Merge pull request #142 from wordpress-mobile/fix/140-nux-button-indicator-color

[Dark Mode] Update activity indicator color when button is disabled

Author: danielebogo

WordPressAuthenticator.podspec

@@ -1,6 +1,6 @@
 Pod::Spec.new do |s|
   s.name          = "WordPressAuthenticator"
-  s.version       = "1.10.0-beta.3"
+  s.version       = "1.10.0-beta.4"
   s.summary       = "WordPressAuthenticator implements an easy and elegant way to authenticate your WordPress Apps."
 
   s.description   = <<-DESC

WordPressAuthenticator/NUX/NUXButton.swift

@@ -8,8 +8,21 @@ import WordPressUI
         return activityIndicator.isAnimating
     }
 
+    open override var isEnabled: Bool {
+        didSet {
+            if #available(iOS 13, *) {
+                activityIndicator.color = isEnabled ? style.primaryTitleColor : style.secondaryTitleColor
+            }
+        }
+    }
+
     @objc let activityIndicator: UIActivityIndicatorView = {
-        let indicator = UIActivityIndicatorView(style: .white)
+        let indicator: UIActivityIndicatorView
+        if #available(iOS 13, *) {
+            indicator = UIActivityIndicatorView(style: .medium)
+        } else {
+            indicator = UIActivityIndicatorView(style: .white)
+        }
         indicator.color = WordPressAuthenticator.shared.style.primaryTitleColor
         indicator.hidesWhenStopped = true
         return indicator
@@ -69,7 +82,10 @@ import WordPressUI
     open override func awakeFromNib() {
         super.awakeFromNib()
         configureAppearance()
-        activityIndicator.style = .gray
+        guard #available(iOS 13, *) else {
+            activityIndicator.style = .gray
+            return
+        }
     }
 
     /// Setup: shorter reference for style