blocks|key|93920|text|我有一个解决你问题的办法。如果您使用code呈现视图，请尝试使用此代码关闭视图控制器：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|93921|Swift+3：|93922|self.dismiss(animated:+true,+completion:+nil)|code-block|syntax|javascript|93923|或|93924|如果您使用"push“segue呈现视图|93925|self.navigationController?.popViewController(animated:+true)|93926|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|R|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|S|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|T|8|@]|9|@]|A|$]]|$1|K|3|L|5|6|7|U|8|@]|9|@]|A|$]]|$1|M|3|N|5|F|7|V|8|@]|9|@]|A|$G|H]]|$1|O|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|P|$]]

I have a solution for your problem. Please try this code to dismiss the view controller if you present the view using modal:

Swift 3:

<pre><code>self.dismiss(animated: true, completion: nil)
</code></pre>

OR

If you present the view using "push" segue

<pre><code>self.navigationController?.popViewController(animated: true)
</code></pre>

blocks|key|93961|text|如果您这样做，我猜您可能在控制台中得不到println消息，|type|unstyled|depth|inlineStyleRanges|entityRanges|data|93962|@IBAction+func+cancel(sender:+AnyObject)+{
++if(self.presentingViewController){
++++self.dismissViewControllerAnimated(false,+completion:+nil)
++++println("cancel")
+++}
}

@IBAction+func+done(sender:+AnyObject)+{
++if(self.presentingViewController){
++++self.dismissViewControllerAnimated(false,+completion:+nil)
++++println("done")
++}++++
}|code-block|syntax|javascript|93963|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

if you do this i guess you might not get println message in console,

<pre><code>@IBAction func cancel(sender: AnyObject) {
 if(self.presentingViewController){
 self.dismissViewControllerAnimated(false, completion: nil)
 println("cancel")
 }
}

@IBAction func done(sender: AnyObject) {
 if(self.presentingViewController){
 self.dismissViewControllerAnimated(false, completion: nil)
 println("done")
 } 
}
</code></pre>

blocks|key|93973|text|使用：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|93974|self.dismiss(animated:+true,+completion:+nil)|code-block|syntax|javascript|93975|而不是：|93976|self.navigationController.dismissViewControllerAnimated(true,+completion:+nil)|93977|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

Use:

<pre><code>self.dismiss(animated: true, completion: nil)
</code></pre>

instead of:

<pre><code>self.navigationController.dismissViewControllerAnimated(true, completion: nil)
</code></pre>

blocks|key|94011|text|作为参考，请注意您可能忽略了错误的视图控制器。例如，如果有一个警告框或模式显示在另一个模式的顶部。(例如，您可以在当前模式警报的顶部显示Twitter+post警报)。在这种情况下，您需要调用dismiss两次，或者使用一个展开段。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|94012|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

For reference, be aware that you might be dismissing the wrong view controller. For example, if you have an alert box or modal showing on top of another modal. (You could have a Twitter post alert showing on top of your current modal alert, for example). In this case, you need to call dismiss twice, or use an unwind segue.

blocks|key|4600164|text|如果呈现没有导航控制器的控制器，则可以从呈现的控制器的方法调用以下代码。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4600165|self.presentingViewController?.dismiss(animated:+true,+completion:+nil)|code-block|syntax|javascript|4600166|如果您的ViewController是以模态的形式呈现的，则可选的presentingViewController将不为空，并且代码将被执行。|4600167|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

If you presenting a controller without a Navigation Controller, you can call the following code from a method of the presented controller.

<pre><code>self.presentingViewController?.dismiss(animated: true, completion: nil)
</code></pre>

If your ViewController is presented modally, optional presentingViewController will be not nil and the code will be executed.

blocks|key|4600211|text|如果您正在以模态方式呈现ViewController，并且想要返回到根ViewController，请在返回到根ViewController之前注意清除此以模态呈现的ViewController，否则此ViewController将不会从内存中删除并导致内存泄漏。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4600212|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

If you are presenting a ViewController modally, and want to go back to the root ViewController, take care to dismiss this modally presented ViewController before you go back to the root ViewController otherwise this ViewController will not be removed from Memory and cause Memory leaks.

blocks|key|4600232|text|在Swift+3.0到4.0中，只需在函数中输入以下内容：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4600233|self.dismiss(animated:+true,+completion:+nil)|code-block|syntax|javascript|4600234|或者，如果你在一个导航控制器中，你可以“弹出”它：|4600235|self.navigationController?.popViewController(animated:+true)|4600236|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

In Swift 3.0 to 4.0 it's as easy as typing this into your function:

<pre><code>self.dismiss(animated: true, completion: nil)
</code></pre>

Or if you're in a navigation controller you can "pop" it:

