blocks|key|2289064|text|不能在@ViewBuilder块中使用if/let流控制语句。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2289065|这些特殊块中的流控制语句被转换为结构。|2289066|例如：|2289067|if+(someBool)+{
++++View1()
}+else+{
++++View2()
}|code-block|syntax|javascript|2289068|转换为ConditionalValue<View1,+View2>。|2289069|并不是所有的流控制语句在这些块中都可用，例如switch，但这可能会在未来发生变化。|2289070|有关这方面的更多信息，请参阅function+builder+evolution+proposal。|2289071|2289072|在您的特定示例中，您可以重写代码，如下所示：|2289073|struct+ContentView+:+View+{

++++let+elements:+[Any]+=+[View1.self,+View2.self]

++++var+body:+some+View+{
++++++++List+{
++++++++++++ForEach(0..<elements.count)+{+index+in
++++++++++++++++if+self.elements[index]+is+View1+{
++++++++++++++++++++View1()
++++++++++++++++}+else+{
++++++++++++++++++++View2()
++++++++++++++++}
++++++++++++}
++++++++}
++++}
}|2289074|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/apple/swift-evolution/blob/9992cf3c11c2d5e0ea20bee98657d93902d5b174/proposals/XXXX-function-builders.md^0|3|C|J|6|0|0|0|0|3|U|0|M|6|0|E|Z|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|17|8|@$9|18|A|19|B|C]|$9|1A|A|1B|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|1C|8|@]|D|@]|E|$]]|$1|H|3|I|5|6|7|1D|8|@]|D|@]|E|$]]|$1|J|3|K|5|L|7|1E|8|@]|D|@]|E|$M|N]]|$1|O|3|P|5|6|7|1F|8|@$9|1G|A|1H|B|C]]|D|@]|E|$]]|$1|Q|3|R|5|6|7|1I|8|@$9|1J|A|1K|B|C]]|D|@]|E|$]]|$1|S|3|T|5|6|7|1L|8|@]|D|@$9|1M|A|1N|1|1O]]|E|$]]|$1|U|3|-4|5|6|7|1P|8|@]|D|@]|E|$]]|$1|V|3|W|5|6|7|1Q|8|@]|D|@]|E|$]]|$1|X|3|Y|5|L|7|1R|8|@]|D|@]|E|$M|N]]|$1|Z|3|-4|5|6|7|1S|8|@]|D|@]|E|$]]]|10|$11|$5|12|13|14|E|$15|16]]]]

<code>if/let</code> flow control statement cannot be used in a <code>@ViewBuilder</code> block.

Flow control statements inside those special blocks are translated to structs.

e.g.

<pre class="lang-swift prettyprint-override"><code>if (someBool) {
 View1()
} else {
 View2()
}
</code></pre>

is translated to a <code>ConditionalValue&lt;View1, View2&gt;</code>.

Not all flow control statements are available inside those blocks, i.e. <code>switch</code>, but this may change in the future.

More about this in the <a href="https://github.com/apple/swift-evolution/blob/9992cf3c11c2d5e0ea20bee98657d93902d5b174/proposals/XXXX-function-builders.md" rel="noreferrer">function builder evolution proposal</a>.

<hr>

In your specific example you can rewrite the code as follows:

<pre class="lang-swift prettyprint-override"><code>struct ContentView : View {

 let elements: [Any] = [View1.self, View2.self]

 var body: some View {
 List {
 ForEach(0..&lt;elements.count) { index in
 if self.elements[index] is View1 {
 View1()
 } else {
 View2()
 }
 }
 }
 }
}
</code></pre>

blocks|key|2501430|text|您可以使用子视图的动态列表，但您需要小心类型和实例化。作为参考，这是一个动态的“汉堡”演示，github/swiftui_hamburger。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|2501431|//+Pages+View+to+select+current+page
///+This+could+be+refactored+into+the+top+level
struct+Pages:+View+{
++++@Binding+var+currentPage:+Int
++++var+pageArray:+[AnyView]

++++var+body:+AnyView+{
++++++++return+pageArray[currentPage]
++++}
}

//+Top+Level+View
///+Create+two+sub-views+which,+critially,+need+to+be+cast+to+AnyView()+structs
///+Pages+View+then+dynamically+presents+the+subviews,+based+on+currentPage+state
struct+ContentView:+View+{
++++@State+var+currentPage:+Int+=+0

++++let+page0+=+AnyView(
++++++++NavigationView+{
++++++++++++VStack+{
++++++++++++++++Text("Page+Menu").color(.black)

