cell动效

-(void)tableView:(UITableView *)tableView willDisplayCell:(UITableViewCell *)cell forRowAtIndexPath:(NSIndexPath *)indexPath{
    
    id obj = self.dataSource[indexPath.row];
    if ([obj isKindOfClass:[TagModel class]]) {
        TagModel * model = obj;
        if (model.hasDisplayed) {
            return;
        }
        model.hasDisplayed = YES;
        CATransform3D rotation;
        rotation = CATransform3DMakeScale(0.2, 0.2, 0.2);
        rotation.m34 = 1.0/ -600;
        cell.layer.shadowColor = [[UIColor blackColor]CGColor];
        cell.layer.shadowOffset = CGSizeMake(10, 10);
        cell.alpha = 0;
        cell.layer.transform = rotation;
        
        [UIView beginAnimations:@"rotation" context:NULL];
        [UIView setAnimationDuration:0.4];
        cell.layer.transform = CATransform3DIdentity;
        cell.alpha = 1;
        cell.layer.shadowOffset = CGSizeMake(0, 0);
        [UIView commitAnimations];
    }
    
}