Call Published properties from an … | Apple Developer Forums

Call Published properties from an ObservableObject class in other classes in Swift

Hi, a Service class where I process all Core Data transactions for a single entity/Object and I often find my self needing to access information from other classes and I was wondering if there was an issue by calling these classes in non-UI related classes.

In the following code I'm calling the dogs array from the DogService class inside the DogHouseService class, and I was wondering if this could be an issue.

Are there any possible issue by calling @Published properties from an ObservableObject class inside other classes?

ObservableObject class

  class DogService: ObservableObject{
 
    let manager: CoreDataManager
 
    @Published var dogs: [Dog] = []
 
    init(coreDataManager: CoreDataManager = .instance){
      self.manager = coreDataManager
      loadDogs()
    }
 
    &#x2F;&#x2F;Adds, Deletes, Updates, etc.
 
    func loadDogs(){
      let request = NSFetchRequest&lt;Dog>(entityName: "Dog")
      do{
        dogs =  try manager.context.fetch(request)
      }catch let error{
        print("Error fetching dogs. \(error.localizedDescription)")
      }
    }
 
    func save(){
      self.manager.save()
    }
  }

Other Class

   class DogHouseService{
    let dogService = DogService()
 
    for dog in dogService.dogs{
      &#x2F;&#x2F; do something
    }
  }

	class DogService: ObservableObject{

	let manager: CoreDataManager

	@Published var dogs: [Dog] = []

	init(coreDataManager: CoreDataManager = .instance){
	self.manager = coreDataManager
	loadDogs()
	}

	//Adds, Deletes, Updates, etc.

	func loadDogs(){
	let request = NSFetchRequest<Dog>(entityName: "Dog")
	do{
	dogs = try manager.context.fetch(request)
	}catch let error{
	print("Error fetching dogs. \(error.localizedDescription)")
	}
	}

	func save(){
	self.manager.save()
	}
	}

	class DogHouseService{
	let dogService = DogService()

	for dog in dogService.dogs{
	// do something
	}
	}