x/mobile: go_seq_go_to_refnum on objective-c objects is not permitted

[karalabe]

We've received a bug report that recently (2+ weeks at least) iOS builds have been erroring out with a strange error. Any ideas about it?

* Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'go_seq_go_to_refnum on objective-c objects is not permitted'

[sashabaranov]

Also experiencing this.

Happens to me when I manually instantiate golang's struct and then perform some actions with its internals.

MygolangObject* obj = [[MygolangObject alloc] init];
[obj setProperty:value]; // fails here

However it works if I introduce procedure to create objects in golang:

MygolangObject* obj = MygolangFunctionToCreateObject(property_value);
[obj setProperty:value]; // works!

[ArEnSc]

I don’t understand how this works can you clearify ? With a full example ?

[zgramana]

I noticed the error when I implemented the generated class declared by gomobile from my Go interface which included the _ref property. When I declared my own class and implemented the protocol which mapped directly to my Go interface (without _ref) it worked as expected.

[gabriel]

You can't use alloc/init to make a go struct.. You have to create a constructor in go code and call that.

No:

MyObject* obj = [[MyObject alloc] init];

Yes:

func NewMyObject() *MyObject {
  return &MyObject{...}
}

MyObject* obj = TheFrameworkNewMyObject();

[gopherbot]

Change https://golang.org/cl/51870 mentions this issue: bind: mark default ObjC initializer unavailable

[gopherbot]

Change https://golang.org/cl/52012 mentions this issue: bind: generate ObjC initializers