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//
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// RouteComposer
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// Dismissible.swift
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// https://github.com/ekazaev/route-composer
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//
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// Created by Eugene Kazaev in 2018-2022.
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// Distributed under the MIT license.
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//
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// Become a sponsor:
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// https://github.com/sponsors/ekazaev
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//
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import Foundation
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import UIKit
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var associatedObjectHandle: UInt8 = 0
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/// `UIViewController` should conform to `Dismissible` protocol to be used with `DismissalMethodProvidingContextTask`.
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public protocol Dismissible where Self: UIViewController {
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// MARK: Associated types
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/// Type of instance that `Dismissible` `UIViewController` will provide on dismissal.
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associatedtype DismissalTargetContext
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// MARK: Properties to implement
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/// Property to store the dismissal block provided by `DismissalMethodProvidingContextTask`
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var dismissalBlock: ((_: DismissalTargetContext, _: Bool, _: ((_: RoutingResult) -> Void)?) -> Void)? { get set }
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}
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// MARK: Helper methods
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public extension Dismissible {
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/// Dismisses current `UIViewController` using dismissal block provided by `DismissalMethodProvidingContextTask`
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///
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/// - Parameters:
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/// - context: `DismissalTargetContext` required to be dismissed.
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/// - animated: Dismissal process should be animated if set to `true`
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/// - completion: The completion block.
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func dismissViewController(with context: DismissalTargetContext, animated: Bool, completion: ((_: RoutingResult) -> Void)? = nil) {
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guard let dismissalBlock else {
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let message = "Dismissal block has not been set."
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assertionFailure(message)
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completion?(.failure(RoutingError.compositionFailed(.init(message))))
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return
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}
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dismissalBlock(context, animated, completion)
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}
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}
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// MARK: Helper methods where the DismissalTargetContext is Any?
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public extension Dismissible where DismissalTargetContext == Any? {
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/// Dismisses current `UIViewController` using dismissal block provided by `DismissalMethodProvidingContextTask`
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///
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/// - Parameters:
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/// - animated: Dismissal process should be animated if set to `true`
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/// - completion: The completion block.
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func dismissViewController(animated: Bool, completion: ((_: RoutingResult) -> Void)? = nil) {
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dismissViewController(with: nil, animated: animated, completion: completion)
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}
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}
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// MARK: Helper methods where the DismissalTargetContext is Void
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public extension Dismissible where DismissalTargetContext == Void {
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/// Dismisses current `UIViewController` using dismissal block provided by `DismissalMethodProvidingContextTask`
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///
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/// - Parameters:
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/// - animated: Dismissal process should be animated if set to `true`
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/// - completion: The completion block.
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func dismissViewController(animated: Bool, completion: ((_: RoutingResult) -> Void)? = nil) {
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dismissViewController(with: (), animated: animated, completion: completion)
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}
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}
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/// `DismissibleWithRuntimeStorage` simplifies `Dismissible` protocol conformance implementing required
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/// `dismissalBlock` using Objective C runtime.
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public protocol DismissibleWithRuntimeStorage: Dismissible {}
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public extension DismissibleWithRuntimeStorage {
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var dismissalBlock: ((_: DismissalTargetContext, _: Bool, _: ((_: RoutingResult) -> Void)?) -> Void)? {
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get {
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objc_getAssociatedObject(self, &associatedObjectHandle) as? ((_: DismissalTargetContext, _: Bool, _: ((_: RoutingResult) -> Void)?) -> Void)
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}
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set {
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objc_setAssociatedObject(self, &associatedObjectHandle, newValue, .OBJC_ASSOCIATION_RETAIN_NONATOMIC)
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}
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}
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}
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