Use folder references for all groups and sort files/folders

passKit/Extensions/String+Localization.swift

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+/*
+ String+Localization.swift
+ passKit
+
+ Created by Danny Moesch on 12.01.19.
+ Copyright © 2019 Bob Sun. All rights reserved.
+ */
+
+extension String {
+    public func localize() -> String {
+        return NSLocalizedString(self, value: "#\(self)#", comment: "")
+    }
+
+    public func localize(_ firstValue: CVarArg) -> String {
+        return String(format: localize(), firstValue)
+    }
+
+    public func localize(_ firstValue: CVarArg, _ secondValue: CVarArg) -> String {
+        return String(format: localize(), firstValue, secondValue)
+    }
+
+    public func localize(_ error: Error) -> String {
+        return localize(error.localizedDescription)
+    }
+}

passKit/Extensions/String+Utilities.swift

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+//
+//  String+Utilities.swift
+//  passKit
+//
+//  Created by Yishi Lin on 2018/9/23.
+//  Copyright © 2018 Bob Sun. All rights reserved.
+//
+
+extension String {
+    public var trimmed: String {
+        return trimmingCharacters(in: .whitespacesAndNewlines)
+    }
+
+    public func stringByAddingPercentEncodingForRFC3986() -> String? {
+        let unreserved = "-._~/?"
+        var allowed = CharacterSet.alphanumerics
+        allowed.insert(charactersIn: unreserved)
+        return addingPercentEncoding(withAllowedCharacters: allowed)
+    }
+}
+
+extension String {
+    public static func | (left: String, right: String) -> String {
+        return right.isEmpty ? left : left + "\n" + right
+    }
+}

passKit/Extensions/UITextFieldExtension.swift

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+//
+//  UITextFieldExtension.swift
+//  pass
+//
+//  Created by Yishi Lin on 5/4/17.
+//  Copyright © 2017 Yishi Lin. All rights reserved.
+//
+
+import Foundation
+import UIKit
+
+private var kAssociationKeyNextField: UInt8 = 0
+
+extension UITextField {
+    @IBOutlet var nextField: UITextField? {
+        get {
+            return objc_getAssociatedObject(self, &kAssociationKeyNextField) as? UITextField
+        }
+        set(newField) {
+            objc_setAssociatedObject(self, &kAssociationKeyNextField, newField, .OBJC_ASSOCIATION_RETAIN)
+        }
+    }
+}

passKit/Extensions/UIViewControllerExtension.swift

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+//
+//  UIViewControllerExtension.swift
+//  pass
+//
+//  Created by Yishi Lin on 5/4/17.
+//  Copyright © 2017 Yishi Lin. All rights reserved.
+//
+
+extension UIViewController {
+    @objc public func textFieldShouldReturn(_ textField: UITextField) -> Bool {
+        if textField.nextField != nil {
+            textField.nextField?.becomeFirstResponder()
+        } else {
+            textField.resignFirstResponder()
+        }
+        return true
+    }
+}

passKit/Extensions/UIViewExtension.swift

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+//
+//  UIViewExtension.swift
+//  passKit
+//
+//  Created by Yishi Lin on 2018/4/11.
+//  Copyright © 2018 Yishi Lin. All rights reserved.
+//
+
+import Foundation
+
+extension UIView {
+
+    // Save anchors: https://stackoverflow.com/questions/46317061/use-safe-area-layout-programmatically
+    var safeTopAnchor: NSLayoutYAxisAnchor {
+        if #available(iOS 11.0, *) {
+            return self.safeAreaLayoutGuide.topAnchor
+        } else {
+            return self.topAnchor
+        }
+    }
+
+    var safeLeftAnchor: NSLayoutXAxisAnchor {
+        if #available(iOS 11.0, *){
+            return self.safeAreaLayoutGuide.leftAnchor
+        } else {
+            return self.leftAnchor
+        }
+    }
+
+    var safeRightAnchor: NSLayoutXAxisAnchor {
+        if #available(iOS 11.0, *){
+            return self.safeAreaLayoutGuide.rightAnchor
+        } else {
+            return self.rightAnchor
+        }
+    }
+
+    var safeBottomAnchor: NSLayoutYAxisAnchor {
+        if #available(iOS 11.0, *) {
+            return self.safeAreaLayoutGuide.bottomAnchor
+        } else {
+            return self.bottomAnchor
+        }
+    }
+}