PSPDFKitUI.framework are distributed as fat frameworks for Carthage. These frameworks contain two architectures:
x86_64. The ARM architecture is for devices, while the
x86_64 architecture is for the Simulator.
If these slices aren’t removed, Apple will reject the binary. Xcode will emit an error that says: “iTunes Store Operation Failed: Unsupported Architectures. The executable YourApp contains unsupported architectures ‘[(x86_64, i386)]’.” There might be additional errors, such as “LC_ENCRYPTION_INFO,” “Invalid Segment Alignment,” or “The binary is invalid.” Removing Simulator architectures resolves these issues.
You can manually strip the framework to remove slices not required for the app:
lipo -remove x86_64 -output PSPDFKit.framework/PSPDFKit PSPDFKit.framework/PSPDFKit lipo -remove x86_64 -output PSPDFKitUI.framework/PSPDFKitUI PSPDFKitUI.framework/PSPDFKitUI
You can verify that the architectures are removed via
PSPDFKit phased out armv7s support with PSPDFKit 4 for iOS.
Find out more about bitcode and framework size.