本文主要是介绍[IOS]UITextField限制字符输入，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！
[IOS]UITextField限制字符输入
DEMO地址：http://download.csdn.net/detail/u012881779/8884627
只需要输入数字的情况，可以选择输入键盘来限制输入字符；而对于只需要输入字母或只需输入数字与字母这类的情况，没法用键盘限制输入字符，于是便有了下文。。。
#import "ViewController.h"#define DEF_CARD @"1234567890Xx"
/// 只能输入数字
#define DEF_NUMBER @"1234567890"
/// 只能输入邮箱需要字符
#define DEF_MAIL @"1234567890@.abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
/// 只能输入数字、字母、汉字(即限制输入特殊字符，用这种方法虽然比较笨，但还是有优点的，当不需要限制某些特殊字符时直接去掉就OK了)
#define DEF_NUMBERCHARCHINA [self specialSymbolsAction]@interface ViewController () <UITextFieldDelegate>
@property (weak, nonatomic) IBOutlet UIScrollView *scrollView;@end@implementation ViewController#pragma mark UITextFieldDelegate
- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string{//名字if(textField.tag == 1000){NSCharacterSet *cs = [[NSCharacterSet characterSetWithCharactersInString:DEF_NUMBERCHARCHINA]invertedSet];NSString *filtered = [[string componentsSeparatedByCharactersInSet:cs] componentsJoinedByString:@""];BOOL basicTest = [string isEqualToString:filtered];if(basicTest){if([string isEqualToString:@""]){return YES;}return NO;}//电话号码 纯数字可以使用数字键盘Number Pad}else if(textField.tag == 1001){NSCharacterSet *cs = [[NSCharacterSet characterSetWithCharactersInString:DEF_NUMBER]invertedSet];NSString *filtered = [[string componentsSeparatedByCharactersInSet:cs] componentsJoinedByString:@""];BOOL basicTest = [string isEqualToString:filtered];if(!basicTest){return NO;}//身份证号}else if(textField.tag == 1002){NSCharacterSet *cs = [[NSCharacterSet characterSetWithCharactersInString:DEF_CARD]invertedSet];NSString *filtered = [[string componentsSeparatedByCharactersInSet:cs] componentsJoinedByString:@""];BOOL basicTest = [string isEqualToString:filtered];if(!basicTest){return NO;}//邮箱 使用键盘E-mail Address}else if(textField.tag == 1003){NSCharacterSet *cs = [[NSCharacterSet characterSetWithCharactersInString:DEF_MAIL]invertedSet];NSString *filtered = [[string componentsSeparatedByCharactersInSet:cs] componentsJoinedByString:@""];BOOL basicTest = [string isEqualToString:filtered];if(!basicTest){return NO;}}return YES;
