在输入框中输入手机号码/电话号码/银行卡号/身份证号时经常需要格式化显示, 用户体验更好.

网上解决方法很多,找了不少但也是不太适合,于是把其中一些修改成以下方法, 在UITextField的分类中添加过滤,浸入性小,耦合性小,用起来还是很方便的.间隔符号可以自定义,过滤条件也可以自己增加和修改, 如只能输入数字和X(身份证号)等限制.

直接上代码:

UITextField的分类:

UITextField+Extension.h

#import <UIKit/UIKit.h>
// 准许输入字符类型
typedef NS_ENUM(NSInteger, CharsType) {CharsType_numeral = 1,      // 只许数字CharsType_letter,           // 只许大小写字母CharsType_numeralAndXx,     // 只许数字加上X和xCharsType_numeralAndLetter, // 只许数字加上大小写字母CharsType_allChar,          // 允许输入所有字符
};@interface UITextField (Extension)/***  格式化输入的文字**  @param textField 正在输入的textField*  @param range     输入字符的位置*  @param string    输入的字符*  @param CharType  准许输入字符类型*  @param maxLength 限制输入文字的最大长度*  @param indexs    插入分隔符的位置下标数组*  @param separator 插入的分隔符号**  @return 是否加显示到textField输入框内*/
+ (BOOL)textField:(UITextField *)textField range:(NSRange)range string:(NSString *)string CharType:(CharsType)CharType maxLength:(NSInteger)maxLength separatorIndexs:(NSArray *)indexs separator:(NSString *)separator;@end

UITextField+Extension.m

#import "UITextField+Extension.h"@implementation UITextField (Extension)+ (BOOL)textField:(UITextField *)textField range:(NSRange)range string:(NSString *)string CharType:(CharsType)CharType maxLength:(NSInteger)maxLength separatorIndexs:(NSArray *)indexs separator:(NSString *)separator {if ([string isEqualToString:separator]) return NO;// 添加限制条件,只能输入这个字符串内的字符NSString *allowChar;switch (CharType) {case CharsType_numeral:allowChar = @"0123456789\b";break;case CharsType_letter:allowChar = @"qwertyuiopasdfghjklzxcvbnmQWERTYUIOPASDFGHJKLZXCVBNM\b";break;case CharsType_numeralAndXx:allowChar = @"0123456789Xx\b";break;case CharsType_numeralAndLetter:allowChar = @"0123456789qwertyuiopasdfghjklzxcvbnmQWERTYUIOPASDFGHJKLZXCVBNM\b";break;default:break;}NSCharacterSet *characterSet;if (CharType != CharsType_allChar) {characterSet = [NSCharacterSet characterSetWithCharactersInString:allowChar];string = [string stringByReplacingOccurrencesOfString:separator withString:@""];if ([string rangeOfCharacterFromSet:[characterSet invertedSet]].location != NSNotFound) {return NO;}}NSString *text = textField.text;if ([string isEqualToString:@""]){if (range.length == 1) {if (range.location == text.length - 1) {if ([[text substringFromIndex:text.length -1] isEqualToString:separator]) {[textField deleteBackward];}return YES;}else {NSInteger offset = range.location;if (range.location < text.length && [[text substringFromIndex:range.location] isEqualToString:separator] && [textField.selectedTextRange isEmpty]) {[textField deleteBackward];offset --;}[textField deleteBackward];textField.text = [self parseString:textField.text separatorIndexs:indexs separator:separator];UITextPosition *newPos = [textField positionFromPosition:textField.beginningOfDocument offset:offset];textField.selectedTextRange = [textField textRangeFromPosition:newPos toPosition:newPos];return NO;}}else if (range.length > 1) {BOOL isLast = NO;if(range.location + range.length == textField.text.length ){isLast = YES;}[textField deleteBackward];textField.text = [self parseString:textField.text separatorIndexs:indexs separator:separator];__block NSInteger offset = range.location;[indexs enumerateObjectsUsingBlock:^(id  _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) {NSInteger index = [obj integerValue];if (range.location == index) offset++;}];if (isLast) {} else {UITextPosition *newPos = [textField positionFromPosition:textField.beginningOfDocument offset:offset];textField.selectedTextRange = [textField textRangeFromPosition:newPos toPosition:newPos];}return NO;}else {return YES;}}else if (string.length > 0) {NSString *str;if (CharType != CharsType_allChar) {str = [textField.text stringByTrimmingCharactersInSet:[characterSet invertedSet]];}str = [textField.text stringByReplacingOccurrencesOfString:separator withString:@""];if ((str.length + string.length - range.length > maxLength) ) {return NO;}[textField insertText:string];textField.text = [self parseString:textField.text separatorIndexs:indexs separator:separator];__block NSInteger offset = range.location + string.length;[indexs enumerateObjectsUsingBlock:^(id  _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) {NSInteger index = [obj integerValue];if (range.location == index) offset++;}];UITextPosition *newPos = [textField positionFromPosition:textField.beginningOfDocument offset:offset];textField.selectedTextRange = [textField textRangeFromPosition:newPos toPosition:newPos];return NO;} else {return YES;}
}+ (NSString *)parseString:(NSString*)string separatorIndexs:(NSArray *)indexs separator:(NSString *)separator {if (!string) return nil;NSMutableString *mStr = [NSMutableString stringWithString:[string stringByReplacingOccurrencesOfString:separator withString:@""]];[indexs enumerateObjectsUsingBlock:^(id  _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) {NSInteger index = [obj integerValue];if (mStr.length > index) [mStr insertString:separator atIndex:index];}];return  mStr;
}@end

使用:

#import "ViewController.h"
#import "UITextField+Extension.h"@interface ViewController () <UITextFieldDelegate>
@property (weak, nonatomic) IBOutlet UITextField *tf_phone;
@property (weak, nonatomic) IBOutlet UITextField *tf_idCard;
@end@implementation ViewController- (void)viewDidLoad {[super viewDidLoad];_tf_phone.delegate = self;_tf_idCard.delegate = self;
}- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string {if (textField == _tf_phone) {return [UITextField textField:textField range:range string:string CharType:CharsType_numeral maxLength:11 separatorIndexs:@[@(3), @(8)] separator:@"-"];} else if (textField == _tf_idCard) {return [UITextField textField:textField range:range string:string CharType:CharsType_numeralAndXx maxLength:18 separatorIndexs:@[@(6), @(11), @(16)] separator:@" "];}return YES;
}@end