Delayer.swift

/**
* MIT License
*
* Copyright (c) 2017-present, Adrian Mayoral.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/

import Foundation

typealias Mapping<S> = (S) -> S

class Delayer {
    var timer: Timer?
    var exec: Mapping<Any>?
    
    init() {
        
    }
    
    func start(delay value: Double, executer: @escaping Mapping<Any>) {
        
        if timer != nil {
            self.timer?.invalidate()
        } 
        
        timer = Timer.scheduledTimer(
            timeInterval: TimeInterval(value),
            target: self,
            selector: #selector(executerHandler(timer:)),
            userInfo: nil,
            repeats: true
        )
        
        exec = executer
    }
    
    @objc func executerHandler(timer: Timer) {
        self.timer?.invalidate()
        self.timer = nil
        let _ = exec!([])
    }
    
    
}