Timer_iOS9

@objcMembers
private class BlockHandler: NSObject {
    
    var block: (() -> Void)?
    
    @objc func runBlock() {
        block?()
    }
}

private extension Timer {
    
    class func iOS9Ready_scheduledTimer(withTimeInterval interval: TimeInterval, repeats: Bool, block: @escaping (Timer) -> Swift.Void) -> Timer {
        if #available(iOS 10.0, *) {
            return scheduledTimer(withTimeInterval: interval, repeats: repeats, block: block)
        } else {
            let blockHandler = BlockHandler()
            let timer = Timer.scheduledTimer(timeInterval: interval, target: blockHandler, selector: #selector(BlockHandler.runBlock), userInfo: nil, repeats: repeats)
            blockHandler.block = { [weak timer] in
                guard let timer = timer else { return }
                block(timer)
            }
            return timer
        }
    }
}