Enable pull to refresh on timeline and change refresh indicator to better show when it is successfully pulled. Issue #1520

iOS/UIKit Extensions/AccountRefreshControl.swift

@@ -0,0 +1,51 @@
+//
+//  AccountRefreshControl.swift
+//  NetNewsWire-iOS
+//
+//  Created by Maurice Parker on 1/2/20.
+//  Copyright © 2020 Ranchero Software. All rights reserved.
+//
+
+import UIKit
+import Account
+
+class AccountRefreshControl: UIRefreshControl {
+
+	var errorHandler: ((Error) -> ())? = nil
+	
+	init(errorHandler: @escaping (Error) -> ()) {
+		super.init()
+		self.errorHandler = errorHandler
+		addTarget(self, action: #selector(refreshAccounts(_:)), for: .valueChanged)
+	}
+	
+	required init?(coder: NSCoder) {
+		fatalError()
+	}
+	
+	@objc func refreshAccounts(_ sender: Any) {
+				
+		let checkImageView = UIImageView(image: UIImage(systemName: "checkmark.circle.fill"))
+		checkImageView.tintColor = .label
+		checkImageView.translatesAutoresizingMaskIntoConstraints = false
+		addSubview(checkImageView)
+		NSLayoutConstraint.activate([
+			checkImageView.heightAnchor.constraint(equalToConstant: 35.0),
+			checkImageView.widthAnchor.constraint(equalToConstant: 35.0),
+			checkImageView.centerXAnchor.constraint(equalTo: centerXAnchor),
+			checkImageView.centerYAnchor.constraint(equalTo: centerYAnchor)
+		])
+		
+		DispatchQueue.main.asyncAfter(deadline: .now() + 0.33) {
+			self.endRefreshing()
+			checkImageView.removeFromSuperview()
+
+			// This is a hack to make sure that an error dialog doesn't interfere with dismissing the refreshControl.
+			// If the error dialog appears too closely to the call to endRefreshing, then the refreshControl never disappears.
+			DispatchQueue.main.asyncAfter(deadline: .now() + 0.5) {
+				AccountManager.shared.refreshAll(errorHandler: self.errorHandler!)
+			}
+		}
+	}
+	
+}