UISearchBar 限制特殊字符和长度

限制特殊字符时需要注意九宫格输入问题

- (BOOL)searchBar:(UISearchBar *)searchBar shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text
{
    NSString *newString = [searchBar.text stringByReplacingCharactersInRange:range withString:text];
    // 区分九宫格
    NSString *other = @"➋➌➍➎➏➐➑➒";

    if ([newString isEqualToString:@" "]||([self hasIllegalCharacter:text]&&!([other rangeOfString:text].location != NSNotFound))) {
        
        return NO;
    }
    if (newString.length>20) {
     [[UPOCHudUtils shareInstance] toggleMessage:@"最多输入20个字符"];

        return NO;
    }
    return YES;
}

- (void)searchBarSearchButtonClicked:(UISearchBar*)searchBar{
    NSString * text =searchBar.text;
    self.searchBar.text = text;
    if (text != nil || [text length] > 0) {
        if ([text length] < 2) {
            //判断是否是中文
            if ([NSStringVerify isChinese:text] ) {
                [[UPOCHudUtils shareInstance] toggleMessage:@"请输入完整的老师姓名"];
                return;
            }
            [[UPOCHudUtils shareInstance] toggleMessage:@"至少输入两个字符"];

            return;
        }
    
    }else
    {
    }
}
//正则匹配
- (BOOL)hasIllegalCharacter:(NSString *)content {
    
    //提示标签不能输入特殊字符
    
    if ([content containsString:@"\n"]||[content isEqualToString:@""]) {
        
        return NO;
    }
    NSString *str =@"^[A-Za-z0-9\\u4e00-\u9fa5]+$";
    
    NSPredicate* emailTest = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", str];
    
    if (![emailTest evaluateWithObject:content]) {
        
        return YES;
        
    }
    
    return NO;
  
  
}
//中文
+ (BOOL)isChinese:(NSString *)string
{
    NSString *match = @"(^[\u4e00-\u9fa5]+$)";
    NSPredicate *predicate = [NSPredicate predicateWithFormat:@"SELF matches %@", match];
    return [predicate evaluateWithObject:string];
}