在iOS框架中使用RealmSwift：多数符号可找到但部分缺失

我正在构建一个集成RealmSwift源码的iOS框架（同时支持.framework和.xcframework），发现仅使用Realm API的子集时，框架可正常构建并在App中运行，但调用部分API会触发运行时符号未找到错误。

例如，打开数据库、添加数据、查询数据等操作都能正常执行，但引用Results对象的相关属性时，会抛出如下错误：

dyld[11749]: Symbol not found:
_$s10RealmSwift7ResultsVyxGSlAASl5countSivgTW

示例代码 #

框架内核心代码 #

public class ObjectA: Object, Codable {
    @objc dynamic var category: String  = ""
    
    override public static func primaryKey() -> String? {
        return "category"
    }
}

public func addA(key:String) {
    do {
        let objectA = ObjectA()
        objectA.category = key
        
        let realm = try Realm(configuration: configuration!)
        try? realm.write {
            realm.add(objectA, update: Realm.UpdatePolicy.all)
        }
    } catch let error as NSError {
        NSLog(TAG + "ERROR calling add() \(error.code)  \(error.description)")
    }
}

public func getAllAs() -> Results<ObjectA> {
    let realm = try! Realm(configuration: configuration!)
    let items = realm.objects(ObjectA.self)
    return items
}

App端调用代码 #

RealmDatabase.instance().addA(key: "something") // 正常运行
let found = RealmDatabase.instance().findObjectA(key: "something") // 正常运行
let allA = RealmDatabase.instance().getAllAs() // 正常运行
let c = allA.count // 触发错误

注：若App代码包含最后一行则触发错误，省略则可正常运行。

构建配置 #

框架的Podfile配置 #

target 'TheFramework' do
  use_frameworks!
  pod 'Realm', '10.49.1'
  pod 'RealmSwift', '10.49.1'
end

post_install do |installer|
  installer.pods_project.targets.each do |target|
    target.build_configurations.each do |config|
      config.build_settings['IPHONEOS_DEPLOYMENT_TARGET'] = '16.0'
      config.build_settings['BUILD_LIBRARY_FOR_DISTRIBUTION'] = 'YES'
    end
  end
end

App的Podfile配置 #

target 'ReferenceApp' do
  project 'ReferenceApp.xcodeproj'
  use_frameworks!
  pod 'Realm', '10.49.1'
  pod 'RealmSwift', '10.49.1'
end

post_install do |installer|
  installer.pods_project.targets.each do |target|
    target.build_configurations.each do |config|
      config.build_settings['IPHONEOS_DEPLOYMENT_TARGET'] = '16.0'
    end
  end
end

Xcode项目设置 #

• 框架项目：Pods.framework在Frameworks & Libraries中设置为Do Not Embed，Build library for distribution设为YES
• App项目：Pods.framework同样设置为Do Not Embed，自定义框架设置为Embed & Sign

核心疑问 #

为何能正常使用90%的Realm API，却有小部分API（如Results的count属性）触发符号未找到错误？

内容的提问来源于stack exchange，提问作者Piepants