## ObserverSet
The ObserverSet is a lightweight Swift library that provides a simple implementation of the observer pattern. It allows you to easily manage a set of observers and notify them when certain events occur.
## Usage
To use ObserverSet in your project, follow these steps:
### Step 1: Installation
Open your project’s Podfile and add the following line:
“`ruby
pod ‘ObserverSet’
“`
Then, run the command `pod install` to install the library.
### Step 2: Import
In the file where you want to use the ObserverSet, import the library:
“`swift
import ObserverSet
“`
### Step 3: Creating an Observer Set
To create an ObserverSet, simply instantiate it with the desired observer type:
“`swift
let observerSet = ObserverSet
“`
Replace `YourObserverType` with the actual class or protocol that represents your observer.
### Step 4: Adding Observers
You can add observers to the set using the `add(_:)` method:
“`swift
observerSet.add(observer)
“`
Replace `observer` with the instance of your observer.
### Step 5: Removing Observers
To remove an observer from the set, use the `remove(_:)` method:
“`swift
observerSet.remove(observer)
“`
Replace `observer` with the instance of the observer you want to remove.
### Step 6: Notifying Observers
To notify all the observers in the set, call the `notify(_:)` method. This will invoke a closure or method on each observer:
“`swift
observerSet.notify { observer in
// Do something with the observer
}
“`
Replace the closure or method body as per your requirements.
## Example Usage
Here’s an example of how you can use the ObserverSet in your project:
“`swift
import ObserverSet
protocol EventObserver: AnyObject {
func eventOccurred()
}
class EventNotifier {
private let observerSet = ObserverSet
func add(observer: EventObserver) {
observerSet.add(observer)
}
func remove(observer: EventObserver) {
observerSet.remove(observer)
}
func notifyObservers() {
observerSet.notify { observer in
observer.eventOccurred()
}
}
}
class SomeViewController: UIViewController, EventObserver {
private let eventNotifier = EventNotifier()
override func viewDidLoad() {
super.viewDidLoad()
eventNotifier.add(observer: self)
}
func eventOccurred() {
// Handle the event
}
deinit {
eventNotifier.remove(observer: self)
}
}
“`
In the above example, we have a `SomeViewController` that conforms to the `EventObserver` protocol. It adds itself as an observer to the `EventNotifier` using the `add(observer:)` method. When the `eventOccurred()` method is called on the `EventNotifier`, it notifies all the observers, including the `SomeViewController`.
## Conclusion
The ObserverSet library simplifies the implementation of the observer pattern in Swift. By using it, you can easily manage a set of observers and notify them about events in your project. Take advantage of ObserverSet to make your code more modular and maintainable.