-(void)backAction{
UINavigationController *navVC = self.navigationController;
NSMutableArray *viewControllers = [[NSMutableArray alloc] init];
for (UIViewController *vc in [navVC viewControllers]) {
[viewControllers addObject:vc];
if ([vc isKindOfClass:[指定的控制器 class]]) {
break;
}
}
[navVC setViewControllers:viewControllers animated:YES];
}
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