blocks|key|4474478|text|我现在不能测试它，但这应该可以在Swift+2中工作：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4474479|view.subviews.flatMap{+$0+as?+YourView+}|code-block|syntax|javascript|4474480|它返回一个YourView数组|offset|length|style|CODE|4474481|下面是一个经过测试的典型示例，用于获取计数：|4474482|countDots+=+allDots!.view.subviews.flatMap{$0+as?+Dot}.count|4474483|entityMap^0|0|0|5|8|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|U|8|@$I|V|J|W|K|L]]|9|@]|A|$]]|$1|M|3|N|5|6|7|X|8|@]|9|@]|A|$]]|$1|O|3|P|5|D|7|Y|8|@]|9|@]|A|$E|F]]|$1|Q|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]]|R|$]]

I can't test it right now but this should work in Swift 2:

<pre><code>view.subviews.flatMap{ $0 as? YourView }
</code></pre>

Which returns an array of <code>YourView</code>

Here's a tested, typical example, to get a count:

<pre><code>countDots = allDots!.view.subviews.flatMap{$0 as? Dot}.count
</code></pre>

blocks|key|4474002|text|如果您想要更新/访问这些特定子视图，|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4474003|for+(index,button)+in+(view.subviews.filter{$0+is+UIButton}).enumerated(){
++++button.isHidden+=+false
}|code-block|syntax|javascript|4474004|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 want to update/access those specific subviews then use this,

<pre><code>for (index,button) in (view.subviews.filter{$0 is UIButton}).enumerated(){
 button.isHidden = false
}
</code></pre>

blocks|key|4474055|text|要递归地执行此操作(也就是获取所有子视图的视图)，您可以使用以下通用函数：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4474056|private+func+getSubviewsOf<T+:+UIView>(view:UIView)+->+[T]+{
++++var+subviews+=+[T]()

++++for+subview+in+view.subviews+{
++++++++subviews+%2B=+getSubviewsOf(view:+subview)+as+[T]

++++++++if+let+subview+=+subview+as?+T+{
++++++++++++subviews.append(subview)
++++++++}
++++}

++++return+subviews
}|code-block|syntax|javascript|4474057|要获取视图层次结构中的所有UILabel，只需执行以下操作：|4474058|let+allLabels+:+[UILabel]+=+getSubviewsOf(view:+theView)|4474059|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|$]]

To do this recursively (I.e. fetching all subview's views aswell), you can use this generic function:

<pre><code>private func getSubviewsOf&lt;T : UIView&gt;(view:UIView) -&gt; [T] {
 var subviews = [T]()

 for subview in view.subviews {
 subviews += getSubviewsOf(view: subview) as [T]

 if let subview = subview as? T {
 subviews.append(subview)
 }
 }

 return subviews
}
</code></pre>

To fetch all UILabel's in a view hierarchy, just do this:

<pre><code>let allLabels : [UILabel] = getSubviewsOf(view: theView)
</code></pre>

blocks|key|4474674|text|这就是你要的|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4474675|++++extension+UIView+{

++++/**+This+is+the+function+to+get+subViews+of+a+view+of+a+particular+type+
*/
++++func+subViews<T+:+UIView>(type+:+T.Type)+->+[T]{
++++++++var+all+=+[T]()
++++++++for+view+in+self.subviews+{
++++++++++++if+let+aView+=+view+as?+T{
++++++++++++++++all.append(aView)
++++++++++++}
++++++++}
++++++++return+all
++++}


/**+This+is+a+function+to+get+subViews+of+a+particular+type+from+view+recursively.+It+would+look+recursively+in+all+subviews+and+return+back+the+subviews+of+the+type+T+*/
++++++++func+allSubViewsOf<T+:+UIView>(type+:+T.Type)+->+[T]{
++++++++++++var+all+=+[T]()
++++++++++++func+getSubview(view:+UIView)+{
++++++++++++++++if+let+aView+=+view+as?+T{
++++++++++++++++all.append(aView)
++++++++++++++++}
++++++++++++++++guard+view.subviews.count>0+else+{+return+}
++++++++++++++++view.subviews.forEach{+getSubview(view:+$0)+}
++++++++++++}
++++++++++++getSubview(view:+self)
++++++++++++return+all
++++++++}
++++}|code-block|syntax|javascript|4474676|你可以这样称呼它|4474677|let+allSubviews+=+view.allSubViewsOf(type:+UIView.self)
let+allLabels+=+view.allSubViewsOf(type:+UILabel.self)|4474678|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|$]]

Here you go 

<pre><code> extension UIView {

 /** This is the function to get subViews of a view of a particular type 
*/
 func subViews&lt;T : UIView&gt;(type : T.Type) -&gt; [T]{
 var all = [T]()
 for view in self.subviews {
 if let aView = view as? T{
 all.append(aView)
 }
 }
 return all
 }


