ASSwiftDelegates --}{:

This repository is a community opened solution to this question : How well implement delegates design pattern in Swift ?

Updated for Swift 4.1 and test on Xcode 9.4.1

##Motivations

The delegate design pattern is in the heart of UIKit and widely use in iOs.

For more information on this design pattern, see : Apple documentation or Wikipedia

Writing a Simple delegation with only one delegate is really easy and quick in Swift :

protocol LoginManagerDelegate : AnyObject {
    func logStatusDidChanged ()
}

class LoginManager {
    weak var delegate:LoginManagerDelegate?
    
    func login () {
        //...
        delegate?.logStatusDidChanged()
        //...
    }
}

When times come to make an object which manage multiple delegates, things become harder and this is the aim of this piece of code : make it simplest as possible.

NSNotificationCenter is a great tool but cannot be use when you want to get something from your delegates.

##Requirements

• Add more than one delegate
• Delegate must conform a given Protocol
• Don’t store strong Delegate’s references
• Limit code duplications
• Not using NSNotificationCenter

##Proposed solution

As in Swift 3 everything can be cast in AnyObject, things become easier.

Your class only have to conform to the protocol ManagerWithDelegates and automatically get the following methods :

func addDelegate (delegate:DelegateType)
func removeDelegate (delegate:DelegateType)
func fire (action:(DelegateType)->Void) 

The code you need to write is as little as possible :

class LoginManagerDelegate {
    var logStatusDidChanged:(() -> Void)?
}


class LoginManager : ManagerWithDelegates {
	//You must own a DelegateCollection
    var delegateCollection = DelegateCollection<LoginManagerDelegate> ()

    func login () {
        //...
        delegateCollection.fire() {
            delegate in
            delegate.logStatusDidChanged?()
        }
        //...
    }
}

##What need to be improved Access to delegateCollection might be limited to prevent other classes than your manager to fire its delegates.

##Communnity Please feel free to make pull request and/or give feedback about the proposed solution.

##License ASSwiftDelegates is released under the MIT license. See LICENSE for details.