Created
April 11, 2016 07:51
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class Throttle<T>: NSObject { | |
let timeout: Double | |
let callback: T -> Void | |
var timer: NSTimer? = nil | |
var buffer: T? = nil | |
init(timeout: Double, callback: T -> Void) { | |
self.timeout = timeout | |
self.callback = callback | |
} | |
deinit { | |
timer?.invalidate() | |
} | |
func input(value: T) { | |
cancel() | |
buffer = value | |
resetTimer() | |
} | |
func cancel() { | |
if let timer = self.timer where timer.valid { | |
timer.invalidate() | |
} | |
timer = nil | |
buffer = nil | |
} | |
private func resetTimer() { | |
timer = NSTimer(timeInterval: timeout, target: self, selector: #selector(fetchTimerDidFire(_:)), userInfo: nil, repeats: false) | |
} | |
func fetchTimerDidFire(sender: AnyObject) { | |
guard let value = buffer else { | |
return | |
} | |
callback(value) | |
} | |
} |
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