++++++++++++++++List(["1",+"2",+"3",+"4",+"5"].identified(by:+\.self))+{+row+in
++++++++++++++++++++Text(row)
++++++++++++++++}.navigationBarTitle(Text("A+Page"),+displayMode:+.large)
++++++++++++}
++++++++}
++++)

++++let+page1+=+AnyView(
++++++++NavigationView+{
++++++++++++VStack+{
++++++++++++++++Text("Another+Page+Menu").color(.black)

++++++++++++++++List(["A",+"B",+"C",+"D",+"E"].identified(by:+\.self))+{+row+in
++++++++++++++++++++Text(row)
++++++++++++++++}.navigationBarTitle(Text("A+Second+Page"),+displayMode:+.large)
++++++++++++}
++++++++}
++++)

++++var+body:+some+View+{
++++++++let+pageArray:+[AnyView]+=+[page0,+page1]

++++++++return+Pages(currentPage:+self.$currentPage,+pageArray:+pageArray)

++++}
}|code-block|syntax|javascript|2501432|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/moflo/swiftui_hamburger/blob/87f4856c121630e83564b1c4c8319c940b5caac6/hamburgermenu/ContentView.swift#L152^0|1A|O|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@$A|R|B|S|1|T]]|C|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@]|C|$G|H]]|$1|I|3|-4|5|6|7|V|8|@]|9|@]|C|$]]]|J|$K|$5|L|M|N|C|$O|P]]]]

You can use dynamic list of subviews, but you need to be careful with the types and the instantiation. For reference, this is a demo a dynamic 'hamburger' here, <a href="https://github.com/moflo/swiftui_hamburger/blob/87f4856c121630e83564b1c4c8319c940b5caac6/hamburgermenu/ContentView.swift#L152" rel="nofollow noreferrer">github/swiftui_hamburger</a>.

<pre class="lang-swift prettyprint-override"><code>// Pages View to select current page
/// This could be refactored into the top level
struct Pages: View {
 @Binding var currentPage: Int
 var pageArray: [AnyView]

 var body: AnyView {
 return pageArray[currentPage]
 }
}

// Top Level View
/// Create two sub-views which, critially, need to be cast to AnyView() structs
/// Pages View then dynamically presents the subviews, based on currentPage state
struct ContentView: View {
 @State var currentPage: Int = 0

 let page0 = AnyView(
 NavigationView {
 VStack {
 Text("Page Menu").color(.black)

 List(["1", "2", "3", "4", "5"].identified(by: \.self)) { row in
 Text(row)
 }.navigationBarTitle(Text("A Page"), displayMode: .large)
 }
 }
 )

 let page1 = AnyView(
 NavigationView {
 VStack {
 Text("Another Page Menu").color(.black)

 List(["A", "B", "C", "D", "E"].identified(by: \.self)) { row in
 Text(row)
 }.navigationBarTitle(Text("A Second Page"), displayMode: .large)
 }
 }
 )

 var body: some View {
 let pageArray: [AnyView] = [page0, page1]

 return Pages(currentPage: self.$currentPage, pageArray: pageArray)

 }
}
</code></pre>

blocks|key|2289270|text|看起来答案与将视图包装在AnyView中有关|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2289271|struct+ContentView+:+View+{
++++var+myTypes:+[Any]+=+[View1.self,+View2.self]
++++var+body:+some+View+{
++++++++List+{
++++++++++++ForEach(0..<myTypes.count)+{+index+in
++++++++++++++++self.buildView(types:+self.myTypes,+index:+index)
++++++++++++}
++++++++}
++++}
++++
++++func+buildView(types:+[Any],+index:+Int)+->+AnyView+{
++++++++switch+types[index].self+{
+++++++++++case+is+View1.Type:+return+AnyView(+View1()+)
+++++++++++case+is+View2.Type:+return+AnyView(+View2()+)
+++++++++++default:+return+AnyView(EmptyView())
++++++++}
++++}
}|code-block|syntax|javascript|2289272|这样，我现在就可以从服务器获取视图数据并组合它们。此外，它们仅在需要时实例化。|2289273|entityMap^0|C|7|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|R|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|S|8|@]|D|@]|E|$]]|$1|M|3|-4|5|6|7|T|8|@]|D|@]|E|$]]]|N|$]]

Looks like the answer was related to wrapping my view inside of <code>AnyView</code>
<pre><code>struct ContentView : View {
 var myTypes: [Any] = [View1.self, View2.self]
 var body: some View {
 List {
 ForEach(0..&lt;myTypes.count) { index in
 self.buildView(types: self.myTypes, index: index)
 }
 }
 }
 
 func buildView(types: [Any], index: Int) -&gt; AnyView {
 switch types[index].self {
 case is View1.Type: return AnyView( View1() )
 case is View2.Type: return AnyView( View2() )
 default: return AnyView(EmptyView())
 }
 }
}
</code></pre>
With this, i can now get view-data from a server and compose them. Also, they are only instanced when needed.

