migrate to swift 5

Author: llbartekll

CalendarDateRangePickerViewController/Classes/CalendarDateRangePickerCell.swift

@@ -67,7 +67,7 @@ class CalendarDateRangePickerCell: UICollectionViewCell {
         selectedView?.backgroundColor = selectedColor
         selectedView?.layer.cornerRadius = height / 2
         self.addSubview(selectedView!)
-        self.sendSubview(toBack: selectedView!)
+        self.sendSubviewToBack(selectedView!)
 
         label.textColor = UIColor.white
     }
@@ -79,7 +79,7 @@ class CalendarDateRangePickerCell: UICollectionViewCell {
         halfBackgroundView = UIView(frame: CGRect(x: width / 2, y: 0, width: width / 2, height: height))
         halfBackgroundView?.backgroundColor = highlightedColor
         self.addSubview(halfBackgroundView!)
-        self.sendSubview(toBack: halfBackgroundView!)
+        self.sendSubviewToBack(halfBackgroundView!)
 
         addRoundHighlightView()
     }
@@ -91,7 +91,7 @@ class CalendarDateRangePickerCell: UICollectionViewCell {
         halfBackgroundView = UIView(frame: CGRect(x: 0, y: 0, width: width / 2, height: height))
         halfBackgroundView?.backgroundColor = highlightedColor
         self.addSubview(halfBackgroundView!)
-        self.sendSubview(toBack: halfBackgroundView!)
+        self.sendSubviewToBack(halfBackgroundView!)
 
         addRoundHighlightView()
     }
@@ -103,7 +103,7 @@ class CalendarDateRangePickerCell: UICollectionViewCell {
         roundHighlightView?.backgroundColor = highlightedColor
         roundHighlightView?.layer.cornerRadius = height / 2
         self.addSubview(roundHighlightView!)
-        self.sendSubview(toBack: roundHighlightView!)
+        self.sendSubviewToBack(roundHighlightView!)
     }
 
     func highlight() {

CalendarDateRangePickerViewController/Classes/CalendarDateRangePickerViewController.swift

@@ -43,7 +43,7 @@ public class CalendarDateRangePickerViewController: UICollectionViewController {
         collectionView?.backgroundColor = UIColor.white
 
         collectionView?.register(CalendarDateRangePickerCell.self, forCellWithReuseIdentifier: cellReuseIdentifier)
-        collectionView?.register(CalendarDateRangePickerHeaderView.self, forSupplementaryViewOfKind: UICollectionElementKindSectionHeader, withReuseIdentifier: headerReuseIdentifier)
+        collectionView?.register(CalendarDateRangePickerHeaderView.self, forSupplementaryViewOfKind: UICollectionView.elementKindSectionHeader, withReuseIdentifier: headerReuseIdentifier)
         collectionView?.contentInset = collectionViewInsets
 
         if minimumDate == nil {
@@ -58,11 +58,11 @@ public class CalendarDateRangePickerViewController: UICollectionViewController {
         self.navigationItem.rightBarButtonItem?.isEnabled = selectedStartDate != nil && selectedEndDate != nil
     }
 
-    func didTapCancel() {
+    @objc func didTapCancel() {
         delegate.didCancelPickingDateRange()
     }
 
-    func didTapDone() {
+    @objc func didTapDone() {
         if selectedStartDate == nil || selectedEndDate == nil {
             return
         }
@@ -132,7 +132,7 @@ extension CalendarDateRangePickerViewController {
 
     override public func collectionView(_ collectionView: UICollectionView, viewForSupplementaryElementOfKind kind: String, at indexPath: IndexPath) -> UICollectionReusableView {
         switch kind {
-        case UICollectionElementKindSectionHeader:
+        case UICollectionView.elementKindSectionHeader:
             let headerView = collectionView.dequeueReusableSupplementaryView(ofKind: kind, withReuseIdentifier: headerReuseIdentifier, for: indexPath) as! CalendarDateRangePickerHeaderView
             headerView.label.text = getMonthLabel(date: getFirstDateForSection(section: indexPath.section))
             return headerView