引言需求：（输入框限制输入多少字符）
1、一个字母、符号、数字相当于一个字符
2、一个汉字相当于两个字符
3、不能输入特殊字符
4、不能输入emoji表情
直接上代码
一、注册通知
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[[nsnotificationcenter defaultcenter] addobserver:self selector:@selector(textfieldchange:) name:uitextfieldtextdidchangenotification object:nil];[[nsnotificationcenter defaultcenter] addobserver:self selector:@selector(textfieldchange:) name:uitextviewtextdidchangenotification object:nil]; |
二、通知实现
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- (void)textfieldchange:(uitextfield *)textfield{ //判断输入(不能输入特殊字符) [restrictioninput restrictioninputtextfield:self.titletextfield maxnumber:100 showview:self showerrormessage:@"商品名称0~100字符~"]; [restrictioninput restrictioninputtextview:self.infotextview maxnumber:200 showview:self showerrormessage:@"商品描述0~200字符~"];}- (bool)textview:(uitextview *)textview shouldchangetextinrange:(nsrange)range replacementtext:(nsstring *)text{ if ([restrictioninput isinputruleandblank:text] || [text isequaltostring:@""]) {//当输入符合规则和退格键时允许改变输入框 return yes; } else { return no; }}- (bool)textfield:(uitextfield *)textfield shouldchangecharactersinrange:(nsrange)range replacementstring:(nsstring *)string{ if ([restrictioninput isinputruleandblank:string] || [string isequaltostring:@""]) {//当输入符合规则和退格键时允许改变输入框 return yes; } else { return no; }} |
三、封装类（restrictioninput）
.h
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#import <foundation/foundation.h>@interface restrictioninput : nsobject+ (void)restrictioninputtextfield:(uitextfield *)inputclass maxnumber:(nsinteger)maxnumber showview:(uiview *)showview showerrormessage:(nsstring *)errormessage;+ (void)restrictioninputtextview:(uitextview *)inputclass maxnumber:(nsinteger)maxnumber showview:(uiview *)showview showerrormessage:(nsstring *)errormessage;+ (bool)isinputruleandblank:(nsstring *)str; |
.m
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#import "restrictioninput.h"@implementation restrictioninput+ (void)restrictioninputtextfield:(uitextfield *)inputclass maxnumber:(nsinteger)maxnumber showview:(uiview *)showview showerrormessage:(nsstring *)errormessage{ nsstring *tobestring = inputclass.text; if (![self isinputruleandblank:tobestring]) { inputclass.text = [self disable_emoji:tobestring]; return; } nsstring *lang = [[inputclass textinputmode] primarylanguage]; // 获取当前键盘输入模式 if([lang isequaltostring:@"zh-hans"]) { //简体中文输入,第三方输入法（搜狗）所有模式下都会显示“zh-hans” uitextrange *selectedrange = [inputclass markedtextrange]; //获取高亮部分 uitextposition *position = [inputclass positionfromposition:selectedrange.start offset:0]; //没有高亮选择的字，则对已输入的文字进行字数统计和限制 if(!position) { nsstring *getstr = [self getsubstring:tobestring maxnumber:maxnumber]; if(getstr && getstr.length > 0) { inputclass.text = getstr; [showview showhudtext:errormessage hidedelay:1.0 completionblock:nil]; nslog(@"%@", inputclass.text); } } } else{ nsstring *getstr = [self getsubstring:tobestring maxnumber:maxnumber]; if(getstr && getstr.length > 0) { inputclass.text= getstr; [showview showhudtext:errormessage hidedelay:1.0 completionblock:nil]; nslog(@"%@",inputclass.text); } }}+ (void)restrictioninputtextview:(uitextview *)inputclass maxnumber:(nsinteger)maxnumber showview:(uiview *)showview showerrormessage:(nsstring *)errormessage{ nsstring *tobestring = inputclass.text; if (![self isinputruleandblank:tobestring]) { inputclass.text = [self disable_emoji:tobestring]; return; } nsstring *lang = [[inputclass textinputmode] primarylanguage]; // 获取当前键盘输入模式 if([lang isequaltostring:@"zh-hans"]) { //简体中文输入,第三方输入法（搜狗）所有模式下都会显示“zh-hans” uitextrange *selectedrange = [inputclass markedtextrange]; //获取高亮部分 uitextposition *position = [inputclass positionfromposition:selectedrange.start offset:0]; //没有高亮选择的字，则对已输入的文字进行字数统计和限制 if(!position) { nsstring *getstr = [self getsubstring:tobestring maxnumber:maxnumber]; if(getstr && getstr.length > 0) { inputclass.text = getstr; [showview showhudtext:errormessage hidedelay:1.0 completionblock:nil]; nslog(@"%@", inputclass.text); } } } else{ nsstring *getstr = [self getsubstring:tobestring maxnumber:maxnumber]; if(getstr && getstr.length > 0) { inputclass.text= getstr; [showview showhudtext:errormessage hidedelay:1.0 completionblock:nil]; nslog(@"%@",inputclass.text); } }}/** * 获得 kmaxlength长度的字符 */+ (nsstring *)getsubstring:(nsstring*)string maxnumber:(nsinteger)maxnumber{ nsstringencoding encoding = cfstringconvertencodingtonsstringencoding(kcfstringencodinggb_18030_2000); nsdata* data = [string datausingencoding:encoding]; nsinteger length = [data length]; if (length > maxnumber) { nsdata *data1 = [data subdatawithrange:nsmakerange(0, maxnumber)]; nsstring *content = [[nsstring alloc] initwithdata:data1 encoding:encoding];//【注意4】：当截取kmaxlength长度字符时把中文字符截断返回的content会是nil if (!content || content.length == 0) { data1 = [data subdatawithrange:nsmakerange(0, maxnumber - 1)]; content = [[nsstring alloc] initwithdata:data1 encoding:encoding]; } return content; } return nil;}/** * 字母、数字、中文正则判断（不包括空格） */+ (bool)isinputrulenotblank:(nsstring *)str { nsstring *pattern = @"^[➋➌➍➎➏➐➑➒\a-za-z\u4e00-\u9fa5\\d]*$"; nspredicate *pred = [nspredicate predicatewithformat:@"self matches %@", pattern]; bool ismatch = [pred evaluatewithobject:str]; return ismatch;}/** * 字母、数字、中文正则判断（包括空格）【注意3】 */+ (bool)isinputruleandblank:(nsstring *)str { //九宫格无法输入解决需要加上正则 \➋➌➍➎➏➐➑➒ nsstring *pattern = @"^[➋➌➍➎➏➐➑➒\a-za-z\u4e00-\u9fa5\\d\\s]*$"; nspredicate *pred = [nspredicate predicatewithformat:@"self matches %@", pattern]; bool ismatch = [pred evaluatewithobject:str]; return ismatch;}+ (nsstring *)disable_emoji:(nsstring *)text{ nsregularexpression *regex = [nsregularexpression regularexpressionwithpattern:@"[^\\u0020-\\u007e\\u00a0-\\u00be\\u2e80-\\ua4cf\\uf900-\\ufaff\\ufe30-\\ufe4f\\uff00-\\uffef\\u0080-\\u009f\\u2000-\\u201f\r\n]"options:nsregularexpressioncaseinsensitive error:nil]; nsstring *modifiedstring = [regex stringbyreplacingmatchesinstring:text options:0 range:nsmakerange(0, [text length]) withtemplate:@""]; return modifiedstring;} |
以上所述是小编给大家介绍的ios uitextfield、uitextview只限输入中文、英文、数字及实时限制字符个数封装实现，希望对大家有所帮助，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对服务器之家网站的支持！
原文链接：http://blog.csdn.net/yj_sail/article/details/53928940
