在提交数据发送网络请求，由于用户输入了emoji表情，服务端返回系统异常，体验感很差。为了解决服务器不能验证emoji编码的问题，需要在本地进行emoji的输入控制（一般情况应该由服务器在数据库中添加emoji对应的转码表以支持客户端发送emoji表情）。
所以就有了这个需求：在TextField或者TextView中，限制输入任何表情符号，（包括系统自带的表情，第三方键盘带的表情，还有某些汉字类型的表情）。
利用下面这个方法stringContainsEmoji可以限制系统键盘自带的表情
/*** 判断字符串中是否存在emoji* @param string 字符串* @return YES(含有表情)*/- (BOOL)stringContainsEmoji:(NSString *)string {__block BOOL returnValue = NO;[string enumerateSubstringsInRange:NSMakeRange(0, [string length]) options:NSStringEnumerationByComposedCharacterSequences usingBlock:^(NSString *substring, NSRange substringRange, NSRange enclosingRange, BOOL *stop) {const unichar hs = [substring characterAtIndex:0];// surrogate pairif (0xd800 <= hs && hs <= 0xdbff) {if (substring.length > 1) {const unichar ls = [substring characterAtIndex:1];const int uc = ((hs - 0xd800) * 0x400) + (ls - 0xdc00) + 0x10000;if (0x1d000 <= uc && uc <= 0x1f77f) {returnValue = YES;}}} else if (substring.length > 1) {const unichar ls = [substring characterAtIndex:1];if (ls == 0x20e3) {returnValue = YES;}} else {// non surrogateif (0x2100 <= hs && hs <= 0x27ff) {returnValue = YES;} else if (0x2B05 <= hs && hs <= 0x2b07) {returnValue = YES;} else if (0x2934 <= hs && hs <= 0x2935) {returnValue = YES;} else if (0x3297 <= hs && hs <= 0x3299) {returnValue = YES;} else if (hs == 0xa9 || hs == 0xae || hs == 0x303d || hs == 0x3030 || hs == 0x2b55 || hs == 0x2b1c || hs == 0x2b1b || hs == 0x2b50) {returnValue = YES;}}}];return returnValue;}
利用下面这个方法hasEmoji可以限制第三方键盘（常用的是搜狗键盘）的表情
/*** 判断字符串中是否存在emoji* @param string 字符串* @return YES(含有表情)*/- (BOOL)hasEmoji:(NSString*)string;{NSString *pattern = @"[^\\u0020-\\u007E\\u00A0-\\u00BE\\u2E80-\\uA4CF\\uF900-\\uFAFF\\uFE30-\\uFE4F\\uFF00-\\uFFEF\\u0080-\\u009F\\u2000-\\u201f\r\n]";NSPredicate *pred = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", pattern];BOOL isMatch = [pred evaluateWithObject:string];return isMatch;}
利用下面这个方法hasEmoji可以限制第三方键盘（常用的是搜狗键盘）的表情
/*** 判断字符串中是否存在emoji* @param string 字符串* @return YES(含有表情)*/- (BOOL)hasEmoji:(NSString*)string;{NSString *pattern = @"[^\\u0020-\\u007E\\u00A0-\\u00BE\\u2E80-\\uA4CF\\uF900-\\uFAFF\\uFE30-\\uFE4F\\uFF00-\\uFFEF\\u0080-\\u009F\\u2000-\\u201f\r\n]";NSPredicate *pred = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", pattern];BOOL isMatch = [pred evaluateWithObject:string];return isMatch;}
利用下面这个方法isNineKeyBoard可以判断当前是不是在使用九宫格输入
/**判断是不是九宫格@param string 输入的字符@return YES(是九宫格拼音键盘)*/-(BOOL)isNineKeyBoard:(NSString *)string{NSString *other = @"➋➌➍➎➏➐➑➒";int len = (int)string.length;for(int i=0;i<len;i++){if(!([other rangeOfString:string].location != NSNotFound))return NO;}return YES;}
下面就是现在UITextView禁止输入表情的重要代码，记得遵守代理~
#pragma mark -------UITextViewDelegate-(BOOL) textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text{if ([textView isFirstResponder]) {if ([[[textView textInputMode] primaryLanguage] isEqualToString:@"emoji"] || ![[textView textInputMode] primaryLanguage]) {return NO;}//判断键盘是不是九宫格键盘if ([self isNineKeyBoard:text] ){return YES;}else{if ([self hasEmoji:text] || [GeneralMethods stringContainsEmoji:text]){return NO;}}}return YES;}
UITextField在下面这个方法中写就行
#pragma mark -----UITextFieldDelegate- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string{}
另外附上几个有用的方法：
//-----过滤字符串中的emoji- (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:textoptions:0range:NSMakeRange(0, [text length])withTemplate:@""];return modifiedString;}
/*** 判断 字母、数字、中文*/- (BOOL)isInputRuleAndNumber:(NSString *)str{NSString *other = @"➋➌➍➎➏➐➑➒";//九宫格的输入值unsigned long len=str.length;for(int i=0;i<len;i++){unichar a=[str characterAtIndex:i];if(!((isalpha(a))||(isalnum(a))// ||((a=='_') || (a == '-')) //判断是否允许下划线，昵称可能会用上||((a==' ')) //判断是否允许空格||((a >= 0x4e00 && a <= 0x9fa6))||([other rangeOfString:str].location != NSNotFound)))return NO;}return YES;}
注意：上面这种方法可以限制键盘输入任何表情符号，但是如果需求是必须要输入表情，而且要下次服务器把这个表情返回，还要回显到页面上，就要看下面这篇文章
链接：/p/2f5bb0a419fa
