Merge pull request #84 from ttub-nii/master

update: view border method

Author: jriosdev

iOSDropDown/Classes/iOSDropDown.swift

@@ -530,7 +530,16 @@ extension UIView {
         layer.shouldRasterize = true
         layer.rasterizationScale = scale ? UIScreen.main.scale : 1
     }
-
+    
+    func viewBorder(borderColor : UIColor, borderWidth : CGFloat?) {
+        self.layer.borderColor = borderColor.cgColor
+        if let borderWidth_ = borderWidth {
+            self.layer.borderWidth = borderWidth_
+        } else {
+            self.layer.borderWidth = 1.0
+        }
+    }
+    
     var parentViewController: UIViewController? {
         var parentResponder: UIResponder? = self
         while parentResponder != nil {