Forked from BohdanOrlov/ViewControllerLifecycleBehavior.swift
Created
December 12, 2018 08:07
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Swift implementation of idea that manny view controller can do light work: http://khanlou.com/2016/02/many-controllers/
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public protocol ViewControllerLifecycleBehavior { | |
func afterLoading(_ viewController: UIViewController) | |
func beforeAppearing(_ viewController: UIViewController) | |
func afterAppearing(_ viewController: UIViewController) | |
func beforeDisappearing(_ viewController: UIViewController) | |
func afterDisappearing(_ viewController: UIViewController) | |
func beforeLayingOutSubviews(_ viewController: UIViewController) | |
func afterLayingOutSubviews(_ viewController: UIViewController) | |
} | |
extension ViewControllerLifecycleBehavior { | |
public func afterLoading(_ viewController: UIViewController) {} | |
public func beforeAppearing(_ viewController: UIViewController) {} | |
public func afterAppearing(_ viewController: UIViewController) {} | |
public func beforeDisappearing(_ viewController: UIViewController) {} | |
public func afterDisappearing(_ viewController: UIViewController) {} | |
public func beforeLayingOutSubviews(_ viewController: UIViewController) {} | |
public func afterLayingOutSubviews(_ viewController: UIViewController) {} | |
} | |
public extension UIViewController { | |
/* | |
Add behaviors to be hooked into this view controller’s lifecycle. | |
This method requires the view controller’s view to be loaded, so it’s best to call | |
in `viewDidLoad` to avoid it being loaded prematurely. | |
- parameter behaviors: Behaviors to be added. | |
*/ | |
public func add(behaviors: [ViewControllerLifecycleBehavior]) { | |
let behaviorViewController = LifecycleBehaviorViewController(behaviors: behaviors, behaviorsHost: self) | |
self.add(behaviorViewController: behaviorViewController) | |
} | |
private func add(behaviorViewController: LifecycleBehaviorViewController) { | |
self.addChildViewController(behaviorViewController) | |
self.view.addSubview(behaviorViewController.view) | |
behaviorViewController.didMove(toParentViewController: self) | |
} | |
} | |
fileprivate final class LifecycleBehaviorViewController: UIViewController { | |
private unowned let behaviorsHost: UIViewController | |
private let behaviors: [ViewControllerLifecycleBehavior] | |
// MARK: - Initialization | |
init(behaviors: [ViewControllerLifecycleBehavior], behaviorsHost: UIViewController) { | |
self.behaviorsHost = behaviorsHost | |
self.behaviors = behaviors | |
super.init(nibName: nil, bundle: nil) | |
} | |
required init?(coder aDecoder: NSCoder) { | |
fatalError("init(coder:) has not been implemented") | |
} | |
// MARK: - UIViewController | |
override func viewDidLoad() { | |
super.viewDidLoad() | |
view.isHidden = true | |
for behavior in self.behaviors { | |
behavior.afterLoading(self.behaviorsHost) | |
} | |
} | |
override func viewWillAppear(_ animated: Bool) { | |
super.viewWillAppear(animated) | |
for behavior in self.behaviors { | |
behavior.beforeAppearing(self.behaviorsHost) | |
} | |
} | |
override func viewDidAppear(_ animated: Bool) { | |
super.viewDidAppear(animated) | |
for behavior in self.behaviors { | |
behavior.afterAppearing(self.behaviorsHost) | |
} | |
} | |
override func viewWillDisappear(_ animated: Bool) { | |
super.viewWillDisappear(animated) | |
for behavior in self.behaviors { | |
behavior.beforeDisappearing(self.behaviorsHost) | |
} | |
} | |
override func viewDidDisappear(_ animated: Bool) { | |
super.viewDidDisappear(animated) | |
for behavior in self.behaviors { | |
behavior.afterDisappearing(self.behaviorsHost) | |
} | |
} | |
override func viewWillLayoutSubviews() { | |
super.viewWillLayoutSubviews() | |
for behavior in self.behaviors { | |
behavior.beforeLayingOutSubviews(self.behaviorsHost) | |
} | |
} | |
override func viewDidLayoutSubviews() { | |
super.viewDidLayoutSubviews() | |
for behavior in self.behaviors { | |
behavior.afterLayingOutSubviews(self.behaviorsHost) | |
} | |
} | |
} |
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