Swift - UINavigationController pop 的方式

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方式1

直接返回到根视图

self.navigationController?.popToRootViewController(animated: true)

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方式2

返回到上一个视图

self.navigationController?.popViewController(animated: true)

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方式3

返回指定视图

for vc in (self.navigationController?.viewControllers)!
        {
            if vc is ViewController
            {
                self.navigationController?.popToViewController(vc, animated: true)
            }
        }