Add customize timeline layout setting

iOS/Settings/TimelineCustomizerViewController.swift

@@ -0,0 +1,88 @@
+//
+//  TimelineCustomizerViewController.swift
+//  NetNewsWire-iOS
+//
+//  Created by Maurice Parker on 11/8/19.
+//  Copyright © 2019 Ranchero Software. All rights reserved.
+//
+
+import UIKit
+
+class TimelineCustomizerViewController: UIViewController {
+
+	@IBOutlet weak var iconSizeSliderContainerView: UIView!
+	@IBOutlet weak var iconSizeSlider: UISlider!
+	@IBOutlet weak var numberOfLinesSliderContainerView: UIView!
+	@IBOutlet weak var numberOfLinesSlider: UISlider!
+	
+	@IBOutlet weak var previewWidthConstraint: NSLayoutConstraint!
+	@IBOutlet weak var previewHeightConstraint: NSLayoutConstraint!
+	
+	@IBOutlet weak var previewContainerView: UIView!
+	var previewController: TimelinePreviewTableViewController {
+		return children.first as! TimelinePreviewTableViewController
+	}
+	
+	override func viewDidLoad() {
+        super.viewDidLoad()
+
+		iconSizeSliderContainerView.layer.cornerRadius = 12
+		numberOfLinesSliderContainerView.layer.cornerRadius = 12
+		
+		numberOfLinesSlider.value = Float(AppDefaults.timelineNumberOfLines)
+		iconSizeSlider.value = Float(AppDefaults.timelineIconSize.rawValue)
+    }
+	
+	override func viewWillAppear(_ animated: Bool) {
+		super.viewDidAppear(animated)
+		updatePreviewBorder()
+		updatePreview()
+	}
+	
+	override func traitCollectionDidChange(_ previousTraitCollection: UITraitCollection?) {
+		updatePreviewBorder()
+		updatePreview()
+	}
+
+	@IBAction func iconSizeChanged(_ sender: Any) {
+		guard let iconSize = MasterTimelineIconSize(rawValue: Int(iconSizeSlider.value)) else { return }
+		AppDefaults.timelineIconSize = iconSize
+		updatePreview()
+	}
+	
+	@IBAction func numberOfLinesChanged(_ sender: Any) {
+		AppDefaults.timelineNumberOfLines = Int(numberOfLinesSlider.value)
+		updatePreview()
+	}
+	
+}
+
+// MARK: Private
+
+private extension TimelineCustomizerViewController {
+	
+	func updatePreview() {
+		let previewWidth: CGFloat = {
+			if traitCollection.userInterfaceIdiom == .phone {
+				return view.bounds.width
+			} else {
+				return view.bounds.width / 1.5
+			}
+		}()
+		
+		previewWidthConstraint.constant = previewWidth
+		previewHeightConstraint.constant = previewController.heightFor(width: previewWidth)
+		
+		previewController.reload()
+	}
+	
+	func updatePreviewBorder() {
+		if traitCollection.userInterfaceStyle == .dark {
+			previewContainerView.layer.borderColor = UIColor.black.cgColor
+			previewContainerView.layer.borderWidth = 1
+		} else {
+			previewContainerView.layer.borderWidth = 0
+		}
+	}
+	
+}