TextFiled输入中文限制字符数量

- (void)textFieldDidChange:(UITextField *)textField{

UITextRange *selectedRange = textField.markedTextRange;

UITextPosition *position = [textField positionFromPosition:selectedRange.start offset:0];

if (!position) {

// 没有高亮选择的字

// 1. 过滤非汉字、字母、数字字符

self.textField.text = [self filterCharactor:textField.text withRegex:@"[^a-zA-Z0-9\u4e00-\u9fa5]"];

// 2. 截取

if (self.textField.text.length >= 12) {

self.textField.text = [self.textField.text substringToIndex:12];

}

} else {

// 有高亮选择的字 不做任何操作

}

}

// 过滤字符串中的非汉字、字母、数字

- (NSString *)filterCharactor:(NSString *)string withRegex:(NSString *)regexStr{

NSString *filterText = string;

NSError *error = NULL;

NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:regexStr options:NSRegularExpressionCaseInsensitive error:&error];

NSString *result = [regex stringByReplacingMatchesInString:filterText options:NSMatchingReportCompletion range:NSMakeRange(0, filterText.length) withTemplate:@""];

return result;

}

来自：http://www.jianshu.com/p/bda5e198260f

來源：简书