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Thomvis/onPreferenceChangeWorkAround.swift

Created February 6, 2020 13:17
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  1. Thomvis created this gist Feb 6, 2020.
    10 changes: 10 additions & 0 deletions onPreferenceChangeWorkAround.swift
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    Original file line number Diff line number Diff line change
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    content
    .onPreferenceChange(SizeKey.self, perform: { sizes in
    // this is not always called
    })
    .overlayPreferenceValue(SizeKey.self) { sizes in
    EmptyView().onAppear {
    // this is called more reliably
    // the view's id controls for which changes this is called
    }.id(sizes.map { $0.width*1000+$0.height })
    }