/** This is a function to get subViews of a particular type from view recursively. It would look recursively in all subviews and return back the subviews of the type T */
 func allSubViewsOf&lt;T : UIView&gt;(type : T.Type) -&gt; [T]{
 var all = [T]()
 func getSubview(view: UIView) {
 if let aView = view as? T{
 all.append(aView)
 }
 guard view.subviews.count&gt;0 else { return }
 view.subviews.forEach{ getSubview(view: $0) }
 }
 getSubview(view: self)
 return all
 }
 }
</code></pre>

You can call it like 

<pre><code>let allSubviews = view.allSubViewsOf(type: UIView.self)
let allLabels = view.allSubViewsOf(type: UILabel.self)
</code></pre>

blocks|key|4474721|text|对于这种情况，我认为我们可以使用Swift的first.where语法，它比filter.count，filter.isEmpty更有效。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|4474722|因为当我们使用filter时，它将创建一个底层数组，因此效率不高，假设我们有一个大型集合。|4474723|因此，只需检查视图的subViews集合是否包含特定类型的类，我们可以使用以下代码|4474724|let+containsBannerViewKind+=+view.subviews.first(where:+{+$0+is+BannerView+})+!=+nil|code-block|syntax|javascript|4474725|这相当于:在此视图的subViews集合中查找与BannerView类匹配的第一个类。因此，如果这是真的，我们可以进行进一步的逻辑。|4474726|参考：https://github.com/realm/SwiftLint/blob/master/Rules.md#first-where|4474727|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/realm/SwiftLint/blob/master/Rules.md#first-where^0|M|B|12|C|1F|E|0|7|6|0|A|8|0|0|0|3|1V|0|0^^$0|@$1|2|3|4|5|6|7|10|8|@$9|11|A|12|B|C]|$9|13|A|14|B|C]|$9|15|A|16|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|17|8|@$9|18|A|19|B|C]]|D|@]|E|$]]|$1|H|3|I|5|6|7|1A|8|@$9|1B|A|1C|B|C]]|D|@]|E|$]]|$1|J|3|K|5|L|7|1D|8|@]|D|@]|E|$M|N]]|$1|O|3|P|5|6|7|1E|8|@]|D|@]|E|$]]|$1|Q|3|R|5|6|7|1F|8|@]|D|@$9|1G|A|1H|1|1I]]|E|$]]|$1|S|3|-4|5|6|7|1J|8|@]|D|@]|E|$]]]|T|$U|$5|V|W|X|E|$Y|Z]]]]

For this case, I think we could use Swift's <code>first.where</code> syntax, which is more efficient than <code>filter.count</code>, <code>filter.isEmpty</code>. 

Because when we use <code>filter</code>, it will create a underlying array, thus not effective, imagine we have a large collection.

So just check if a view's <code>subViews</code> collection contains a specific kind of class, we can use this

<pre><code>let containsBannerViewKind = view.subviews.first(where: { $0 is BannerView }) != nil
</code></pre>

which equivalent to: find me the first match to BannerView class in this view's subViews collection. So if this is true, we can carry out our further logic.

Reference: <a href="https://github.com/realm/SwiftLint/blob/master/Rules.md#first-where" rel="nofollow noreferrer">https://github.com/realm/SwiftLint/blob/master/Rules.md#first-where</a>

blocks|key|4474207|text|func+allSubViews(views:+[UIView])+{
++++for+view+in+views+{
++++++++if+let+tf+=+view+as?+UITextField+{
+++++++++++++//+Do+Something
++++++++}
++++++++self.allSubViews(views:+view.subviews)
++++}
}

self.allSubViews(views:+self.view.subviews)|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|4474208|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>func allSubViews(views: [UIView]) {
 for view in views {
 if let tf = view as? UITextField {
 // Do Something
 }
 self.allSubViews(views: view.subviews)
 }
}

self.allSubViews(views: self.view.subviews)
</code></pre>

blocks|key|4474257|text|在Swift+4.1中，您可以使用新的compactMap+(flatMap现在已被删除)：https://developer.apple.com/documentation/swift/sequence/2950916-compactmap+(请参阅内部示例)|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|4474258|在您的示例中，您可以使用：|4474259|let+buttons:[UIButton]+=+stackView.subviews.compactMap{+$0+as?+UIButton+}|code-block|syntax|javascript|4474260|您可以使用map对所有按钮执行操作：|4474261|let+_+=+stackView.subviews.compactMap{+$0+as?+UIButton+}.map+{+$0.isSelected+=+false+}|4474262|entityMap|0|LINK|mutability|MUTABLE|url|https://developer.apple.com/documentation/swift/sequence/2950916-compactmap^0|1A|23|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@$A|X|B|Y|1|Z]]|C|$]]|$1|D|3|E|5|6|7|10|8|@]|9|@]|C|$]]|$1|F|3|G|5|H|7|11|8|@]|9|@]|C|$I|J]]|$1|K|3|L|5|6|7|12|8|@]|9|@]|C|$]]|$1|M|3|N|5|H|7|13|8|@]|9|@]|C|$I|J]]|$1|O|3|-4|5|6|7|14|8|@]|9|@]|C|$]]]|P|$Q|$5|R|S|T|C|$U|V]]]]

