Combine 실습 5

import Combine

// URLSessionTask Publisher and JSON Decoding Operator

struct SomeDecodable: Decodable { }

URLSession.shared.dataTaskPublisher(for: URL(string: "https://www.google.com")!)
	.map { data, response in
    return data
   	}
	.decode(type: SomeDecodable.self, decoder: JSONDecoder())


// Notifications

let center = NotificationCenter.default
let noti = Notification.Name("MyNoti")
let notiPublisher = center.publisher(for: noti, object: nil)
let subscription1 = notiPublisher.sink { _ in
	print("Noti Received")
}

center.post(name: noti, object: nil)
subscription1.cancel()

// KeyPath binding to NSObject instances

let ageLabel = UILabel()
print("text: \(ageLabel.text)")

Just(28)
	.map { "Age is \($0)"}
    .assign(to: \.text, on: ageLabel)
print("text: \(ageLabel.text)")



// Timer
// autoconnect 를 이용하면 subscribe 되면 바로 시작함
let timerPublisher = Timer
	.publish(every: 1, on: .main, in: .common)
    .autoconnect()

let subscription2 = timerPublisher.sink { time in
	print("time: \(time)")
}

DispatchQueue.main.asyncAfter(deadline: .now() + 5) {
	subscription2.cancel()
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