No, your source code is not retrievable, because your released app is made by compiling the source code into an executable -- it's not the source code any more -- and then the executable binary is encrypted. However, some resources such as images can be pulled from your device once the app is installed. See also Decompiling iOS Objective-C binaries

Feb 13, 2019 Zcash Releases Open-Source Code for Private-Only iOS and Jun 11, 2020 How to View Web Page Source Code on iPhone and iPad Feb 08, 2018

Not including backend code, Facebook runs on 62 million lines of code. With the advent of sophisticated, cloud-connected infotainment systems, the car software in a modern vehicle apparently uses 100 million lines of code. This is according to Wired magazine. All Google services combine for a …

Jul 26, 2020 Sell My Source Code - Buy and Sell iOS App, Android and 3D

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Oct 02, 2017 How to View Source Code of a Webpage in Safari on iPhone