}/// 完成编辑
- (void)textFieldDidEndEditing:(UITextField *)textField{NSString *fieldText = textField.text;NSString *changeField = @"";NSMutableArray *fieldArr = [[NSMutableArray alloc] init];for (int j = 0; j<fieldText.length; j++) {NSString *subStr = [fieldText substringWithRange:NSMakeRange(j, 1)];[fieldArr addObject:subStr];}for (int i = 0; i < fieldArr.count ; i ++) {NSString *string = [fieldArr objectAtIndex:i];//名字if(textField.tag == 1000){NSCharacterSet *cs = [[NSCharacterSet characterSetWithCharactersInString:DEF_NUMBERCHARCHINA]invertedSet];NSString *filtered = [[string componentsSeparatedByCharactersInSet:cs] componentsJoinedByString:@""];BOOL basicTest = [string isEqualToString:filtered];if(!basicTest){changeField = [NSString stringWithFormat:@"%@%@",changeField,string];}//电话号码}else if(textField.tag == 1001){NSCharacterSet *cs = [[NSCharacterSet characterSetWithCharactersInString:DEF_NUMBER]invertedSet];NSString *filtered = [[string componentsSeparatedByCharactersInSet:cs] componentsJoinedByString:@""];BOOL basicTest = [string isEqualToString:filtered];if(basicTest){changeField = [NSString stringWithFormat:@"%@%@",changeField,string];}//身份证号}else if(textField.tag == 1002){NSCharacterSet *cs = [[NSCharacterSet characterSetWithCharactersInString:DEF_CARD]invertedSet];NSString *filtered = [[string componentsSeparatedByCharactersInSet:cs] componentsJoinedByString:@""];BOOL basicTest = [string isEqualToString:filtered];if(basicTest){changeField = [NSString stringWithFormat:@"%@%@",changeField,string];}//邮箱}else if(textField.tag == 1003){NSCharacterSet *cs = [[NSCharacterSet characterSetWithCharactersInString:DEF_MAIL]invertedSet];NSString *filtered = [[string componentsSeparatedByCharactersInSet:cs] componentsJoinedByString:@""];BOOL basicTest = [string isEqualToString:filtered];if(basicTest){changeField = [NSString stringWithFormat:@"%@%@",changeField,string];}}}textField.text = changeField;
