I'm making a game using SpriteKit and Swift, I have GameCenter working and keeping track of scores properly, but my question is can I include another category to keep high scores of in that same leaderboard, an example would be like if you were fishing to have a leaderboard that showed who caught the most leaderboard but in another tab show who caught the biggest fish?
You can set up numerous leaderboards for your app. For example, one leaderboard to track overall scores while also having leaderboards for individual levels. Just make sure each leaderboard has a unique function so not to confuse your players.