From Swift 4.1, you can use new compactMap (flatMap is now depcrecated): <a href="https://developer.apple.com/documentation/swift/sequence/2950916-compactmap" rel="noreferrer">https://developer.apple.com/documentation/swift/sequence/2950916-compactmap</a>
(see examples inside) 

In your case, you can use:

<pre><code>let buttons:[UIButton] = stackView.subviews.compactMap{ $0 as? UIButton }
</code></pre>

And you can execute actions to all buttons using map:

<pre><code>let _ = stackView.subviews.compactMap{ $0 as? UIButton }.map { $0.isSelected = false }
</code></pre>

blocks|key|4474975|text|让我发布我的变体)但是这个，找到了T的第一个|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4474976|extension+UIView+{

++++func+firstSubView<T:+UIView>(ofType+type:+T.Type)+->+T?+{
++++++++var+resultView:+T?
++++++++for+view+in+subviews+{
++++++++++++if+let+view+=+view+as?+T+{
++++++++++++++++resultView+=+view
++++++++++++++++break
++++++++++++}
++++++++++++else+{
++++++++++++++++if+let+foundView+=+view.firstSubView(ofType:+T.self)+{
++++++++++++++++++++resultView+=+foundView
++++++++++++++++++++break
++++++++++++++++}
++++++++++++}
++++++++}
++++++++return+resultView
++++}
}|code-block|syntax|javascript|4474977|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|$]]

Let me post my variation of this) but this, finds the first of T

<pre><code>extension UIView {

 func firstSubView&lt;T: UIView&gt;(ofType type: T.Type) -&gt; T? {
 var resultView: T?
 for view in subviews {
 if let view = view as? T {
 resultView = view
 break
 }
 else {
 if let foundView = view.firstSubView(ofType: T.self) {
 resultView = foundView
 break
 }
 }
 }
 return resultView
 }
}
</code></pre>

blocks|key|4474329|text|Swift+5|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4474330|func+findViewInside<T>(views:+[UIView]?,+findView:+[T]+=+[],+findType:+T.Type+=+T.self)+->+[T]+{
++++var+findView+=+findView
++++let+views+=+views+??+[]
++++guard+views.count+>+.zero+else+{+return+findView+}
++++let+firstView+=+views[0]
++++var+loopViews+=+views.dropFirst()
++++
++++if+let+typeView+=+firstView+as?+T+{
++++++++findView+=+findView+%2B+[typeView]
++++++++return+findViewInside(views:+Array(loopViews),+findView:+findView)
++++}+else+if+firstView.subviews.count+>+.zero+{
++++++++firstView.subviews.forEach+{+loopViews.append($0)+}
++++++++return+findViewInside(views:+Array(loopViews),+findView:+findView)
++++}+else+{
++++++++return+findViewInside(views:+Array(loopViews),+findView:+findView)
++++}
}|code-block|syntax|javascript|4474331|使用方法：|4474332|findViewInside(views:+(YourViews),+findType:+(YourType).self)|4474333|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|$]]

Swift 5
<pre><code>func findViewInside&lt;T&gt;(views: [UIView]?, findView: [T] = [], findType: T.Type = T.self) -&gt; [T] {
 var findView = findView
 let views = views ?? []
 guard views.count &gt; .zero else { return findView }
 let firstView = views[0]
 var loopViews = views.dropFirst()
 
 if let typeView = firstView as? T {
 findView = findView + [typeView]
 return findViewInside(views: Array(loopViews), findView: findView)
 } else if firstView.subviews.count &gt; .zero {
 firstView.subviews.forEach { loopViews.append($0) }
 return findViewInside(views: Array(loopViews), findView: findView)
 } else {
 return findViewInside(views: Array(loopViews), findView: findView)
 }
}
</code></pre>
How to use:
<pre><code>findViewInside(views: (YourViews), findType: (YourType).self)
</code></pre>

I have a custom class of buttons in a UIView that I'd like to add to an array so that they're easily accessible. Is there a way to get all subviews of a specific class and add it to an array in Swift?

Swift: Get all subviews of a specific type and add to an array

Swift

我在一个UIView中有一个自定义的按钮类，我想把它添加到一个数组中，这样就可以很容易地访问它们。有没有办法获取特定类的所有子视图并将其添加到Swift中的数组中？

问Swift:获取特定类型的所有子视图并添加到数组中
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