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AsyncOperation
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| import Foundation | |
| class AsyncOperation: Operation { | |
| enum State: String { | |
| case ready, executing, finished | |
| fileprivate var keyPath: String { | |
| return "is\(rawValue.capitalized)" | |
| } | |
| } | |
| var state = State.ready { | |
| willSet { | |
| willChangeValue(forKey: newValue.keyPath) | |
| willChangeValue(forKey: state.keyPath) | |
| } | |
| didSet { | |
| didChangeValue(forKey: oldValue.keyPath) | |
| didChangeValue(forKey: state.keyPath) | |
| } | |
| } | |
| override var isReady: Bool { | |
| return super.isReady && state == .ready | |
| } | |
| override var isExecuting: Bool { | |
| return state == .executing | |
| } | |
| override var isFinished: Bool { | |
| return state == .finished | |
| } | |
| override var isAsynchronous: Bool { | |
| return true | |
| } | |
| override func start() { | |
| if isCancelled { | |
| state = .finished | |
| return | |
| } | |
| main() | |
| state = .executing | |
| } | |
| } |
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