There is also dedicated subreddit for learning Objective-C: /r/learnobjectivecThere's too many to list them all, however here's a convenient link to all programming guides at apple.comTake note that this list is live and based on most frequent questions in posts will be updated with "quicklinks".Hello everyone, we present a working iOS App emulator for x86-based macOS here.In the year of 2021, Apple has unleashed ARM-based M1 chips for macintosh, making it much easier to run iOS Apps on PC-platform. Objective-C primer if you are new to the language and CocoaTouch frameworks. The Swift Programming Language also available as an iBook - new Apple's programming language for writing iOS and OS X applications (New posts asking this will be removed) Swift or Objective-C? if you don't know which language to choose.
Running Emulator For Iphone Code Is CapableWe modified and hacked a lot on the simulator, making it possbile to run ARM-based commerical iOS Apps released in AppStore inside iOS Simulator. The iOS Simulator that comes with Xcode is capable of running iOS Apps based on x86 instructions, which means you must own the source. When there was no working iOS emulator throughout the world, we decided to work one out for ourselves.The emulator runs on Intel x86-64 macOS/Xcode (This release works under Catalina).These changes are significantly hard to identify, making it impossible to do this part of ABI bridge. Under different instructions, the foundation framework, the memory layout of a class, the arrangement or implementation of virtual function table are slightly different. In order to do that, we hacked compiler of LLVM, scanning the whole SDK, generating all API parameter infomation, under which part of the ABI bridge may finally work.Nevertheless, the ABI includes not only c standards but also c++ ones.Dyld, the dynamic linker from Apple, does not support this. We must keep 2 copies of libc++.dylib in the memory, one is x86-64-based, the other one is ARM-based. The frameworks code from Apple, who is x86-64-based, also uses C++.We have re-compiled the libunwind for that.In addition to thoese, there were still many more problems for running the emulator on x86-64-based macOS. When an exception is thrown, the original unwinding logic does not work properly in searching the correct exception handler. There are both x86-64 and ARM function frames in the stack. The open source version of dyld is missing many important header files, compiling of which is much harder than we have expected, leaving us to the last option, binary matches to the dyld_sim (the dyld the simulator uses).C++ exception is another major problem we have encountered. Windows 7 vm image for macContrubitions can be made in case someone is interested. So we decided to open source the whole project. Now this project runs 2 apps from China successfully: WeChat and game Arena of Valor.Meanwhile, after Apple has unleashed ARM-based M1 and corresponding macOS, the necessity and the challenging of the project goes down. As the work goes on, the complexity of the whole emulation system has gone far beyond our expectation. The most challenged among which, is the massive reverse engineering in order to make iOS App run flawlessly.
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