swiftui - @ViewBuilder 在属性上与 init 中，存储闭包或结果值

Question

有什么区别:

属性上的@ViewBuilder

struct SomeView<Content:View>: View {
    @ViewBuilder var content: () -> Content
}

在init中，存储闭包

struct SomeView2<Content:View>: View {
    var content: () -> Content
    
    init(@ViewBuilder content: @escaping () -> Content) {
        self.content = content
    }
}

在init中，存储结果值

struct SomeView3<Content:View>: View {
    var content: Content
    
    init(@ViewBuilder content: () -> Content) {
        self.content = content()
    }
}

所有解决方案似乎都有效。那么为什么人们会选择其中一种而不是另一种呢？

Answer 1

有人在今年的休息室询问，一位 Apple 工程师建议存储结果值。

Q: But, what’s the recommended way to use a @ViewBuilder for customcomponents: calling it right away in the init() and storing the view,or calling it later inside the body and storing the view builderitself?

A: We’d generally recommend resolving it right away andstoring the view

https://onmyway133.com/posts/wwdc-swiftui-lounge/#use-viewbuillder

例如这个版本

struct SomeView3<Content:View>: View {
    let content: Content
    
    init(@ViewBuilder content: () -> Content) {
        self.content = content()
    }
}