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class UIViewSpringAnimator: SwipeAnimator {

    // 动画完成的闭包

    var completion:((Bool) ->Void)?

    func addCompletion(completion:@escaping (Bool) ->Void) {

        self.completion = { [weakself] finished in

            guardself?.isRunning ==true else {

            self?.isRunning =false

            self?.animations =nil

            self?.completion =nil

            completion(finished)

        }

    }

}