blocks|key|2289328|text|我找到了一个比上面的答案更简单的方法。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2289329|创建自定义视图。|2289330|确保您的视图是可识别的|offset|length|style|BOLD|2289331|(它告诉SwiftUI，它可以通过查看视图的id属性来区分ForEach中的视图)|2289332|例如，假设您只是将图像添加到HStack，您可以创建一个自定义的SwiftUI视图，如下所示：|2289333|struct+MyImageView:+View,+Identifiable+{
++++//+Conform+to+Identifiable:
++++var+id+=+UUID()
++++//+Name+of+the+image:
++++var+imageName:+String

++++var+body:+some+View+{
++++++++Image(imageName)
++++++++++++.resizable()
++++++++++++.frame(width:+50,+height:+50)
++++}
}|code-block|syntax|javascript|2289334|然后在你的HStack中：|2289335|//+Images:
HStack(spacing:+10)+{
++++ForEach(images,+id:+\.self)+{+imageName+in
++++++++MyImageView(imageName:+imageName)
++++}
++++Spacer()
}|2289336|entityMap^0|0|0|7|4|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Y|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|Z|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|10|8|@$F|11|G|12|H|I]]|9|@]|A|$]]|$1|J|3|K|5|6|7|13|8|@]|9|@]|A|$]]|$1|L|3|M|5|6|7|14|8|@]|9|@]|A|$]]|$1|N|3|O|5|P|7|15|8|@]|9|@]|A|$Q|R]]|$1|S|3|T|5|6|7|16|8|@]|9|@]|A|$]]|$1|U|3|V|5|P|7|17|8|@]|9|@]|A|$Q|R]]|$1|W|3|-4|5|6|7|18|8|@]|9|@]|A|$]]]|X|$]]

I found a little easier way than the answers above. 

Create your custom view. 

Make sure that your view is Identifiable 

(It tells SwiftUI it can distinguish between views inside the ForEach by looking at their id property)

For example, lets say you are just adding images to a HStack, you could create a custom SwiftUI View like:

<pre><code>struct MyImageView: View, Identifiable {
 // Conform to Identifiable:
 var id = UUID()
 // Name of the image:
 var imageName: String

 var body: some View {
 Image(imageName)
 .resizable()
 .frame(width: 50, height: 50)
 }
}
</code></pre>

Then in your HStack:

<pre><code>// Images:
HStack(spacing: 10) {
 ForEach(images, id: \.self) { imageName in
 MyImageView(imageName: imageName)
 }
 Spacer()
}
</code></pre>

blocks|key|2501737|text|您可以通过多态性来完成此操作：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2501738|struct+View1:+View+{
++++var+body:+some+View+{
++++++++Text("View1")
++++}
}

struct+View2:+View+{
++++var+body:+some+View+{
++++++++Text("View2")
++++}
}

class+ViewBase:+Identifiable+{
++++func+showView()+->+AnyView+{
++++++++AnyView(EmptyView())
++++}
}

class+AnyView1:+ViewBase+{
++++override+func+showView()+->+AnyView+{
++++++++AnyView(View1())
++++}
}

class+AnyView2:+ViewBase+{
++++override+func+showView()+->+AnyView+{
++++++++AnyView(View2())
++++}
}

struct+ContentView:+View+{
++++let+views:+[ViewBase]+=+[
++++++++AnyView1(),
++++++++AnyView2()
++++]

++++var+body:+some+View+{
++++++++List(self.views)+{+view+in
++++++++++++view.showView()
++++++++}
++++}
}|code-block|syntax|javascript|2501739|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|$]]

You can do this by polymorphism:

<pre><code>struct View1: View {
 var body: some View {
 Text("View1")
 }
}

struct View2: View {
 var body: some View {
 Text("View2")
 }
}

class ViewBase: Identifiable {
 func showView() -&gt; AnyView {
 AnyView(EmptyView())
 }
}

class AnyView1: ViewBase {
 override func showView() -&gt; AnyView {
 AnyView(View1())
 }
}

class AnyView2: ViewBase {
 override func showView() -&gt; AnyView {
 AnyView(View2())
 }
}

struct ContentView: View {
 let views: [ViewBase] = [
 AnyView1(),
 AnyView2()
 ]

 var body: some View {
 List(self.views) { view in
 view.showView()
 }
 }
}
</code></pre>

blocks|key|2501758|text|SwiftUI+2|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2501759|您现在可以直接在@ViewBuilder块中使用控制流语句，这意味着以下代码完全有效：|offset|length|style|CODE|2501760|struct+ContentView:+View+{
++++let+elements:+[Any]+=+[View1.self,+View2.self]

