousSelection;5 }6 @end

1 - (void)viewDidLoad2 {3     [super viewDidLoad];4     // Do any additional setup after loading the view, typically from a nib.5     self.textField.delegate = self;6     [self.textField addTarget:self action:@selector(formatPhoneNumber:) forControlEvents:UIControlEventEditingChanged];7 }

  1 - (void)formatPhoneNumber:(UITextField*)textField  2 {  3     NSUInteger targetCursorPosition =  4     [textField offsetFromPosition:textField.beginningOfDocument  5                        toPosition:textField.selectedTextRange.start];  6     NSLog(@"targetCursorPosition:%li", (long)targetCursorPosition);  7     // nStr表示不带空格的号码  8     NSString* nStr = [textField.text stringByReplacingOccurrencesOfString:@" " withString:@""];  9     NSString* preTxt = [previousTextFieldContent stringByReplacingOccurrencesOfString:@" " 10                                                                            withString:@""]; 11      12     char editFlag = 0;// 正在执行删除操作时为0，否则为1 13      14     if (nStr.length <= preTxt.length) { 15         editFlag = 0; 16     } 17     else { 18         editFlag = 1; 19     } 20      21     // textField设置text 22     if (nStr.length > 11) 23     { 24         textField.text = previousTextFieldContent; 25         textField.selectedTextRange = previousSelection; 26         return; 27     } 28      29     // 空格 30     NSString* spaceStr = @" "; 31      32     NSMutableString* mStrTemp = [NSMutableString new]; 33     int spaceCount = 0; 34     if (nStr.length < 3 && nStr.length > -1) 35     { 36         spaceCount = 0; 37     }else if (nStr.length < 7 && nStr.length >2) 38     { 39         spaceCount = 1; 40          41     }else if (nStr.length < 12 && nStr.length > 6) 42     { 43         spaceCount = 2; 44     } 45      46     for (int i = 0; i < spaceCount; i++) 47     { 48         if (i == 0) { 49             [mStrTemp appendFormat:@"%@%@", [nStr substringWithRange:NSMakeRange(0, 3)], spaceStr]; 50         }else if (i == 1) 51         { 52             [mStrTemp appendFormat:@"%@%@", [nStr substringWithRange:NSMakeRange(3, 4)], spaceStr]; 53         }else if (i == 2) 54         { 55             [mStrTemp appendFormat:@"%@%@", [nStr substringWithRange:NSMakeRange(7, 4)], spaceStr]; 56         } 57     } 58      59     if (nStr.length == 11) 60     { 61         [mStrTemp appendFormat:@"%@%@", [nStr substringWithRange:NSMakeRange(7, 4)], spaceStr]; 62     } 63      64     if (nStr.length < 4) 65     { 66         [mStrTemp appendString:[nStr substringWithRange:NSMakeRange(nStr.length-nStr.length % 3, 67                                                                     nStr.length % 3)]]; 68     }else if(nStr.length > 3) 69     { 70         NSString *str = [nStr substringFromIndex:3]; 71         [mStrTemp appendString:[str substringWithRange:NSMakeRange(str.length-str.length % 4, 72                                                                    str.length % 4)]]; 73         if (nStr.length == 11) 74         { 75             [mStrTemp deleteCharactersInRange:NSMakeRange(13, 1)]; 76         } 77     } 78     NSLog(@"=======mstrTemp=%@",mStrTemp); 79      80     textField.text = mStrTemp; 81     // textField设置selectedTextRange 82     NSUInteger curTargetCursorPosition = targetCursorPosition;// 当前光标的偏移位置 83     if (editFlag == 0) 84     { 85         //删除 86         if (targetCursorPosition == 9 || targetCursorPosition == 4) 87         { 88             curTargetCursorPosition = targetCursorPosition - 1; 89         } 90     } 91     else { 92         //添加 93         if (nStr.length == 8 || nStr.length == 3) 94         { 95             curTargetCursorPosition = targetCursorPosition + 1; 96         } 97     } 98  99     UITextPosition *targetPosition = [textField positionFromPosition:[textField beginningOfDocument]100                                                               offset:curTargetCursorPosition];101     [textField setSelectedTextRange:[textField textRangeFromPosition:targetPosition102                                                          toPosition :targetPosition]];103 }104 105 - (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string106 {107     previousTextFieldContent = textField.text;108     previousSelection = textField.selectedTextRange;109     110     return YES;111 }