x/mobile/bind/testdata/testpkg: Readasset() fails in ios

[CanRui-Wu]

What version of Go are you using (go version)?

$ go version
go version go1.12.7 darwin/amd64

Does this issue reproduce with the latest release?

Yes

What operating system and processor architecture are you using (go env)?

go env Output

$ go env
GOARCH="amd64"
GOBIN=""
GOCACHE="/Users/wucanrui/Library/Caches/go-build"
GOEXE=""
GOFLAGS=""
GOHOSTARCH="amd64"
GOHOSTOS="darwin"
GOOS="darwin"
GOPATH="/Users/wucanrui/go"
GOPROXY=""
GORACE=""
GOROOT="/usr/local/Cellar/go/1.12.7/libexec"
GOTMPDIR=""
GOTOOLDIR="/usr/local/Cellar/go/1.12.7/libexec/pkg/tool/darwin_amd64"
GCCGO="gccgo"
CC="clang"
CXX="clang++"
CGO_ENABLED="1"
GOMOD=""
CGO_CFLAGS="-g -O2"
CGO_CPPFLAGS=""
CGO_CXXFLAGS="-g -O2"
CGO_FFLAGS="-g -O2"
CGO_LDFLAGS="-g -O2"
PKG_CONFIG="pkg-config"
GOGCCFLAGS="-fPIC -m64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -fdebug-prefix-map=/var/folders/0_/j6m36l9s0psg9xm5ggt2_b680000gp/T/go-build235355928=/tmp/go-build -gno-record-gcc-switches -fno-common"

What did you do?

gomobile bind -target=ios golang.org/x/mobile/bind/testdata/testpkg
And then use the testpkgReadasset by using testpkg.Framework.

What did you expect to see?

Everything is ok.

What did you see instead?

Cannot find assets/hello.txt

[katiehockman]

@CanRui-Wu Thanks for filing an issue! Can you provide some more details about the error that you got, and provide a full example that can easily reproduce this for investigation?

[CanRui-Wu]

@CanRui-Wu Thanks for filing an issue! Can you provide some more details about the error that you got, and provide a full example that can easily reproduce this for investigation?

All I have did are just run 'gomobile bind -target=ios golang.org/x/mobile/bind/testdata/testpkg' . And then drag the 'Testpkg.Framework' into Xcode.

I use it in an ios simulator and then get an error.

However, I run 'gomobile bind -target=android golang.org/x/mobile/bind/testdata/testpkg' and it work in android.

It seem that 'golang.org/x/mobile/cmd/gomobile/bind_iosapp.go' does not handle the assets subdirectory at all. In contrast, 'golang.org/x/mobile/cmd/gomobile/bind_androidapp.go' does handle it.