Swift 防止关键帧动画完成后视图捕捉回来

我有一个视图，我正在以这样的方式设置动画，它将展开并移动到视图控制器中的一组新坐标。我使用关键帧执行此操作：

UIView.animateKeyframesWithDuration(0.5, delay: 0, options: .CalculationModeCubic, animations: {
    UIView.addKeyframeWithRelativeStartTime(0.0, relativeDuration: 0.5) {

        //Moving main View
        tappedView.frame = CGRectMake((self.screenSize.width/2)-250, (self.screenSize.height/2)-250, 500, 500)

    }
}, completion: nil)

问题在于，一旦动画完成，视图将返回到其原始位置和大小

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有没有办法防止Swift中出现这种情况？

如果使用自动布局，这是一个问题。在这种情况下，必须将最终坐标放入完成处理程序中，以使其工作

Swift 2

UIView.animateKeyframesWithDuration(0.5, delay: 0, options: .CalculationModeCubic, animations: {
    UIView.addKeyframeWithRelativeStartTime(0.0, relativeDuration: 0.5) {
        // Moving main View
        tappedView.frame = CGRectMake((self.screenSize.width/2)-250, (self.screenSize.height/2)-250, 500, 500)
    }
}, completion: {(finished: Bool) -> Void in
    tappedView.frame = CGRectMake((self.screenSize.width/2)-250, (self.screenSize.height/2)-250, 500, 500)
})

Swift 3、4、5

UIView.animateKeyframes(withDuration: 0.5, delay: 0, options: .calculationModeCubic, animations: {
    UIView.addKeyframe(withRelativeStartTime: 0.0, relativeDuration: 0.5) {
        // Moving main View
        tappedView.frame = CGRect(x: (self.screenSize.width/2)-250, y: (self.screenSize.height/2)-250, width: 500, height: 500)
    }
}, completion: {(finished: Bool) -> Void in
    tappedView.frame = CGRect(x: (self.screenSize.width/2)-250, y: (self.screenSize.height/2)-250, width: 500, height: 500)
})