From d42269e5ab85ef2b4ea44ad0db3a841c3babcb8e Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Luis=20Valde=CC=81s?= <luis.valdes.cuesta@gmail.com>
Date: Thu, 2 Mar 2017 21:25:52 +0000
Subject: [PATCH] =?UTF-8?q?Add=20option=20to=20select=20a=20different=20ve?=
 =?UTF-8?q?rtical=20alignment=20for=20ButtonBar=E2=80=99s=20SelectedBar:?=
 =?UTF-8?q?=20top,=20middle=20or=20bottom=20(default).?=
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---
 .../ButtonBarPagerTabStripViewController.swift |  3 +++
 Sources/ButtonBarView.swift                    | 18 +++++++++++++++++-
 2 files changed, 20 insertions(+), 1 deletion(-)

diff --git a/Sources/ButtonBarPagerTabStripViewController.swift b/Sources/ButtonBarPagerTabStripViewController.swift
index cc44c7e..c93b45b 100644
--- a/Sources/ButtonBarPagerTabStripViewController.swift
+++ b/Sources/ButtonBarPagerTabStripViewController.swift
@@ -49,6 +49,7 @@ public struct ButtonBarPagerTabStripSettings {
 
         public var selectedBarBackgroundColor = UIColor.black
         public var selectedBarHeight: CGFloat = 5
+        public var selectedBarVerticalAlignment: SelectedBarVerticalAlignment = .bottom
         
         public var buttonBarItemBackgroundColor: UIColor?
         public var buttonBarItemFont = UIFont.systemFont(ofSize: 18)
@@ -147,6 +148,8 @@ open class ButtonBarPagerTabStripViewController: PagerTabStripViewController, Pa
         buttonBarView.selectedBar.backgroundColor = settings.style.selectedBarBackgroundColor
         
         buttonBarView.selectedBarHeight = settings.style.selectedBarHeight
+        buttonBarView.selectedBarVerticalAlignment = settings.style.selectedBarVerticalAlignment
+        
         // register button bar item cell
         switch buttonBarItemSpec! {
         case .nibFile(let nibName, let bundle, _):
diff --git a/Sources/ButtonBarView.swift b/Sources/ButtonBarView.swift
index ef8fd3b..e4fabe8 100644
--- a/Sources/ButtonBarView.swift
+++ b/Sources/ButtonBarView.swift
@@ -37,6 +37,12 @@ public enum SelectedBarAlignment {
     case progressive
 }
 
+public enum SelectedBarVerticalAlignment {
+    case top
+    case middle
+    case bottom
+}
+
 open class ButtonBarView: UICollectionView {
     
     open lazy var selectedBar: UIView = { [unowned self] in
@@ -50,6 +56,7 @@ open class ButtonBarView: UICollectionView {
             updateSelectedBarYPosition()
         }
     }
+    var selectedBarVerticalAlignment: SelectedBarVerticalAlignment = .bottom
     var selectedBarAlignment: SelectedBarAlignment = .center
     var selectedIndex = 0
     
@@ -167,7 +174,16 @@ open class ButtonBarView: UICollectionView {
     
     private func updateSelectedBarYPosition() {
         var selectedBarFrame = selectedBar.frame
-        selectedBarFrame.origin.y = frame.size.height - selectedBarHeight
+        
+        switch selectedBarVerticalAlignment {
+        case .top:
+            selectedBarFrame.origin.y = 0
+        case .middle:
+            selectedBarFrame.origin.y = (frame.size.height - selectedBarHeight) / 2
+        case .bottom:
+            selectedBarFrame.origin.y = frame.size.height - selectedBarHeight
+        }
+        
         selectedBarFrame.size.height = selectedBarHeight
         selectedBar.frame = selectedBarFrame
     }