Optimize Pngs

[yaliashkevich]

I've been migrating from classic xamarin to dotnet ios recently and noticed that pngcrushing of images under /Resources is not happening anymore.

Looks like it (_OptimizePngImages target) is turned off for sdk style project. Is it any way to enable it?

https://github.com/xamarin/xamarin-macios/blob/dc90060cfa1c106dc6b8cc2811da9d71e0480207/msbuild/Xamarin.Shared/Xamarin.iOS.Common.targets#L33-L50

[rolfbjarne]

This looks like an oversight; I'll have to investigate a bit.

In the meantime, something like this in your csproj might do it:

<PropertyGroup>
    <BuildDependsOn>
        $(BuildDependsOn);
		_OptimizePngImages;
	</BuildDependsOn>
</BuildDependsOn>

[rolfbjarne]

I've filed #20129 to look into this + a couple of other targets we're missing in .NET, so I'm closing this as a duplicate of that issue.

Thanks for your report! Please let us know if you run into any problems with the workaround.