87 lines
3.0 KiB
Swift
87 lines
3.0 KiB
Swift
//
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// UIViewController+Children.swift
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// Gemini-iOS
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//
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// Created by Shadowfacts on 12/17/20.
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//
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import UIKit
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// Based on MVCTodo by Dave DeLong: https://github.com/davedelong/MVCTodo/blob/841649dd6aa31bacda3ad7ef9a9a836f66281e50/MVCTodo/Extensions/UIViewController.swift
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extension UIViewController {
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func embedChild(_ newChild: UIViewController, in container: UIView? = nil) {
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// if the view controller is already a child of something else, remove it
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if let oldParent = newChild.parent, oldParent != self {
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newChild.beginAppearanceTransition(false, animated: false)
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newChild.willMove(toParent: nil)
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newChild.removeFromParent()
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if newChild.viewIfLoaded?.superview != nil {
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newChild.viewIfLoaded?.removeFromSuperview()
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}
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newChild.endAppearanceTransition()
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}
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// since .view returns an IUO, by default the type of this is "UIView?"
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// explicitly type the variable because We Know Better™
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var targetContainer: UIView = container ?? self.view
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if !targetContainer.isContainedWithin(view) {
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targetContainer = view
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}
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// add the view controller as a child
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if newChild.parent != self {
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newChild.beginAppearanceTransition(true, animated: false)
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addChild(newChild)
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newChild.didMove(toParent: self)
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targetContainer.embedSubview(newChild.view)
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newChild.endAppearanceTransition()
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} else {
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// the view controller is already a child
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// make sure it's in the right view
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// we don't do the appearance transition stuff here,
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// because the vc is already a child, so *presumably*
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// that transition stuff has already appened
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targetContainer.embedSubview(newChild.view)
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}
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}
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func removeViewAndController() {
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view.removeFromSuperview()
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removeFromParent()
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}
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}
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// Based on MVCTodo by Dave DeLong: https://github.com/davedelong/MVCTodo/blob/841649dd6aa31bacda3ad7ef9a9a836f66281e50/MVCTodo/Extensions/UIView.swift
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extension UIView {
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func embedSubview(_ subview: UIView) {
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if subview.superview == self { return }
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if subview.superview != nil {
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subview.removeFromSuperview()
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}
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subview.frame = bounds
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addSubview(subview)
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NSLayoutConstraint.activate([
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subview.leadingAnchor.constraint(equalTo: leadingAnchor),
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subview.trailingAnchor.constraint(equalTo: trailingAnchor),
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subview.topAnchor.constraint(equalTo: topAnchor),
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subview.bottomAnchor.constraint(equalTo: bottomAnchor)
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])
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}
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func isContainedWithin(_ other: UIView) -> Bool {
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var current: UIView? = self
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while let proposedView = current {
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if proposedView == other { return true }
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current = proposedView.superview
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}
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return false
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}
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}
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