首先我们需要用到JSBadgeView这个第三方库，在需要用到的类文件中导入；
然后我们需要给badge绑定一个数据，用来显示数字，我采用如下方法将值暂存，在需要显示时取出来；
NSUserDefaults *pref = [NSUserDefaults standardUserDefaults];
NSString *notCount = [pref stringForKey:@"notbadge"];取出值
notice.strNoticeCount += 1;新的值
int notSum = notCount.intValue + notice.strNoticeCount;新的加上旧的
NSString *notBadge = [NSString stringWithFormat:@"%d",notSum];
[pref setValue:notBadge forKey:@"notbadge"];再存入user
然后在- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath方法中，给需要用到的cell绑定；
if (tableView.tag == 100) {
if (arrayNotice.count>0) {
if (indexPath.row == 0) {
NSString *simpleTableIdentifier = @"NoticeCell";
MessageCell *cell = [tableView dequeueReusableCellWithIdentifier:simpleTableIdentifier];
UIImageView* imageView = (UIImageView*)[cell.contentView viewWithTag:100];找不到这个tag就会新建，找到了就沿用，节省内存
if (imageView == nil) {
imageView = [[UIImageView alloc]initWithFrame:CGRectMake(leftedge, topedge, CELL_HEIGHT -5, CELL_HEIGHT-5)];这个图是类似头像的，badge就绑定在这个图上，
[imageView setTag:100];
[cell.contentView addSubview:imageView];
JSBadgeView *badgeView = [[JSBadgeView alloc] initWithParentView:imageView alignment:JSBadgeViewAlignmentTopRight];
[badgeView setTag:200];
在设置cell的方法中加上
JSBadgeView *badgeView = (JSBadgeView*) [imageView viewWithTag:200];
NSUserDefaults *pref = [NSUserDefaults standardUserDefaults];
NSString *badgeCount = [pref stringForKey:@"notbadge"];
badgeView.badgeText = badgeCount;
if ([badgeView.badgeText isEqualToString:@"0"]) {
[badgeView setHidden:YES];
}
这样就可以显示了，
当我点进去是需要清空这个值并且隐藏，由于我是用的segue所以在- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
用identifier判断
else if( [segue.identifier isEqualToString:@"openNotice"]){
NSIndexPath *indexPath = [self.tableMessage indexPathForCell:(UITableViewCell *)sender];
NoticeViewController *noticeview = segue.destinationViewController;
MessageCell *cell =(MessageCell *) [self.tableMessage cellForRowAtIndexPath:indexPath];
JSBadgeView *badgeView = (JSBadgeView*) [cell.contentView viewWithTag:200];
badgeView.badgeText = @"0";
NSUserDefaults *pref = [NSUserDefaults standardUserDefaults];
[pref setValue:0 forKey:@"notbadge"];
if ([badgeView.badgeText isEqualToString:@"0"]) {
[badgeView setHidden:YES];
}
这样就可以了，当然如果别的方法中会改变这个badge的值也需要将第一个方法中的代码写进去，删除cell时也别忘记清空这个值，
如何添加badgeview