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iOS Cell Registration & Reusing with Swift Protocol Extensions and Generics

A common task when developing iOS apps is to register custom cell subclasses for both UITableView and UICollectionView. Well, that is if you don’t use Storyboards, of course.

Both UITableView and UICollectionView offer a similar API to register custom cell classes:

public func registerClass(cellClass: AnyClass?, forCellWithReuseIdentifier identifier: String)
public func registerNib(nib: UINib?, forCellWithReuseIdentifier identifier: String)

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Copyright 2017 Guillermo Gonzalez

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE U

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/// A type that has an "empty" representation.
public protocol EmptyRepresentable {
  static func empty() -> Self
}

extension Array: EmptyRepresentable {
  public static func empty() -> Array<Element> {
    return Array()
  }
}

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public extension KeyedDecodingContainer {
	func decode(_ type: URL.Type, forKey key: KeyedDecodingContainer.Key) throws -> URL {
		let stringValue = try decode(String.self, forKey: key)
		guard let url = URL(string: stringValue.trimmingWhiteSpace) else {
			throw DecodingError.dataCorruptedError(forKey: key, in: self, debugDescription: "Invalid URL string.")
		}
		return url
	}

	func decodeIfPresent(_ type: URL.Type, forKey key: KeyedDecodingContainer.Key) throws -> URL? {

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import Foundation

struct ImageAttachment: Codable {
    let url: URL
    let width: Int
    let height: Int
}

struct AudioAttachment: Codable {
    let title: String

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class SearchResultsViewController: UITableViewController {
    
    // MARK: - Properties
    
    private let viewModel: SearchResultsViewModelType
    private let disposeBag = DisposeBag()
    
    // MARK: - Initialization
    
    init(viewModel: SearchResultsViewModelType = SearchResultsViewModel()) {

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class FileManager {
    struct StaticInstance {
        static var instance = FileManager()
    }
    
    class var defaultManager : FileManager {
        return StaticInstance.instance
    }
}

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find . -name "*.swift" | while read line; do unexpand -t 4 $line > $line.new; mv $line.new $line; done

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import Foundation

private class ValueTransformer: NSValueTransformer {
    let transform: (AnyObject?) -> (AnyObject?)
    
    init(transform: (AnyObject?) -> (AnyObject?)) {
        self.transform = transform
    }
    
    // MARK: NSValueTransformer

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Pod::Spec.new do |s|
  s.name         = "ReactiveCocoa"
  s.version      = "2.0.0dev"
  s.summary      = "A framework for composing and transforming sequences of values."
  s.homepage     = "https://github.com/blog/1107-reactivecocoa-is-now-open-source"
  s.author       = { "Josh Abernathy" => "josh@github.com" }
  s.source       = { :git => "https://github.com/ReactiveCocoa/ReactiveCocoa.git", :branch => '2.0-development' }
  s.license      = 'Simplified BSD License'
  s.description  = "ReactiveCocoa offers:\n"                                                               \
                   "1. The ability to compose operations on future data.\n"                                \