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import UIKit

/**
 A drop-in replacement for the `UITableView`’s default section footer title, adding support for inline links. This class
 will call the same, single target/action pair for *all* inline links, regardless of what their `NSLinkAttributeName`
 values are. If you need to support multiple different inline links, this class is not for you.
 
 Instead of implementing `tableView(tableView:titleForFooterInSection:)` and returning a string, implement
 `tableView(tableView:, viewForFooterInSection section: Int)` and return an instance of this class.
 

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/**
 *  A class that can be part of a tabbed navigational interface (expected to be a `UIViewController` but can also be a 
 *  coordinator that proxies through to an underlying controller).
 */
public protocol TabComponent {
    /// The tab metadata
    var tabItem: TabItem { get }

    var viewController: UIViewController { get }
}

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protocol TextContaining {
    var isEmpty: Bool { get }
}

extension String: TextContaining {
}

extension Optional where Wrapped: TextContaining {
    var isEmpty: Bool {
        switch self {

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protocol Foo {
}

extension Foo {
    func bar() -> Self { return self }
}

extension NSObject: Foo {}

let view = UIView().bar() // Value of type `UIView` has no member `bar`

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import Foundation

/**
 Coordinators are a design pattern that encourages decoupling view controllers such that they know as little as possible 
 about how they are presented, and don’t directly manipulate data or present other view controllers. Coordinators can be 
 “nested” such that child coordinators encapsulate different flows and present any from becoming too large.
 
 - https://vimeo.com/144116310
 - http://khanlou.com/2015/10/coordinators-redux/
 - http://khanlou.com/2015/01/the-coordinator/

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1. When volume switch is On, phone both makes noise and vibrates.

2. When volume switch is Off, phone does not make noise or vibrate.

3. Calls should make noise/vibrate in extenuating cirumstances, e.g. a call from a favorite or two calls within three minutes.

Vibrate on Silent accomplishes 1 and 2, but prevents 3 from occurring.

3 could be accomplished by ignoring the volume switch altogether and using Do Not Disturb to solely determine whether my phone is silent or not. In this case, I would have DND turned on almost all of the time. The problem with this is that when the phone is unlocked/in use, notifications will either A) not be shown at all or B) will cause noise/vibration.

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final class CenteringView: UIView {
    // MARK: - Initialization
    
    init(contentView: UIView) {
        super.init(frame: .zero)
        
        addSubview(contentView)
        contentView.translatesAutoresizingMaskIntoConstraints = false
        
        NSLayoutConstraint.activateConstraints([

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struct ViewControllerSequence {
    typealias ViewControllerProducer = Void -> UIViewController

    private var storage = TypeDictionary<ViewControllerProducer>()

    private var producers: [ViewControllerProducer]

    init(_ producers: [ViewControllerProducer]) {
        self.producers = producers
    }

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protocol Validator {
    typealias ValidatedType
    
    func isValid(object: ValidatedType) -> Bool
}

struct NonEmptyValidator: Validator {
    func isValid(object: String) -> Bool {
        return object.isEmpty
    }

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Qualifies

Already had

• Accessibility
• Handoff
• Safari Shared Credentials
• iCloud Keychain
• iPad Multitasking
• State Restoration