If you want to mod your favorite iOS games, you can resort to an application of the likes of GameGem. With this app, you can modify certain parameters of your games, such as your score or number of lives.
Change the values of your iPhone games
It works similarly to applications that already exist for Android, such as Lucky Patcher. Once you run the app, you have to choose which running processes or applications you want to modify and provided this tool can get into them, you'll be able to apply modifications.
This tool also stands out for a really simple interface, much easier to use than the above-mentioned applications to patch Android games. However, you should know that although you can modify the values of many games, you won't be able to apply those patches to online titles.
In other words, if you're playing Clash of Clans, forget about changing your score or the value of certain attributes as the latter are saved on online servers which you can't access. GameGem only works with games the values of which are stored locally.