Post

stackotter
@stackotter.dev

SwiftCrossUI's AndroidBackend has been hanging for a few hundred milliseconds after each view update, so Beberka collected a flame graph to investigate. It turns out, Android's RelativeLayout view measures each child twice per measurement pass, leading to exponential time complexity when nested!

stackotter
@stackotter.dev

Switching to a custom ViewGroup implementation brought the offending measurement pass from ~400ms down to ~7ms; github.com/moreSwift/sw...

github.comAndroidBackend: Switch to custom container (RelativeLayout too slow) by stackotter · Pull Request #550 · moreSwift/swift-cross-uiRelativeLayout's onMeasure implementation has a branching factor of 2, leading to Android's measurement pass being exponential with regard to the depth of the SwiftCrossUI view hierarchy. T...

0 reposts2 likes

No replies yet.