++++var+body:+some+View+{
++++++++List+{
++++++++++++ForEach(0+..<+elements.count)+{+index+in
++++++++++++++++if+let+_+=+elements[index]+as?+View1+{
++++++++++++++++++++View1()
++++++++++++++++}+else+{
++++++++++++++++++++View2()
++++++++++++++++}
++++++++++++}
++++++++}
++++}
}|code-block|syntax|javascript|2501761|SwiftUI+1|2501762|除了可以接受的answer之外，您还可以使用@ViewBuilder，完全避免使用AnyView：|2501763|@ViewBuilder
func+buildView(types:+[Any],+index:+Int)+->+some+View+{
++++switch+types[index].self+{
++++case+is+View1.Type:+View1()
++++case+is+View2.Type:+View2()
++++default:+EmptyView()
++++}
}|2501764|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/a/56681450/8697793^0|0|8|C|0|0|0|M|C|15|7|7|6|0|0|0^^$0|@$1|2|3|4|5|6|7|10|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|11|8|@$D|12|E|13|F|G]]|9|@]|A|$]]|$1|H|3|I|5|J|7|14|8|@]|9|@]|A|$K|L]]|$1|M|3|N|5|6|7|15|8|@]|9|@]|A|$]]|$1|O|3|P|5|6|7|16|8|@$D|17|E|18|F|G]|$D|19|E|1A|F|G]]|9|@$D|1B|E|1C|1|1D]]|A|$]]|$1|Q|3|R|5|J|7|1E|8|@]|9|@]|A|$K|L]]|$1|S|3|-4|5|6|7|1F|8|@]|9|@]|A|$]]]|T|$U|$5|V|W|X|A|$Y|Z]]]]

<h3>SwiftUI 2</h3>
You can now use control flow statements directly in <code>@ViewBuilder</code> blocks, which means the following code is perfectly valid:
<pre><code>struct ContentView: View {
 let elements: [Any] = [View1.self, View2.self]

 var body: some View {
 List {
 ForEach(0 ..&lt; elements.count) { index in
 if let _ = elements[index] as? View1 {
 View1()
 } else {
 View2()
 }
 }
 }
 }
}
</code></pre>
<h3>SwiftUI 1</h3>
In addition to the accepted <a href="https://stackoverflow.com/a/56681450/8697793">answer</a> you can use <code>@ViewBuilder</code> and avoid <code>AnyView</code> completely:
<pre><code>@ViewBuilder
func buildView(types: [Any], index: Int) -&gt; some View {
 switch types[index].self {
 case is View1.Type: View1()
 case is View2.Type: View2()
 default: EmptyView()
 }
}
</code></pre>

blocks|key|2289685|text|Swift+5|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|2289686|这似乎对我很有效。|2289687|struct+AMZ1:+View+{
++++var+body:+some+View+{+++++++++
+++++++Text("Text")+++++
++++}
+}

struct+PageView:+View+{
++++
+++let+elements:+[Any]+=+[AMZ1(),+AMZ2(),+AMZ3()]
++++
+++var+body:+some+View+{
+++++TabView+{
+++++++ForEach(0..<elements.count)+{+index+in
+++++++++if+self.elements[index]+is+AMZ1+{
+++++++++++++AMZ1()
+++++++++++}+else+if+self.elements[index]+is+AMZ2+{
+++++++++++++AMZ2()
+++++++++++}+else+{
+++++++++++++AMZ3()
++++++}
+++}
}|code-block|syntax|javascript|2289688|entityMap^0|0|7|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|R|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|S|8|@]|D|@]|E|$K|L]]|$1|M|3|-4|5|6|7|T|8|@]|D|@]|E|$]]]|N|$]]

Swift 5
this seems to work for me.
<pre><code>struct AMZ1: View {
 var body: some View { 
 Text(&quot;Text&quot;) 
 }
 }

struct PageView: View {
 
 let elements: [Any] = [AMZ1(), AMZ2(), AMZ3()]
 
 var body: some View {
 TabView {
 ForEach(0..&lt;elements.count) { index in
 if self.elements[index] is AMZ1 {
 AMZ1()
 } else if self.elements[index] is AMZ2 {
 AMZ2()
 } else {
 AMZ3()
 }
 }
}
</code></pre>