}/// 特殊符号
- (NSString *)specialSymbolsAction{//数学符号NSString *matSym = @" ﹢﹣×÷±/=≌∽≦≧≒﹤﹥≈≡≠=≤≥<>≮≯∷∶∫∮∝∞∧∨∑∏∪∩∈∵∴⊥∥∠⌒⊙√∟⊿㏒㏑%‰⅟½⅓⅕⅙⅛⅔⅖⅚⅜¾⅗⅝⅞⅘≂≃≄≅≆≇≈≉≊≋≌≍≎≏≐≑≒≓≔≕≖≗≘≙≚≛≜≝≞≟≠≡≢≣≤≥≦≧≨≩⊰⊱⋛⋚∫∬∭∮∯∰∱∲∳%℅‰‱øØπ";//标点符号NSString *punSym = @"。，、＇：∶；?‘’“”〝〞ˆˇ﹕︰﹔﹖﹑·¨….¸;！´？！～—ˉ｜‖＂〃｀@﹫¡¿﹏﹋﹌︴々﹟#﹩$﹠&﹪%*﹡﹢﹦﹤‐￣¯―﹨ˆ˜﹍﹎+=<＿_-ˇ~﹉﹊（）〈〉‹›﹛﹜『』〖〗［］《》〔〕{}「」【】︵︷︿︹︽_﹁﹃︻︶︸﹀︺︾ˉ﹂﹄︼❝❞!():,'[]｛｝^・.·．•＃＾＊＋＝＼＜＞＆§⋯`－–／—|\"\\";//单位符号＊·NSString *unitSym = @"°′″＄￥〒￠￡％＠℃℉﹩﹪‰﹫㎡㏕㎜㎝㎞㏎m³㎎㎏㏄º○¤%$º¹²³";//货币符号NSString *curSym = @"₽€£Ұ₴$₰¢₤¥₳₲₪₵元₣₱฿¤₡₮₭₩ރ円₢₥₫₦zł﷼₠₧₯₨Kčर₹ƒ₸￠";//制表符NSString *tabSym = @"─ ━│┃╌╍╎╏┄ ┅┆┇┈ ┉┊┋┌┍┎┏┐┑┒┓└ ┕┖┗ ┘┙┚┛├┝┞┟┠┡┢┣ ┤┥┦┧┨┩┪┫┬ ┭ ┮ ┯ ┰ ┱ ┲ ┳ ┴ ┵ ┶ ┷ ┸ ┹ ┺ ┻┼ ┽ ┾ ┿ ╀ ╁ ╂ ╃ ╄ ╅ ╆ ╇ ╈ ╉ ╊ ╋ ╪ ╫ ╬═║╒╓╔ ╕╖╗╘╙╚ ╛╜╝╞╟╠ ╡╢╣╤ ╥ ╦ ╧ ╨ ╩ ╳╔ ╗╝╚ ╬ ═ ╓ ╩ ┠ ┨┯ ┷┏ ┓┗ ┛┳ ⊥ ﹃ ﹄┌ ╮ ╭ ╯╰";return [NSString stringWithFormat:@"%@%@%@%@%@",matSym,punSym,unitSym,curSym,tabSym];
}/**常用符号大全*特殊符号 编号序号 数学符号 爱心符号 标点符号 单位符号 货币符号 箭头符号 符号图案 希腊字母 俄语字母*汉语拼音 中文字符 日语字符 制表符 皇冠符号*//*//特殊符号♠♣♧♡♥❤❥❣♂♀✲☀☼☾☽◐◑☺☻☎☏✿❀№↑↓←→√×÷★℃℉°◆◇⊙■□△▽¿½☯✡㍿卍卐♂♀✚〓㎡♪♫♩♬㊚㊛囍㊒㊖Φ♀♂‖$@*&#※卍卐Ψ♫♬♭♩♪♯♮⌒¶∮‖€￡¥$//编号序号①②③④⑤⑥⑦⑧⑨⑩⑪⑫⑬⑭⑮⑯⑰⑱⑲⑳⓪❶❷❸❹❺❻❼❽❾❿⓫⓬⓭⓮⓯⓰⓱⓲⓳⓴㊀㊁㊂㊃㊄㊅㊆㊇㊈㊉㈠㈡㈢㈣㈤㈥㈦㈧㈨㈩⑴⑵⑶⑷⑸⑹⑺⑻⑼⑽⑾⑿⒀⒁⒂⒃⒄⒅⒆⒇⒈⒉⒊⒋⒌⒍⒎⒏⒐⒑⒒⒓⒔⒕⒖⒗⒘⒙⒚⒛ⅠⅡⅢⅣⅤⅥⅦⅧⅨⅩⅪⅫⅰⅱⅲⅳⅴⅵⅶⅷⅸⅹⒶⒷⒸⒹⒺⒻⒼⒽⒾⒿⓀⓁⓂⓃⓄⓅⓆⓇⓈⓉⓊⓋⓌⓍⓎⓏⓐⓑⓒⓓⓔⓕⓖⓗⓘⓙⓚⓛⓜⓝⓞⓟⓠⓡⓢⓣⓤⓥⓦⓧⓨⓩ⒜⒝⒞⒟⒠⒡⒢⒣⒤⒥⒦⒧⒨⒩⒪⒫⒬⒭⒮⒯⒰⒱⒲⒳⒴⒵//数学符号﹢﹣×÷±/=≌∽≦≧≒﹤﹥≈≡≠=≤≥<>≮≯∷∶∫∮∝∞∧∨∑∏∪∩∈∵∴⊥∥∠⌒⊙√∟⊿㏒㏑%‰⅟½⅓⅕⅙⅛⅔⅖⅚⅜¾⅗⅝⅞⅘≂≃≄≅≆≇≈≉≊≋≌≍≎≏≐≑≒≓≔≕≖≗≘≙≚≛≜≝≞≟≠≡≢≣≤≥≦≧≨≩⊰⊱⋛⋚∫∬∭∮∯∰∱∲∳%℅‰‱øØπ//爱心符号♥❣ღ♠♡♤❤❥//标点符号。，、＇：∶；?‘’“”〝〞ˆˇ﹕︰﹔﹖﹑·¨….¸;！´？！～—ˉ｜‖＂〃｀@﹫¡¿﹏﹋﹌︴々﹟#﹩$﹠&﹪%*﹡﹢﹦﹤‐￣¯―﹨ˆ˜﹍﹎+=<＿_-ˇ~﹉﹊（）〈〉‹›﹛﹜『』〖〗［］《》〔〕{}「」【】︵︷︿︹︽_﹁﹃︻︶︸﹀︺︾ˉ﹂﹄︼❝❞!():,'[]｛｝^・.·．•＃＾＊＋＝＼＜＞＆§⋯`－–／—|\"\\//单位符号°′″＄￥〒￠￡％＠℃℉﹩﹪‰﹫㎡㏕㎜㎝㎞㏎m³㎎㎏㏄º○¤%$º¹²³//货币符号₽€£Ұ₴$₰¢₤¥₳₲₪₵元₣₱฿¤₡₮₭₩ރ円₢₥₫₦zł﷼₠₧₯₨Kčर₹ƒ₸￠//箭头符号
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