私自身の解決策を作りました:
@property (retain, nonatomic) MBProgressHUD *letterBar;
@property (retain, nonatomic) NSTimer *letterBarTimer;
self.letterBar = [[MBProgressHUD alloc] initWithView:self.view];
[self.letterBar setUserInteractionEnabled:NO];
[self.letterBar setMode:MBProgressHUDModeText];
[self.view addSubview:self.letterBar];
-(NSInteger)tableView:(UITableView *)tableView sectionForSectionIndexTitle:(NSString *)title atIndex:(NSInteger)index {
[self.letterBarTimer invalidate];
[self.letterBar setLabelText:title];
[self.letterBar show:YES];
self.letterBarTimer = [NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:@selector(hideLetterBar) userInfo:nil repeats:NO];
return index;
}
-(void)hideLetterBar {
[self.letterBar hide:YES];
}