blocks|key|2289696|text|import+SwiftUI

struct+ContentView:+View+{
++++
++++var+animationList:+[Any]+=+[
++++++++AnimationDemo.self,+WithAnimationDemo.self,+TransitionDemo.self
++++]
++++
++++var+body:+some+View+{
++++++++NavigationView+{
++++++++++++List+{
++++++++++++++++ForEach(0..<animationList.count)+{+index+in
++++++++++++++++++++NavigationLink(
++++++++++++++++++++++++destination:+animationIndex(types:+animationList,+index:+index),
++++++++++++++++++++++++label:+{
++++++++++++++++++++++++++++listTitle(index:+index)
++++++++++++++++++++++++})
++++++++++++++++}
++++++++++++++++
++++++++++++}
++++++++++++.navigationBarTitle("Animations")
++++++++}
++++}
++++
++++@ViewBuilder
++++func+listTitle(index:+Int)+->+some+View+{
++++++++switch+index+{
++++++++case+0:
++++++++++++Text("AnimationDemo").font(.title2).bold()
++++++++case+1:
++++++++++++Text("WithAnimationDemo").font(.title2).bold()
++++++++case+2:
++++++++++++Text("TransitionDemo").font(.title2).bold()
++++++++default:
++++++++++++EmptyView()
++++++++}
++++}
++++
++++@ViewBuilder
++++func+animationIndex(types:+[Any],+index:+Int)+->+some+View+{
++++++++switch+types[index].self+{
++++++++case+is+AnimationDemo.Type:
++++++++++++AnimationDemo()
++++++++case+is+WithAnimationDemo.Type:
++++++++++++WithAnimationDemo()
++++++++case+is+TransitionDemo.Type:
++++++++++++TransitionDemo()
++++++++default:
++++++++++++EmptyView()
++++++++}
++++}
}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|2289697|enter+image+description+here|unstyled|offset|length|2289698|entityMap|0|LINK|mutability|MUTABLE|url|https://i.stack.imgur.com/GqgKn.jpg^0|0|0|S|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|R|8|@]|9|@$G|S|H|T|1|U]]|A|$]]|$1|I|3|-4|5|F|7|V|8|@]|9|@]|A|$]]]|J|$K|$5|L|M|N|A|$O|P]]]]

<pre><code>import SwiftUI

struct ContentView: View {
 
 var animationList: [Any] = [
 AnimationDemo.self, WithAnimationDemo.self, TransitionDemo.self
 ]
 
 var body: some View {
 NavigationView {
 List {
 ForEach(0..&lt;animationList.count) { index in
 NavigationLink(
 destination: animationIndex(types: animationList, index: index),
 label: {
 listTitle(index: index)
 })
 }
 
 }
 .navigationBarTitle(&quot;Animations&quot;)
 }
 }
 
 @ViewBuilder
 func listTitle(index: Int) -&gt; some View {
 switch index {
 case 0:
 Text(&quot;AnimationDemo&quot;).font(.title2).bold()
 case 1:
 Text(&quot;WithAnimationDemo&quot;).font(.title2).bold()
 case 2:
 Text(&quot;TransitionDemo&quot;).font(.title2).bold()
 default:
 EmptyView()
 }
 }
 
 @ViewBuilder
 func animationIndex(types: [Any], index: Int) -&gt; some View {
 switch types[index].self {
 case is AnimationDemo.Type:
 AnimationDemo()
 case is WithAnimationDemo.Type:
 WithAnimationDemo()
 case is TransitionDemo.Type:
 TransitionDemo()
 default:
 EmptyView()
 }
 }
}
</code></pre>
<a href="https://i.stack.imgur.com/GqgKn.jpg" rel="nofollow noreferrer">enter image description here</a>

I can do a static List like

<pre><code>List {
 View1()
 View2()
}
</code></pre>

But how do i make a dynamic list of elements from an array?
I tried the following but got error: Closure containing control flow statement cannot be used with function builder 'ViewBuilder'

<pre><code> let elements: [Any] = [View1.self, View2.self]

 List {
 ForEach(0..&lt;elements.count) { index in
 if let _ = elements[index] as? View1 {
 View1()
 } else {
 View2()
 }
 }
}
</code></pre>

Is there any work around for this?
What I am trying to accomplish is a List contaning dynamic set of elements that are not statically entered.

How to have a dynamic List of Views using SwiftUI

我可以做一个静态列表，比如List {   View1()   View2()}但是，如何从数组中创建元素的动态列表呢？我尝试了以下方法，但遇到错误:包含控制流语句的闭包不能与函数构建器'ViewBuilder'一起使用    let elements: [Any] = [View1.self, View2.self]...

问如何使用SwiftUI创建动态视图列表
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问如何使用SwiftUI创建动态视图列表
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