Fix bug when user uses interactive transitioning first

Olga Konoreva · Olga Konoreva · commit fa5f2d69d0bd · 2017-06-02T15:45:02.000+06:00
diff --git a/Sources/MenuAnimator.swift b/Sources/MenuAnimator.swift
@@ -448,10 +448,10 @@ class MenuInteractiveTransition: NSObject, UIViewControllerInteractiveTransition
                 }
                 
             case .changed:
-                guard let transitionContext = transitionContext else {
-                    fatalError("Invalid transitionContext value. This property should not be nil")
-                }
                 if transitionStarted && (present && dx > 0 || !present && dx < 0) {
+                    guard let transitionContext = transitionContext else {
+                        fatalError("Invalid transitionContext value. This property should not be nil")
+                    }
                     updateTransition(percentComplete: progress)
                     transitionContext.updateInteractiveTransition(progress)
                 }

Original file line number	Diff line number	Diff line change
`@@ -448,10 +448,10 @@ class MenuInteractiveTransition: NSObject, UIViewControllerInteractiveTransition`
`448`	`448`	`}`
`449`	`449`
`450`	`450`	`case .changed:`
`451`		`- guard let transitionContext = transitionContext else {`
`452`		`- fatalError("Invalid transitionContext value. This property should not be nil")`
`453`		`- }`
`454`	`451`	`if transitionStarted && (present && dx > 0 \|\| !present && dx < 0) {`
	`452`	`+ guard let transitionContext = transitionContext else {`
	`453`	`+ fatalError("Invalid transitionContext value. This property should not be nil")`
	`454`	`+ }`
`455`	`455`	`updateTransition(percentComplete: progress)`
`456`	`456`	`transitionContext.updateInteractiveTransition(progress)`
`457`	`457`	`}`