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ObservableVIew 对 ForEach 不生效 #2

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@beforeold

看起来 ObserableVIew 的 tracking 是同步的 apply closure,而 ForEach 的构造器是 @escaping 的 ViewBuilder,将会被异步调用,这歌 ViewBuilder content 里面对 Obserable 对象的访问在 apply 时没有进入 accessList,导致失效。

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