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Extension of UIViewController with helpers methods to simplify embedding child view controllers. <Swift 3.0.2>
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/* | |
MIT License | |
Copyright © 2017 Dmytro Kholodov | |
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 USE OR OTHER DEALINGS IN THE | |
SOFTWARE. | |
*/ | |
import UIKit | |
/// Predefined Layouts for an embedded controller | |
enum BindLayoutOptions { | |
/// Hidden. View of embedded controller is invisible. It can propagate | |
/// other view into the partent controller. | |
case zero | |
/// Fill size of the parent controller. | |
case fill | |
/// Custom callback. Custom layout and custom setup. | |
typealias Callback = (_ childView: UIView) -> Void | |
case custom(Callback) | |
} | |
/// | |
/// UIViewController helpers to add and remove child view controllers. | |
/// | |
extension UIViewController { | |
/// Add child view controller with specified layout presets. | |
/// - Parameters: | |
/// - child: controller to be added as a child controller | |
/// - layout: predefined layout | |
func addController(embedded: UIViewController, layout: BindLayoutOptions = .fill) { | |
addChildViewController(embedded) | |
embedded.willMove(toParentViewController: self) | |
setupView(child: embedded.view, layout: layout) | |
embedded.didMove(toParentViewController: self) | |
} | |
/// Remove child view controller from the parent controller. | |
/// - Parameters: | |
/// - child: a controller to be added as a child controller | |
func removeController(embedded: UIViewController) { | |
embedded.willMove(toParentViewController: nil) | |
embedded.view.removeFromSuperview() | |
embedded.removeFromParentViewController() | |
} | |
/// Layout the child view in the superview | |
/// - Parameters: | |
/// - child: view to be added as a child controller | |
/// - layout: predefined layout | |
private func setupView(child: UIView, layout: BindLayoutOptions) { | |
view.addSubview(child) | |
switch layout { | |
case .zero: | |
child.frame = CGRect.zero | |
break | |
case .fill: | |
break | |
case .custom(let callback): | |
callback(child) | |
break | |
} | |
} | |
} | |
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Examples
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