add progressView

GMERemittance/Extension/UIViewControllerExtension.swift

@@ -276,32 +276,53 @@ extension UIViewController {
   }
 }
 
+private var associatedObjectHandle: UInt8 = 0
 extension UIViewController {
-  private static var progressView = UIView(frame: CGRect(x: 0, y: 0, width: 0, height: 2))
+  private var progressView: UIView? {
+    get {
+      guard let view = objc_getAssociatedObject(self, &associatedObjectHandle) as? UIView else {
+        return nil
+      }
+      
+      return view
+    }
+    set {
+      objc_setAssociatedObject(self, &associatedObjectHandle, newValue, objc_AssociationPolicy.OBJC_ASSOCIATION_RETAIN_NONATOMIC)
+    }
+  }
   
   func setPercent(with percent: CGFloat) {
-    UIViewController.progressView.removeFromSuperview()
-    view.addSubview(UIViewController.progressView)
+    let progressSubView: UIView
+    
+    if let view = progressView {
+      progressSubView = view
+    } else {
+      progressSubView = UIView(frame: CGRect(x: 0, y: 0, width: 0, height: 2))
+      progressView = progressSubView
+    }
+    
+    progressSubView.removeFromSuperview()
+    view.addSubview(progressSubView)
     
     print("progress: \(percent)")
-    UIViewController.progressView.backgroundColor = AppConstants.themeRedColor
+    progressSubView.backgroundColor = AppConstants.themeRedColor
     let width = view.frame.width * percent
     
     UIView.animate(
       withDuration: 0.5,
       animations: {
-        UIViewController.progressView.frame = CGRect(x: 0, y: 0, width: width, height: 2)
+        progressSubView.frame = CGRect(x: 0, y: 0, width: width, height: 2)
     },
       completion: { _ in
         if width == self.view.frame.width {
           UIView.animate(
             withDuration: 0.2,
             animations: {
-              UIViewController.progressView.alpha = 0.0
+              progressSubView.alpha = 0.0
           },
             completion: { _ in
-              UIViewController.progressView.frame = CGRect(x: 0, y: 0, width: 0, height: 2)
-              UIViewController.progressView.alpha = 1.0
+              progressSubView.frame = CGRect(x: 0, y: 0, width: 0, height: 2)
+              progressSubView.alpha = 1.0
           })
         }
       }