Why SwiftUI Limited `@ViewBuilder` parameters count to 10?

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@available(iOS 13.0, macOS 10.15, tvOS 13.0, watchOS 6.0, *)
extension ViewBuilder {

    public static func buildBlock<C0, C1, C2, C3, C4, C5, C6, C7, C8, C9>(_ c0: C0, _ c1: C1, _ c2: C2, _ c3: C3, _ c4: C4, _ c5: C5, _ c6: C6, _ c7: C7, _ c8: C8, _ c9: C9) -> TupleView<(C0, C1, C2, C3, C4, C5, C6, C7, C8, C9)> where C0 : View, C1 : View, C2 : View, C3 : View, C4 : View, C5 : View, C6 : View, C7 : View, C8 : View, C9 : View
}

In the source code, ViewBuilder max parameters was limited to 10.

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1 Answers

Sadly variadic generics are not yet supported, so it was not possible to declare this function with a variadic input arguments (which means that you could pass in any number of input arguments).

Most probably 10 seemed like a good rule of thumb, since if you need more subviews, you can always break up your view builder into several smaller functions.

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