Create an iOS (iPhone and iPad) app that allows the user to fake the current GPS location. The user should be able to enter an address as text or set the location on a world map. The location that has been set by the user should automatically be shown in other apps, such as Tinder, which are allowed to receive information about the location.
The design can be as simple as possible. Concerning the world map, you can use any third party map application that is free and easy to include.
Similar Fake GPS apps exist for Android, but apparently not for iOS.