IOS中根据正则表达式来输入的文本框TextField,输入时自动格式化银行卡号（4位一空格）、手机号等

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网上的基本都是TextField输入完之后，验证输入内容符不符合正则表达式的，所以我要写一篇：输入的同时进行验证（不必全部输入完），直接过滤掉不符合的内容，而不是输入完才判断符不符合，是直接按照正则来展示的。

比如银行卡号：xxxx xxxx xxxx xxxx xxxx(4位一空格)

比如手机号：xxx xxxx xxx(3-4-4空格)

实现这个功能，需要引入一个开源代码WTReTextField，地址 https://github.com/pieceofsummer/WTReTextField

下载下来可以直接运行，示例有银行卡号4位一分割，日期时间的例子。

银行卡号需要设置成@"^(\\d{4}(?: )){3}\\d{4}$"

解释一下

第一步：@"^(\\d{4}(?: )){3}\\d{4}$" 中的(\\d{4}(?: ))代表4位数字加一个空格

第二步：@"^(\\d{4}(?: )){3}\\d{4}$" 中的{3}代表有三个第一步中说的

第三部：@"^(\\d{4}(?: )){3}\\d{4}$" 中的d{4}代表结尾是4个数字

但是，不能在中间输入，不能在中间删除。

直接运行的截图：

我在此基础上添加了在中间输入删除的功能。

//////  MTextField.h////  Created by mac mini on 15-4-13.////#import <UIKit/UIKit.h>@class WTReParser;@interface MTextField : UITextField{    NSString *_lastAcceptedValue;    WTReParser *_parser;}@property (strong, nonatomic) NSString *pattern;@property (strong, nonatomic) NSMutableString *lastText;////由于边输入边匹配//- (void)formatInput:(UITextField *)textField;////用于一次性变成想要展示的格式//- (void)onlyFormatInput:(UITextField *)textField;@end

//////  MTextField.m////  Created by mac mini on 15-4-13.////#import "MTextField.h"#import "WTReParser.h"@implementation MTextField- (id)initWithFrame:(CGRect)frame{    self = [super initWithFrame:frame];    if (self)    {        _lastAcceptedValue = nil;        _parser = nil;        [self addTarget:self action:@selector(formatInput:) forControlEvents:UIControlEventEditingChanged];    }    return self;}- (id)initWithCoder:(NSCoder *)aDecoder{    self = [super initWithCoder:aDecoder];    if (self)    {        _lastAcceptedValue = nil;        _parser = nil;        [self addTarget:self action:@selector(formatInput:) forControlEvents:UIControlEventEditingChanged];    }    return self;}- (void)dealloc{    _lastAcceptedValue = nil;    _parser = nil;        NSLog(@"dealloc");        [super dealloc];}- (void)setPattern:(NSString *)pattern{    if (pattern == nil || [pattern isEqualToString:@""])        _parser = nil;    else        _parser = [[WTReParser alloc] initWithPattern:pattern];}- (NSString*)pattern{    return _parser.pattern;}- (void)formatInput:(UITextField *)textField{        UITextRange *range = textField.selectedTextRange;        if (_parser == nil) return;        __block WTReParser *localParser = _parser;            dispatch_async(dispatch_get_main_queue(), ^{            //加上这行可以在中间删除增加，只是光标位置不对        textField.text = [textField.text stringByReplacingOccurrencesOfString:@" " withString:@""];                NSString *formatted = [localParser reformatString:textField.text];                if (formatted == nil){            formatted = _lastAcceptedValue;        }        else{            _lastAcceptedValue = formatted;        }        NSString *newText = formatted;                        if (![textField.text isEqualToString:newText]) {                        textField.text = formatted;                        if(_lastText){                                //                //textField.text.length >= _lastText.length是在输入                //            if (textField.text.length >= _lastText.length) {                //range4是原有字符串在新字符串的位置 ，如果长度是旧的长度，位置是0 则顺序输入 并且 光标不在最后                NSRange range4 = [textField.text rangeOfString: _lastText];                                //location是当前光标位置                UITextPosition* beginning = textField.beginningOfDocument;                UITextPosition* start = range.start;                UITextPosition* end = range.end;                const NSInteger location = [textField offsetFromPosition:beginning toPosition:start];                const NSInteger length = [textField offsetFromPosition:start toPosition:end];                                                if ((range4.length == _lastText.length) && (range4.location == 0 ) && location == textField.text.length ) {                    //                    //如果                    //                    NSLog(@"我在从前往后顺序输入");                }else{                    //还有一种在空格前面输入 输入后光标应该向后移动两位                                                            NSLog(@"我在中间插入");                    textField.selectedTextRange = range;                                                            if (formatted.length > 0 && [[formatted substringWithRange:NSMakeRange(location-1, 1)] isEqualToString:@" "]) {//                        NSLog(@"已经点击了删除，并且前面是空格，自动跳过空格");                                                UITextPosition *start2 = [self positionFromPosition:beginning offset:location + 1];                        UITextPosition *end2 = [self positionFromPosition:start offset:length + 1 ];                        textField.selectedTextRange = [self textRangeFromPosition:start2 toPosition:end2];                                            }                }            }                //                //textField.text.length< _lastText.length是在删除                //            else{                //删除 如果从后往前一个个删除 遇到空格则自动会删除2个                NSRange range3 = [_lastText rangeOfString:textField.text ];                if ((range3.length == textField.text.length) && (range3.location == 0 )) {                    NSLog(@"我在从后往前顺序删");                }else{                    NSLog(@"我在中间数字里面 或 在空格前面删");                                        UITextPosition* beginning = textField.beginningOfDocument;                    UITextPosition* start = range.start;                    UITextPosition* end = range.end;                    const NSInteger location = [textField offsetFromPosition:beginning toPosition:start];                    const NSInteger length = [textField offsetFromPosition:start toPosition:end];                                                                                textField.selectedTextRange = range;                                                            if ( [[formatted substringWithRange:NSMakeRange(location-1, 1)] isEqualToString:@" "]) {                        NSLog(@"已经点击了删除，并且前面是空格，自动跳过空格");                                                UITextPosition *start2 = [self positionFromPosition:beginning offset:location - 1];                        UITextPosition *end2 = [self positionFromPosition:start offset:length -1 ];                        textField.selectedTextRange = [self textRangeFromPosition:start2 toPosition:end2];                                            }                                    }                            }        }            [self sendActionsForControlEvents:UIControlEventValueChanged];        }        if(_lastText)            [_lastText release];        _lastText = [[NSMutableString alloc]initWithString:textField.text];                    });}- (void)onlyFormatInput:(UITextField *)textField{        //如果选的号码  再删除会崩溃    if(_lastText)        [_lastText release];    _lastText = [[NSMutableString alloc]initWithFormat:@"%@",textField.text];            if (_parser == nil) return;        __block WTReParser *localParser = _parser;        dispatch_async(dispatch_get_main_queue(), ^{        NSString *formatted = [localParser reformatString:textField.text];        if (formatted == nil)            formatted = _lastAcceptedValue;        else            _lastAcceptedValue = formatted;        NSString *newText = formatted;        if (![textField.text isEqualToString:newText]) {            textField.text = formatted;            [self sendActionsForControlEvents:UIControlEventValueChanged];        }    });}@end

demo下载地址 https://pan.baidu.com/s/1i57jmap

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