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by ridiculous_fish
2095 days ago
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A SwiftUI view is a function which returns a strongly-typed value. Strongly-typed here is stronger than you may be familiar with, it's like `View<HStack<Button, Slider, TextField>>`. The whole view hierarchy has some type. You don't have to write these types because Swift can infer them. But when you write a view, you're really also stitching together a type. This explains some of the weird-feeling limitations, like no more than 10 subviews - since every possible count needs its own separate generic function! [1] Anyways the control flow constructs are needed so it can be encoded in the type. You need a way to say "I can be this type, or that type" at the type level - that's what _ConditionalContent encodes. Not a SwiftUI expert but that's my understanding. 1: https://developer.apple.com/documentation/swiftui/viewbuilde... |
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