43 lines
1.8 KiB
Swift
43 lines
1.8 KiB
Swift
//
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// Copyright 2022 New Vector Ltd
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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import Foundation
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import UIKit
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/// The presentation context is used by `UserIndicatorViewPresentable`s to display content
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/// on the screen and it serves two primary purposes:
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///
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/// - abstraction on top of UIKit (passing context instead of view controllers)
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/// - immutable context passed at init with variable presenting view controller
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/// (e.g. depending on collapsed / uncollapsed iPad presentation that changes
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/// at runtime)
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public protocol UserIndicatorPresentationContext {
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var indicatorPresentingViewController: UIViewController? { get }
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}
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/// A simple implementation of `UserIndicatorPresentationContext` that uses a weak reference
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/// to the passed-in view controller as the presentation context.
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public class StaticUserIndicatorPresentationContext: UserIndicatorPresentationContext {
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// The presenting view controller will be the parent of the user indicator,
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// and the indicator holds a strong reference to the context, so the view controller
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// must be decleared `weak` to avoid a retain cycle
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public private(set) weak var indicatorPresentingViewController: UIViewController?
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public init(viewController: UIViewController) {
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self.indicatorPresentingViewController = viewController
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}
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}
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