Swift将UIRotationGestureRecognizer反转为子视图

Question

我想从UIRotationGestureRecognizer中反转特定子视图的旋转。我的旋转发生在90度阶段（所以CGFloat.pi / 2）

func localhandleRotateGesture (localrotateGesture: UIRotationGestureRecognizer) {
    if localrotateGesture.state == .ended {
        if localrotateGesture.rotation > 0.0005{
            localrotateGesture.view?.transform = (localrotateGesture.view?.transform)!.rotated(by: CGFloat.pi / 2)
}
    localrotateGesture.rotation = 0

}

工作正常。然后我访问子视图并尝试反转运动

    var thisCell = localrotateGesture.view as! CustomMessageCell
    thisCell.cellButtonsStackView.transform = (localrotateGesture.view?.transform.inverted())!.rotated(by: CGFloat.pi / 2)

子视图会旋转第一次尝试，之后就不会了！发生了什么事？