<pre><code>self.navigationController?.popViewController(animated: true)
</code></pre>

blocks|key|4600261|text|根据我的经验，我添加了一个方法，将我作为UIViewController的扩展：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4600262|extension+UIViewController+{
++++func+dismissMe(animated:+Bool,+completion:+(()->())?)+{
++++++++var+count+=+0
++++++++if+let+c+=+self.navigationController?.viewControllers.count+{
++++++++++++count+=+c
++++++++}
++++++++if+count+>+1+{
++++++++++++self.navigationController?.popViewController(animated:+animated)
++++++++++++if+let+handler+=+completion+{
++++++++++++++++handler()
++++++++++++}
++++++++}+else+{
++++++++++++dismiss(animated:+animated,+completion:+completion)
++++++++}
++++}
}|code-block|syntax|javascript|4600263|然后，我调用此方法来消除任何UIViewController子类中的视图控制器。例如，在取消操作中：|offset|length|style|CODE|4600264|class+MyViewController:+UIViewController+{
+++...
+++@IBAction+func+cancel(sender:+AnyObject)+{
+++++dismissMe(animated:+true,+completion:+nil)
+++}
+++...
}|4600265|entityMap^0|0|0|E|G|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|S|8|@$I|T|J|U|K|L]]|9|@]|A|$]]|$1|M|3|N|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|O|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|P|$]]

Based on my experience, I add a method to dismiss me as extension to UIViewController:

<pre><code>extension UIViewController {
 func dismissMe(animated: Bool, completion: (()-&gt;())?) {
 var count = 0
 if let c = self.navigationController?.viewControllers.count {
 count = c
 }
 if count &gt; 1 {
 self.navigationController?.popViewController(animated: animated)
 if let handler = completion {
 handler()
 }
 } else {
 dismiss(animated: animated, completion: completion)
 }
 }
}
</code></pre>

Then I call this method to dismiss view controller in any <code>UIViewController</code> subclass. For example, in cancel action:

<pre><code>class MyViewController: UIViewController {
 ...
 @IBAction func cancel(sender: AnyObject) {
 dismissMe(animated: true, completion: nil)
 }
 ...
}
</code></pre>

blocks|key|94185|text|因此，如果你想关闭你的视图控制器，使用这个。此代码是在按钮操作中编写的，用于解除VC|type|unstyled|depth|inlineStyleRanges|entityRanges|data|94186|++@IBAction+func+cancel(sender:+AnyObject)+{
+++dismiss(animated:+true,+completion:+nil)
++}|code-block|syntax|javascript|94187|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

So if you wanna dismiss your Viewcontroller use this. This code is written in button action to dismiss VC
<pre><code> @IBAction func cancel(sender: AnyObject) {
 dismiss(animated: true, completion: nil)
 }
</code></pre>

blocks|key|4600306|text|在Swift+4.1和Xcode+9.4.1中|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4600307|如果您使用pushViewController来表示新的视图控制器，请使用这个|4600308|self.navigationController?.popViewController(animated:+false)|code-block|syntax|javascript|4600309|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|L|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|M|8|@]|9|@]|A|$G|H]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

In Swift 4.1 and Xcode 9.4.1

If you use pushViewController to present new view controller, use this

<pre><code>self.navigationController?.popViewController(animated: false)
</code></pre>

blocks|key|94221|text|试试这个：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|94222|@IBAction+func+close()+{
++dismiss(animated:+true,+completion:+nil)
}|code-block|syntax|javascript|94223|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Try this:

<pre><code>@IBAction func close() {
 dismiss(animated: true, completion: nil)
}
</code></pre>

blocks|key|4600329|text|@IBAction+func+back(_+sender:+Any)+{
++++++++self.dismiss(animated:+false,+completion:+nil)
++++}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|4600330|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>@IBAction func back(_ sender: Any) {
 self.dismiss(animated: false, completion: nil)
 }
</code></pre>

blocks|key|94267|text|如果您在父VC中使用present方法，则应调用此函数，若要删除子VC，请使用以下代码|type|unstyled|depth|inlineStyleRanges|entityRanges|data|94268|self.dismiss(animated:+true,+completion:+nil)|code-block|syntax|javascript|94269|如果您使用push方法调用子VC，若要解除该子VC，请使用此|94270|self.navigationController?.popViewController(animated:+true)|94271|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

If you using the present method in the parent VC then you should call this function, to dismiss the child VC use this

<pre><code>self.dismiss(animated: true, completion: nil)
</code></pre>

if you calling child VC by using push method, to dismiss the child VC use this

<pre><code>self.navigationController?.popViewController(animated: true)
</code></pre>

blocks|key|4600427|text|由于您使用了推送呈现的viewController，因此，您可以使用|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4600428|self.dismiss(animated:+false,+completion:+nil)|code-block|syntax|javascript|4600429|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Since you used push presented viewController, therefore, you can use
<pre><code>self.dismiss(animated: false, completion: nil)
</code></pre>

I am trying to dismiss a ViewController in swift by calling <code>dismissViewController</code> in an <code>IBAction</code>

<pre><code> @IBAction func cancel(sender: AnyObject) {
 self.dismissViewControllerAnimated(false, completion: nil)
 println("cancel")
}

@IBAction func done(sender: AnyObject) {
 self.dismissViewControllerAnimated(false, completion: nil)
 println("done")
}
</code></pre>

<img src="https://i.stack.imgur.com/zH1KJ.png" alt="random image of a segue">

I could see the println message in console output but ViewController never gets dismissed. What could be the problem?

How to dismiss ViewController in Swift?

Swift

Xcode

我正在尝试通过在ViewController中调用dismissViewController来关闭swift中的IBAction  @IBAction func cancel(sender: AnyObject) {    self.dismissViewControllerAnimated(false, comple...

问如何消除Swift中的ViewController？
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