Swift object that provides an observable platform for multiple listeners.

• iOS 9.0+
• Xcode 9.x+
• Swift 4

Listenable is available through CocoaPods. To install it, simply add the following line to your Podfile:

 pod 'Listenable'

And run pod install.

Create a Listenable object either by inheriting or initializing a Listenable typed with a protocol:

 class ListenableObject: Listenable<ListenableDelegate> { // Class }

You can then add and remove listeners, and update them as required...

Add Listener(s):

add(listener: Listener, priority: ListenerPriority) -> Bool add(listeners: [Listener], priority: ListenerPriority) -> Void

Remove Listener(s):

remove(listener: Listener) -> Bool remove(listeners: [Listener]) -> Void removeAllListeners()

Enumerate & Update Listeners:

updateListeners(update: (listener: Listener, index: Int) -> Void)

ListenerPriority allows for definition of enumeration priority for a listener; by default the priority parameter is set to .low. The following values can be assigned:

.low (Raw: 0) .high (Raw: 1000) .custom(Valid range: 0-1000)

Listeners can also be updated exclusively relative to their priority:

updateListeners(withPriority: ListenerPriority?, update: (listener: Listener, index: Int) -> Void) updateListeners(withPriorities: ClosedRange<Int>?, update: (listener: Listener, index: Int) -> Void)

Bug reports and pull requests are welcome on GitHub at https://github.com/MerrickSapsford/Listenable.

The library is available as open source under the terms of the MIT License.