support setting cancel view's title color (#129)

Author: migrant

Source/ActionController.swift

@@ -362,6 +362,7 @@ open class ActionController<ActionViewType: UICollectionViewCell, ActionDataType
 
  let cancelButton = UIButton(frame: CGRect(x: 0, y: 0, width: 100, height: settings.cancelView.height))
  cancelButton.addTarget(self, action: #selector(ActionController.cancelButtonDidTouch(_:)), for: .touchUpInside)
+ cancelButton.setTitleColor(settings.cancelView.titleColor, for: UIControl.State())
  cancelButton.setTitle(settings.cancelView.title, for: UIControl.State())
  cancelButton.translatesAutoresizingMaskIntoConstraints = false
 

Source/ActionControllerSettings.swift

@@ -81,6 +81,10 @@ public struct ActionControllerSettings {
  * The cancel view's background color. Its default value is `UIColor.blackColor().colorWithAlphaComponent(0.8)`.
  */
  public var backgroundColor = UIColor.black.withAlphaComponent(0.8)
+ /**
+ * The cancel view's title color. Its default value is `UIColor.white`.
+ */
+ public var titleColor = UIColor.white
  /**
  * A Boolean value that determines whether the collection view can be partially covered by the 
  * cancel view when it is pulled down. Its default value is `true`