在 SwiftUI 中有条件地使用视图

问题描述：

我正在尝试找出使用 swiftui 有条件地包含视图的正确方法.我无法直接在视图中使用 if 并且不得不使用堆栈视图来做到这一点.

I'm trying to figure out the correct way to conditionally include a view with swiftui. I wasn't able to use the if directly inside of a view and had to use a stack view to do it.

这可行，但似乎有更简洁的方法.

This works but there seems like there would be a cleaner way.

var body: some View {
    HStack() {
        if keychain.get("api-key") != nil {
            TabView()
        } else {
            LoginView()
        }
    }
}

答

避免使用像 HStack 这样的额外容器的最简单方法是将 body 属性注释为 @ViewBuilder，像这样:

The simplest way to avoid using an extra container like HStack is to annotate your body property as @ViewBuilder, like this:

@ViewBuilder
var body: some View {
    if user.isLoggedIn {
        MainView()
    } else {
        LoginView()
    }
}

在 SwiftUI 中有条件地使用视图

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