I have several subprojects within a single Xcode project, and I need to merge two of them that are quite similar. These two subprojects share about 80% of their files, but there are also differences in the remaining 20% of the files. I want to consolidate these two subprojects into one and reuse the shared files efficiently.

Here’s what I need help with:

• Copying Targets: Each project has several targets. What is the best way to move targets from one subproject to another within the same Xcode project, including transferring all build settings and configurations?

• Reusing Shared Files: How can I effectively manage and reuse files that are common between the two subprojects, and handle the differences in the remaining files?

• Adjusting Build Settings: What steps should I follow to ensure that the build settings from the source subproject are correctly applied to the merged subproject?

Also I am not sure what would be a good way to handle variables that differ per target. I have two files currently, that are literally the same, they just differ by some variable (some setting, that is defined per target.) So I want to use one file, instead of two and to set that variable appropriately per target. I have two ways in my mind. So, the first way would be to use “flags”:

// SharedFile.swift
#if TARGET_ONE
let variableA = "123"
#elseif TARGET_TWO
let variableA = "345"
#endif

And the other way would be to use configuration files:

// SharedFile.swift
let variableA: String = {
    if let path = Bundle.main.path(forResource: "Config", ofType: "plist"),
       let dict = NSDictionary(contentsOfFile: path),
       let value = dict["variableA"] as? String {
        return value
    }
    return "default"
}()

I never done run into these requirements so I am not sure what is the way to go, and I would appreciate any advice about how handle this whole process. Thanks in advance for your help!