Make collapse delegate and datasource optional

This change was required due to reported amount of crashes causing by force unwrapped delegate

Increase version number

Update podspec file

Author: Kharauzov

CollapseTableView.podspec

@@ -6,7 +6,7 @@ s.ios.deployment_target = '10.0'
 s.name = "CollapseTableView"
 s.summary = "CollapseTableView enables to expand sections with cells inside."
 s.requires_arc = true
-s.version = "1.0.2"
+s.version = "1.0.3"
 s.license = { :type => "MIT", :file => "LICENSE" }
 s.author = { "Serhii Kharauzov" => "serhii.kharauzov@gmail.com" }
 s.homepage = "https://github.com/Kharauzov/CollapseTableView"

CollapseTableView.xcodeproj/project.pbxproj

@@ -477,10 +477,12 @@
 					"@executable_path/Frameworks",
 					"@loader_path/Frameworks",
 				);
+				MARKETING_VERSION = 1.0.3;
 				PRODUCT_BUNDLE_IDENTIFIER = sk.CollapseTableView;
 				PRODUCT_NAME = "$(TARGET_NAME:c99extidentifier)";
 				PROVISIONING_PROFILE_SPECIFIER = "";
 				SKIP_INSTALL = YES;
+				SUPPORTS_MACCATALYST = YES;
 				SWIFT_VERSION = 5.0;
 				TARGETED_DEVICE_FAMILY = "1,2";
 			};
@@ -503,10 +505,12 @@
 					"@executable_path/Frameworks",
 					"@loader_path/Frameworks",
 				);
+				MARKETING_VERSION = 1.0.3;
 				PRODUCT_BUNDLE_IDENTIFIER = sk.CollapseTableView;
 				PRODUCT_NAME = "$(TARGET_NAME:c99extidentifier)";
 				PROVISIONING_PROFILE_SPECIFIER = "";
 				SKIP_INSTALL = YES;
+				SUPPORTS_MACCATALYST = YES;
 				SWIFT_VERSION = 5.0;
 				TARGETED_DEVICE_FAMILY = "1,2";
 			};

CollapseTableView/Info.plist

@@ -15,7 +15,7 @@
 	<key>CFBundlePackageType</key>
 	<string>FMWK</string>
 	<key>CFBundleShortVersionString</key>
-	<string>1.0.2</string>
+	<string>$(MARKETING_VERSION)</string>
 	<key>CFBundleVersion</key>
 	<string>$(CURRENT_PROJECT_VERSION)</string>
 </dict>

CollapseTableView/Source/CollapseTableView.swift

@@ -10,9 +10,9 @@ import UIKit
 
 open class CollapseTableView: UITableView {
     ///
-    private weak var collapseDataSource: UITableViewDataSource!
+    private weak var collapseDataSource: UITableViewDataSource?
     ///
-    private weak var collapseDelegate: UITableViewDelegate!
+    private weak var collapseDelegate: UITableViewDelegate?
     /// Represents opened/closed states of tableView's sections.
     private(set) var sectionStates = [Bool]()
     /// Determines, if section's headerView can be clickable.
@@ -42,10 +42,10 @@ open class CollapseTableView: UITableView {
     }
 
     override open func forwardingTarget(for aSelector: Selector!) -> Any? {
-        if collapseDataSource.responds(to: aSelector) {
+        if collapseDataSource?.responds(to: aSelector) ?? false {
             return collapseDataSource
         }
-        if collapseDelegate.responds(to: aSelector) {
+        if collapseDelegate?.responds(to: aSelector) ?? false {
             return collapseDelegate
         }
         return nil
@@ -125,6 +125,9 @@ open class CollapseTableView: UITableView {
     }
 
     private func indexPathsForRowsInSectionAtIndex(_ sectionIndex: Int) -> [IndexPath]? {
+        guard let collapseDataSource = collapseDataSource else {
+            return nil
+        }
         if sectionIndex >= sectionStates.count {
             return nil
         }
@@ -148,7 +151,7 @@ open class CollapseTableView: UITableView {
 
 extension CollapseTableView: UITableViewDataSource {
     public func numberOfSections(in tableView: UITableView) -> Int {
-        let numberOfSections = collapseDataSource.numberOfSections?(in: tableView) ?? 0
+        let numberOfSections = collapseDataSource?.numberOfSections?(in: tableView) ?? 0
         while numberOfSections < sectionStates.count {
             sectionStates.removeAll()
         }
@@ -160,21 +163,21 @@ extension CollapseTableView: UITableViewDataSource {
 
     public func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
         if sectionStates[section] {
-            return collapseDataSource.tableView(tableView, numberOfRowsInSection: section)
+            return collapseDataSource?.tableView(tableView, numberOfRowsInSection: section) ?? 0
         }
         return 0
     }
 
     public func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
-        return collapseDataSource.tableView(tableView, cellForRowAt: indexPath)
+        return collapseDataSource?.tableView(tableView, cellForRowAt: indexPath) ?? UITableViewCell()
     }
 }
 
 // MARK: UITableViewDelegate
 
 extension CollapseTableView: UITableViewDelegate {
     public func tableView(_ tableView: UITableView, viewForHeaderInSection section: Int) -> UIView? {
-        guard let view = collapseDelegate.tableView?(tableView, viewForHeaderInSection: section) else {
+        guard let view = collapseDelegate?.tableView?(tableView, viewForHeaderInSection: section) else {
             return nil
         }
         if shouldHandleHeadersTap {