Added initial POC version of NetNewsWire for iOS to use as a starting point for the actual app.

iOS/Master/Cell/MasterUnreadCountView.swift

@@ -0,0 +1,107 @@
+//
+//  MasterUnreadCountView.swift
+//  NetNewsWire
+//
+//  Created by Brent Simmons on 11/22/15.
+//  Copyright © 2015 Ranchero Software, LLC. All rights reserved.
+//
+
+import UIKit
+
+private let padding = UIEdgeInsets(top: 1.0, left: 7.0, bottom: 1.0, right: 7.0)
+private let cornerRadius = 8.0
+private let bgColor = UIColor.darkGray
+private let textColor = UIColor.white
+private let textFont = UIFont.systemFont(ofSize: 11.0, weight: UIFont.Weight.semibold)
+private var textAttributes: [NSAttributedString.Key: AnyObject] = [NSAttributedString.Key.foregroundColor: textColor, NSAttributedString.Key.font: textFont, NSAttributedString.Key.kern: NSNull()]
+private var textSizeCache = [Int: CGSize]()
+
+class MasterUnreadCountView : UIView {
+	
+	var unreadCount = 0 {
+		didSet {
+			invalidateIntrinsicContentSize()
+			setNeedsDisplay()
+		}
+	}
+	
+	var unreadCountString: String {
+		return unreadCount < 1 ? "" : "\(unreadCount)"
+	}
+
+	private var intrinsicContentSizeIsValid = false
+	private var _intrinsicContentSize = CGSize.zero
+
+	override init(frame: CGRect) {
+		super.init(frame: frame)
+		self.isOpaque = false
+	}
+	
+	required init?(coder aDecoder: NSCoder) {
+		super.init(coder: aDecoder)
+		self.isOpaque = false
+	}
+	
+	override var intrinsicContentSize: CGSize {
+		if !intrinsicContentSizeIsValid {
+			var size = CGSize.zero
+			if unreadCount > 0 {
+				size = textSize()
+				size.width += (padding.left + padding.right)
+				size.height += (padding.top + padding.bottom)
+			}
+			_intrinsicContentSize = size
+			intrinsicContentSizeIsValid = true
+		}
+		return _intrinsicContentSize
+	}
+	
+	override func invalidateIntrinsicContentSize() {
+		intrinsicContentSizeIsValid = false
+	}
+
+	private func textSize() -> CGSize {
+
+		if unreadCount < 1 {
+			return CGSize.zero
+		}
+
+		if let cachedSize = textSizeCache[unreadCount] {
+			return cachedSize
+		}
+
+		var size = unreadCountString.size(withAttributes: textAttributes)
+		size.height = ceil(size.height)
+		size.width = ceil(size.width)
+
+		textSizeCache[unreadCount] = size
+		return size
+		
+	}
+
+	private func textRect() -> CGRect {
+
+		let size = textSize()
+		var r = CGRect.zero
+		r.size = size
+		r.origin.x = (bounds.maxX - padding.right) - r.size.width
+		r.origin.y = padding.top
+		return r
+		
+	}
+
+	override func draw(_ dirtyRect: CGRect) {
+
+		let cornerRadii = CGSize(width: cornerRadius, height: cornerRadius)
+		let path = UIBezierPath(roundedRect: bounds, byRoundingCorners: .allCorners, cornerRadii: cornerRadii)
+		bgColor.setFill()
+		path.fill()
+
+		if unreadCount > 0 {
+			unreadCountString.draw(at: textRect().origin, withAttributes: textAttributes)
+		}
+		
+	}
+	
+}
+