Add: configureLayout method to InitializeableView protocol and all implementations.

Update: GeneralDataLoadingViewModel now can handle state changes and result of data source. Previously it was possible only in view controller.
Add: GeneralDataLoadingHandler protocol, that defines methods for common data loading states handling.
Add: resultObservable and resultDriver properties to GeneralDataLoadingViewModel.
Add: hidesWhenStopped option to SpinnerView, so you can stop animation without hiding image inside it.
Update: Migrate to Swift 4.2 & Xcode 10. Update dependencies.

Sources/Classes/DataLoading/GeneralDataLoading/GeneralDataLoadingViewModel.swift

@@ -23,7 +23,8 @@
 import RxSwift
 import RxCocoa
 
-open class GeneralDataLoadingViewModel<ResultType>: BaseViewModel {
+/// ViewModel that loads data from given data source with loading state tracking.
+open class GeneralDataLoadingViewModel<ResultType>: BaseViewModel, GeneralDataLoadingHandler, DisposeBagHolder {
 
     public typealias LoadingModel = GeneralDataLoadingModel<ResultType>
     public typealias DataSourceType = Single<ResultType>
@@ -33,6 +34,8 @@ open class GeneralDataLoadingViewModel<ResultType>: BaseViewModel {
 
     private let loadingStateRelay = BehaviorRelay<LoadingState>(value: .initial)
 
+    // MARK: - DisposeBagHolder
+
     public let disposeBag = DisposeBag()
 
     /// Initializer with single result sequence and empty result checker closure.
@@ -53,6 +56,8 @@ open class GeneralDataLoadingViewModel<ResultType>: BaseViewModel {
             .drive(loadingStateRelay)
             .disposed(by: disposeBag)
 
+        bindLoadingState(from: loadingStateDriver)
+
         loadingModel.reload()
     }
 
@@ -106,4 +111,22 @@ open class GeneralDataLoadingViewModel<ResultType>: BaseViewModel {
         loadingModel.reload()
     }
 
+    // MARK: - GeneralDataLoadingHandler
+
+    open func onLoadingState() {
+        // override in subclass
+    }
+
+    open func onResultsState(result: ResultType) {
+        // override in subclass
+    }
+
+    open func onEmptyState() {
+        // override in subclass
+    }
+
+    open func onErrorState(error: Error) {
+        // override in subclass
+    }
+
 }