ResponderChain is a library that passes events using the responder chain.

In Cocoa's development model, events can be delivered using delegate, block, and notification. Usually a delegate or block is used to pass events between a ViewController and a View, However, when a deep nested view needs to pass events to the ViewController, using a delegate or block might require passing them layer by layer. Now, events can be passed in one step, regardless of how deep the view hierarchy is, using the ResponderChain.

Swift Package Manager is Apple's decentralized dependency manager to integrate libraries to your Swift projects. It is now fully integrated with Xcode 11

To integrate ResponderChain into your project using SPM, specify it in your Package.swift file:

let package = Package(
    …
    dependencies: [
        .package(url: "https://github.com/GodL/ResponderChain.git", from: "2.0.0"),
    ],
    targets: [
        .target(name: "YourTarget", dependencies: ["ResponderChain", …])
        …
    ]
)

pod 'GLResponderChain', '~> 2.0.0'

let rootView = UIView()

let subView = UIView()

let subSubView = UIView()

rootView.addSubview(subView)
subView.addSubview(subSubView)

rootView.rsp.register(key: “123”) { (value: String) -> Bool in
    XCTAssertEqual(value, "123")
    return false
}

subView.rsp.register(key: ”123) { (value: String) -> Bool in
    XCTAssertEqual(value, "123")
    return true
}

subSubView.rsp.handler(key: “123”, value: "123")

var key123: ResponderKey<String> = ResponderKey(value: "123")

rootView.rsp.register(typeKey: key123) { (value: String) -> Bool in
    XCTAssertEqual(value, "123")
    return false
}

subView.rsp.register(typeKey: key123) { (value: String) -> Bool in
    XCTAssertEqual(value, "123")
    return true
}

subSubView.rsp.handler(typeKey: key123, value: "123")

Starting from ResponderChain 2.0.0, event delivery supports any object that complies with the NextType protocol (UIResresponder complies by default with the NextType protocol)

class NextTest: NextType {
    var next: UIView?
}

extension NextTest : ResponderWrappable {}

let nextTest = NextTest()
nextTest.next = rootView
nextTest.rsp.handler(typeKey: key123, value: "nextTest call")

GodL, [email protected]. Github GodL

I am happy to answer any questions you may have. Just create a new issue.

MIT License

Copyright (c) 2021 GodL

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.