ios 限制字符方法

---调用

NSUIntegercharLen = [selflenghtWithString:self.name_Tf.text];

--方法

- (NSUInteger)lenghtWithString:(NSString*)string

{

NSUIntegerlen = string.length;

//汉字字符集

NSString* pattern=@"[\u4e00-\u9fa5]";

NSRegularExpression*regex = [NSRegularExpressionregularExpressionWithPattern:patternoptions:NSRegularExpressionCaseInsensitiveerror:nil];

//计算中文字符的个数

NSIntegernumMatch = [regexnumberOfMatchesInString:stringoptions:NSMatchingReportProgressrange:NSMakeRange(0, len)];

returnlen + numMatch;

}