在cell 里推页面的时候.
// 获取该视图层最下边的VC.
id object = [self nextResponder];
while (![object isKindOfClass:[UIViewController class]] &&
object != nil) {
object = [object nextResponder];
}
UIViewController *vc = (UIViewController*)object;
// VideoPlayerVC 是被推出的VC.
VideoPlayerVC *player = [[VideoPlayerVC alloc] init];
[vc.navigationController pushViewController:player animated:YES];
