使用 present 方法实现页面返回跳转（多层返回跳转）

我们在使用present 方法进行页面的跳转时一般使用是：

UIViewController * viewController = [UIViewController

alloc] init]；

[self presentViewController:viewController animated:YES
completion:^{

}];

但很多时候我们需要跨页面返回，或者是先返回到某一页面之后再跳转别的页面
这就需要一下操作：

//可能要在dismiss
之前设置ViewController
UIViewController * productDetailViewController =
self.presentingViewController;
UIViewController * productListViewController = productDetailViewController.presentingViewController;
UIViewController * agentShopViewController = productListViewController.presentingViewController;

if ([productDetailViewController
isKindOfClass:[AgentProductDetailViewController
class]]) {
[self
dismissViewControllerAnimated:NO
completion:^{
[productDetailViewController
dismissViewControllerAnimated:NO
completion:^{
[productListViewController
dismissViewControllerAnimated:NO
completion:^{
// AgentShopViewController *agentShopViewController = (AgentShopViewController*)productListViewController.presentingViewController;
UIStoryboard * tmpStory = [UIStoryboard
storyboardWithName:Main bundle:nil];
AgentProductLibraryViewController* AgentProductLibraryVC = [tmpStory
instantiateViewControllerWithIdentifier:@"AgentProductLibraryViewController"];

[agentShopViewController
presentViewController:AgentProductLibraryVC
animated:YES
completion:^{
}];
}];
}];

}];
}else{
[self
dismissViewControllerAnimated:NO
completion:^{
UIStoryboard * tmpStory = [UIStoryboard
storyboardWithName:AGENTSYSTEMSTORYBOARDIDENTIFIER
bundle:nil];
AgentProductLibraryViewController* AgentProductLibraryVC = [tmpStory
instantiateViewControllerWithIdentifier:@"AgentProductLibraryViewController"];

[productDetailViewController
presentViewController:AgentProductLibraryVC
animated:YES
completion:^{

}];
}];
}

}];