Updates from PR comments.

Action.podspec

@@ -21,8 +21,8 @@ Pod::Spec.new do |s|
   s.source_files  = "*.{swift}"
 
   s.frameworks  = "Foundation"
-  s.dependency "RxSwift", 'develop'
-  s.dependency "RxCocoa", 'develop'
+  s.dependency "RxSwift", '~> 2.6'
+  s.dependency "RxCocoa", '~> 2.6'
 
   s.watchos.exclude_files = "UIButton+Rx.swift", "UIBarButtonItem+Action.swift", "AlertAction.swift"
   s.osx.exclude_files = "UIButton+Rx.swift", "UIBarButtonItem+Action.swift", "AlertAction.swift"

Action.swift

@@ -65,10 +65,8 @@ public final class Action<Input, Element> {
     fileprivate let executingQueue = DispatchQueue(label: "com.ashfurrow.Action.executingQueue", attributes: [])
     fileprivate let disposeBag = DisposeBag()
 
-    public init<B: ExpressibleByBooleanLiteral>(enabledIf: Observable<B> = Observable.just(true), workFactory: @escaping WorkFactory) {
-        self._enabledIf = enabledIf.map { (booleanLiteral) -> Bool in
-            return booleanLiteral as! Bool
-        }
+    public init(enabledIf: Observable<Bool> = Observable.just(true), workFactory: @escaping WorkFactory) {
+        self._enabledIf = enabledIf
 
         self.workFactory = workFactory
 
@@ -78,7 +76,7 @@ public final class Action<Input, Element> {
 
         self.inputs.subscribe(onNext: { [weak self] (input) in
             self?._execute(input)
-        }, onError: nil, onCompleted: nil, onDisposed: nil).addDisposableTo(disposeBag)
+        }).addDisposableTo(disposeBag)
     }
 }
 
@@ -129,7 +127,7 @@ public extension Action {
         guard startedExecuting else {
             let error = ActionError.notEnabled
             self._errors.onNext(error)
-            buffer.onError(error as Error)
+            buffer.onError(error)
 
             return buffer
         }

UIBarButtonItem+Action.swift

@@ -34,7 +34,7 @@ public extension UIBarButtonItem {
 
                     self.rx.tap.subscribe(onNext: { (_) in
                         action.execute()
-                    }, onError: nil, onCompleted: nil, onDisposed: nil)
+                    })
                     .addDisposableTo(self.actionDisposeBag)
                 }
             }

UIButton+Rx.swift

@@ -49,7 +49,7 @@ public extension UIButton {
                     controlEvent
                         .subscribe(onNext: {
                             action.execute()
-                        }, onError: nil, onCompleted: nil, onDisposed: nil)
+                        })
                         .addDisposableTo(self.actionDisposeBag)
                 }
             }