Prevent item selection during closing animation (jjochen#234)

* add test for double tap on action item

* prevent items to be tapped during closing animation

Example/Tests/JJFloatingActionButtonSpec.swift

@@ -413,6 +413,23 @@ class JJFloatingActionButtonSpec: QuickSpec {
                             expect(actionCount).toEventually(equal(1))
                         }
                     }
+
+                    context("and item is tapped twice") {
+                        beforeEach {
+                            let item = actionButton.items[0]
+                            item.sendActions(for: .touchUpInside)
+                            item.sendActions(for: .touchUpInside)
+                        }
+
+                        it("closes") {
+                            expect(actionButton.buttonState) == .closing
+                            expect(actionButton.buttonState).toEventually(equal(.closed))
+                        }
+
+                        it("performs action once") {
+                            expect(actionCount).toEventually(equal(1))
+                        }
+                    }
                 }
 
                 context("and is closed animated") {

Sources/JJFloatingActionButton.swift

@@ -535,6 +535,10 @@ fileprivate extension JJFloatingActionButton {
     }
 
     @objc func itemWasTapped(sender: JJActionItem) {
+        guard buttonState == .open || buttonState == .opening else {
+            return
+        }
+
         if closeAutomatically {
             close()
         }