element-ios/Riot/Utils/WeakObjectWrapper.swift

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2021-06-22 06:59:14 +00:00
//
// Copyright 2021 New Vector Ltd
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
import Foundation
/**
Used to avoid retain cycles by creating a proxy that holds a weak reference to the original object.
One example of that would be using CADisplayLink, which strongly retains its target, when manually invalidating it is unfeasable.
*/
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class WeakObjectWrapper: NSObject {
private weak var wrappedObject: AnyObject?
init(_ object: AnyObject) {
wrappedObject = object
}
override func responds(to aSelector: Selector!) -> Bool {
return (wrappedObject?.responds(to: aSelector) ?? false) || super.responds(to: aSelector)
}
override func forwardingTarget(for aSelector: Selector!) -> Any? {
return wrappedObject
}
}