SwiftMulticastDelegate

Implementing multi cast of delegate in Swift.

Installation

1. Manual:

Copy SwiftMulticastDelegate.swift to your project

2. CocoaPods:

pod 'SwiftMulticastDelegate', :git => 'https://github.com/chenmingbiao/SwiftMulticastDelegate.git'

3. Swift Package Manager:

You can use Swift Package Manager and specify a dependency in Package.swift by adding this:

.Package(url: "https://github.com/chenmingbiao/SwiftMulticastDelegate.git", majorVersion: 1)

Usage

Import the module

import SwiftMulticastDelegate

1. Add to your class: let delegate = SwiftMulticastDelegate<MyProtocol>()
2. Other classes must add as a delegate: obj.delegate.add(self)
3. When you need to notify your delegates: multicastDelegate.invoke { delegate in delegate.func() }

Alternative version:

1. Add to your class: let delegate = SwiftMulticastDelegate<MyProtocol>()
2. Other classes must add as a delegate: obj.delegate += self
3. When you need to notify your delegates: multicastDelegate => { $0.func() }

Example

// MARK: - MyButtonDelegate
protocol MyButtonDelegate: class {
    func didTap()
}

// MARK: - MyButton
class MyButton: UIButton {

    var delegate = SwiftMulticastDelegate<MyButtonDelegate>()

    override init(frame: CGRect) {
        super.init(frame: frame)
        self.setTitle("Action", for: .normal)
        self.setTitleColor(UIColor.blue, for: .normal)
        self.addTarget(self, action: #selector(didTap), for: .touchUpInside)
    }

    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }

    @objc func didTap() {
        delegate => {
            $0.didTap()
        }
    }

}

// MARK: - SubView
class SubView: UIView {
    var name = ""
}

extension SubView: MyButtonDelegate {
    func didTap() {
        print("\(name) did tap")
    }
}

// MARK: - ViewController
class ViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()

        let button = MyButton(frame: CGRect(x: 0, y: 0, width: 100, height: 40))
        button.center = self.view.center
        self.view.addSubview(button)

        let subview1 = SubView()
        subview1.name = "subview@1"
        button.delegate += subview1
        self.view.addSubview(subview1)

        let subview2 = SubView()
        subview2.name = "subview@2"
        button.delegate += subview2
        self.view.addSubview(subview2)

        /* Add Array */
        // button.delegate += [subview1, subview2]

        /* Rmove Array */
        // button.delegate -= [subview1, subview2]
    }

}

Operators

Simplify multicast usage

+= calls add(_ delegate: T) or add(_ delegate: [T])

-= calls remove(_ delegate: T) or remove(_ delegate: [T])

=> calls invoke(_ invocation: (T) -> ())

License

SwiftMulticastDelegate is available under the MIT license.