swift – Methods to deal with GSJ02 and WGS84 coordinate system in ios MKMapview?

As I’ve achieved evaluation, i received to know china utilizing Gcj02 coordinate system.
so I’ve some douts on under situations

So in my ios app I’m utilizing MKMapview and exhibiting some location which I get in WGS84 format

1. If the placement which l get in response is for mainland China and we proven because it as for outdoor china person will it present appropriate location or not? Or that can be have to convert in Gcj02?
2. In identical case what is going to occur if person can be in mainland China(MKMapview will present as AMap) and site can be in mainland land china? Do we have to convert?
3. If person is exterior china and site can be exterior china then he can see appropriate location.
4. However when person in china(MKMapview will present as AMap) and site is exterior china? Will that location displayed accurately?

As there are some converter courses accessible for wgs to gcj or vice versa

As per above situations if I’ve to make use of each GCJ to WGS and WGS to GCJ, how will I get know location is during which format?

Thanks upfront in your assist!!!