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];
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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;
}
}
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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;
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.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;
}
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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快网idc网站的支持！
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