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- (void)jumpToClass:(int)cIndex pageIndex:(int)pIndex {
  
    UIActivityIndicatorView *indicator = [[UIActivityIndicatorView alloc]initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhiteLarge];
    //trick to store pIndex and cIndex
    int calc = cIndex*100;
    calc = calc + pIndex;
    indicator.tag = calc; //trick to store pIndex
    [self.view addSubview:indicator];
    [indicator bringSubviewToFront:self.view];
    [indicator startAnimating];
    
    [NSTimer scheduledTimerWithTimeInterval:0.01
                                     target:self
                                   selector:@selector(asyncJumpToClass:)
                                   userInfo:indicator
                                    repeats:NO];
    
}
- (void)asyncJumpToClass:(NSTimer*)theTimer {
    
    UIActivityIndicatorView *ind = (UIActivityIndicatorView *)[theTimer userInfo];
    int pIndex = ind.tag%100;
    int cIndex = ind.tag/100;
// еще 30 строк кода
}
                                    
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