我在编译时收到以下警告:Warnings:/Users/some-user/Projects/SomeApp/SomeApp/SomeApp.csproj(Build)->/Library/Frameworks/Mono.framework/External/xbuild/Xamarin/iOS/Xamarin.iOS.Common.targets(_CoreCompileImageAssetstarget)->Resources/Images.xcassets:actoolwarning:Theappiconset"AppIcons"has2unassignedchildren.1W