Co-Occurrence on domain level

main/Requests/Analysis/VCAnalysisBar.swift

@@ -0,0 +1,60 @@
+import UIKit
+
+protocol AnalysisBarDelegate {
+	func analysisBarWillOpenCoOccurrence() -> (domain: String, isFQDN: Bool)
+}
+
+class VCAnalysisBar: UIViewController, UITabBarDelegate {
+	
+	@IBOutlet private var tabBar: UITabBar!
+	
+	override func viewDidLoad() {
+		if #available(iOS 10.0, *) {
+			tabBar.unselectedItemTintColor = .sysLink
+		}
+		super.viewDidLoad()
+	}
+	
+	override func willMove(toParent parent: UIViewController?) {
+		super.willMove(toParent: parent)
+		let enabled = (parent as? AnalysisBarDelegate) != nil
+		for item in tabBar.items! { item.isEnabled = enabled }
+	}
+	
+	// MARK: - Tab Bar Appearance
+	
+	override func viewWillAppear(_: Bool) {
+		resizeTableViewHeader()
+	}
+	
+	override func traitCollectionDidChange(_: UITraitCollection?) {
+		resizeTableViewHeader()
+	}
+	
+	func resizeTableViewHeader() {
+		guard let tableView = (parent as? UITableViewController)?.tableView,
+			let head = tableView.tableHeaderView else { return }
+		// Recalculate and apply new height. Otherwise tabBar won't compress
+		tabBar.sizeToFit()
+		head.frame.size.height = tabBar.frame.height
+		tableView.tableHeaderView = head
+	}
+	
+	// MARK: - Tab Bar Delegate
+	
+	func tabBar(_ tabBar: UITabBar, didSelect item: UITabBarItem) {
+		tabBar.selectedItem = nil
+		openCoOccurrence()
+	}
+	
+	private func openCoOccurrence() {
+		guard let delegate = parent as? AnalysisBarDelegate,
+			let vc = storyboard?.instantiateViewController(withIdentifier: "IBCoOccurrence") as? VCCoOccurrence else {
+			return
+		}
+		let info = delegate.analysisBarWillOpenCoOccurrence()
+		vc.domainName = info.domain
+		vc.isFQDN = info.isFQDN
+		present(vc, animated: true)
+	}
+}