This project implements encoding and decoding the "Quite OK Image" (QOI) format in the Objective-C and Clang. You can use the lib in Objective-C project directly by #import ZTQOIImage.h to read an .png/.qoi and encode/decode them.
For read and write .png.
A lot of iOS App based on Objective-C.I hope to make an Objective-C lib base on QOI.