Fix that AnimatedImage on watchOS, does not stop animating when disappear and cause performance issue #29
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dreampiggy commented Oct 26, 2019
…age decoding and animation does not stop issue. Increase performance
…ot take effect issue
dreampiggy force-pushed the bugfix_watchOS_animatedimage_stop_when_disappear branch from 17af6d5 to 5582b33 Compare 
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I don't find any documentation about How a UIViewRepresentable or WKInterfaceObjectRepresentable can response to
onAppearoronDisappearBecauseUIViewRepresentablecan not override itself with view modifier, and no public API here.Previouslly there is a bug that watchOS does not behave correctly. (If we nagivate to detail page, list page animated images still animating and consume CPU)
One simple solution, create a extra wrapper for watchOS (which
View.bodyis just aAnimatedImageand configedonAppear,onDisappearto control animating). But I really don't want to do so, which looks suck. 🤮However, I found that when
onAppearoronDisappear, the view'supdateWKInterfaceObjectmethod will be called. So we can use this to detect current visibility. (Using internal UIView.window to detect)