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
5、不能输入空格
一、注册通知
[[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
- (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
#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
#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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