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How to group views together
Updated for Xcode 14.0 beta 1
If you need several views to act as one – for example, to transition together – then you should use SwiftUI’s Group view. This is particularly important because, for underlying technical reasons, you can only add up to 10 views to a parent view at a time.
To demonstrate this, here’s a VStack with 10 pieces of text:
VStack {
Text("Line 1")
Text("Line 2")
Text("Line 3")
Text("Line 4")
Text("Line 5")
Text("Line 6")
Text("Line 7")
Text("Line 8")
Text("Line 9")
Text("Line 10")
}
Download this as an Xcode project
That works just fine, but if you try adding an eleventh piece of text, you’ll get an error like this one: ambiguous reference to member 'buildBlock()’.
…almost certainly followed by a lot more error text.
This is because SwiftUI’s view building system has various code designed to let us add 1 view, 2 views, 3 views, or 4, 5, 6, 7, 8, 9, and 10 views, but not for 11 and beyond – that doesn’t work.
Fortunately, we can use a group like this:
VStack {
Group {
Text("Line 1")
Text("Line 2")
Text("Line 3")
Text("Line 4")
Text("Line 5")
Text("Line 6")
}
Group {
Text("Line 7")
Text("Line 8")
Text("Line 9")
Text("Line 10")
Text("Line 11")
}
} Download this as an Xcode project
That creates exactly the same result, except now we can go beyond the 10 view limit because the VStack contains only two views – two groups.
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