Manually invalidate NSKeyValueObservation to prevent iOS 10 crash

Sources/iOS/Editor.swift

@@ -171,6 +171,14 @@ open class Editor: View, Themeable {
    */
    */
   private var textViewTextObserver: NSKeyValueObservation!
   private var textViewTextObserver: NSKeyValueObservation!
 
 
+  deinit {
+    placeholderLabelTextObserver.invalidate()
+    placeholderLabelTextObserver = nil
+
+    textViewTextObserver.invalidate()
+    textViewTextObserver = nil
+  }
+
   open override func prepare() {
   open override func prepare() {
     super.prepare()
     super.prepare()
     backgroundColor = nil
     backgroundColor = nil

Sources/iOS/Toolbar.swift

@@ -81,6 +81,11 @@ open class Toolbar: Bar, Themeable {
     }
     }
   }
   }
 
 
+  deinit {
+    titleLabelTextAlignmentObserver.invalidate()
+    titleLabelTextAlignmentObserver = nil
+  }
+
   /**
   /**
    An initializer that initializes the object with a NSCoder object.
    An initializer that initializes the object with a NSCoder object.
    - Parameter aDecoder: A NSCoder instance.
    - Parameter aDecoder: A NSCoder instance.