Apple Lossless Audio CODEC (ALAC), implemented the Touch Bar in the MacBook Pro as a change designed to "take the eyes" of users who thought that their laptops still needed something new and important. Of course, the Touch Bar is not something important for the MacBook Pro, but only something that users could easily live without, as the user experience is not improved.
A graphic designer who thought that the Touch Bar would be very useful in phones does not share the same opinion iPhone, so he made a concept that illustrates how it could be implemented. You can see the images below what the Touch Bar looks like in the iPhone interface and what it could offer for users who would have this functionality integrated into Apple's iOS.
I don't think that Apple will ever offer the Touch Bar in the iPhone, because it has nothing to bring new through it, and a good part of the screen would be covered by something that the world does not need. However, we will probably see jailbreak tweaks that could bring this functionality to the iPhone, it having a somewhat more useful role in the case of iPad tablets, however.
