SwiftUI equatable view optimization

user_682466 0
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I'm following the steps in this article to improve SwiftUI performance with custom diffing. For now, I'm just returning true in ==:

struct MyView: View, Equatable {
   
   @ObservedObject var model: DataModel
   
   static func == (lhs: Self, rhs: Self) -> Bool {
       return true
   }

   var body: some View { ... lots of stuff ... }

}

I'm using .equatable() to wrap MyView in EquatableView where it's used.

However in the SwiftUI instrument, I still see the entire view rebuilt whenever DataModel changes. And the debugger confirms that body is called. == is also called.

My understanding is that body should not be called if == returns true when diffing. Is that correct?

How can I further investigate this?

swiftui swift macos
1 Answers

Try to make the view that conforms to Equatable without any dependencies like @ObservedObject. It should have plain properties.

user_2983680
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