iOS UITextField、UITextView只限输入中文、英文、数字及实时限制字符个数的封装实现代码

  [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(textFieldChange:) name:UITextFieldTextDidChangeNotification object:nil];  [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(textFieldChange:) name:UITextViewTextDidChangeNotification object:nil];

- (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;  }}

#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;

#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;}