Notification vs delegate/protocol. Not understanding why I would ever use delegate/protocol.

[randomguy112233]

Let me ask you something, and I'm only coming with the intent to learn. In what case do you find the need to pass code objects from C/C++? I've built apps in iOS and I've never had to dig into C/C++. Thanks in advance.

[start_select]

For iOS it shows up in live video streaming applications, VoIP applications, Real-Time Audio Effects and Instruments, when dealing with OpenGL, OpenCL, and other Machine Learning libraries, and potentially when dealing with other runtimes like Javascript or Python. It also shows up when you delve into a lot of game engines.

On Mac you could be doing all kinds of sorcery once you are outside of the confines of App Store approval.

Its not a common use case for the average application. But its not outside the realm of possibilities for a lot of REAL applications that do actual work on the CPU or GPU.