Fix facebook sample for ios
Fix facebook sample for ios

tinybearc/sdkbox-facebook-sample,wanghuan1115/sdkbox-facebook-sample,wanghuan1115/sdkbox-facebook-sample,wanghuan1115/sdkbox-facebook-sample,tinybearc/sdkbox-facebook-sample,tinybearc/sdkbox-facebook-sample,wanghuan1115/sdkbox-facebook-sample,tinybearc/sdkbox-facebook-sample,tinybearc/sdkbox-facebook-sample,wanghuan1115/sdkbox-facebook-sample,wanghuan1115/sdkbox-facebook-sample,tinybearc/sdkbox-facebook-sample,tinybearc/sdkbox-facebook-sample,wanghuan1115/sdkbox-facebook-sample