setImage迅捷的位置

Question

我是Xcode和Swift编程的新手，似乎我不懂语言。我正在尝试创建一个按钮，在单击时更改图像并弹出菜单的动画。只要我不更改图像，一切正常。一旦我添加了按钮图像的切换，动画就不会做它应该做的事情。

我的印象是当我使用'setImage'时会改变一些参数。

@IBAction func buttonMoreClicked(_ sender: UIButton) {

   toggleButton(button: sender, imageOn: UIImage(named: "iconClose.png")!, imageOff: UIImage(named: "iconAdd.png")!)

    if (boolFirstClickButtonMore == false) {
        boolFirstClickButtonMore = true
        self.centerAddEventButton = self.buttonAddEvent.center
        self.centerAddGroceryButton = self.buttonAddGrocery.center
        self.centerAddTasksButton = self.buttonAddTasks.center           

        self.righttopAddEventLabel = self.labelAddEvent.frame.origin
        self.righttopAddGroceryLabel = self.labelAddGrocery.frame.origin
        self.righttopAddTasksLabel = self.labelAddTasks.frame.origin

        self.buttonAddEvent.center = self.buttonMore.center
        self.buttonAddGrocery.center = sender.center
        self.buttonAddTasks.center = sender.center

        self.labelAddEvent.frame.origin = self.buttonMore.frame.origin
        self.labelAddGrocery.frame.origin = self.buttonMore.frame.origin
        self.labelAddTasks.frame.origin = self.buttonMore.frame.origin
    }

    // If button 'MORE' is set then hide menu buttons
    if (boolSetMore) {
        boolSetMore = false
        sender.layer.backgroundColor = self.colorGreen.cgColor
        UIView.animate(withDuration: 0.3, animations: {
            self.buttonAddEvent.center = self.buttonMore.center
            self.buttonAddGrocery.center = sender.center
            self.buttonAddTasks.center = sender.center

            self.labelAddEvent.frame.origin = self.buttonMore.frame.origin
            self.labelAddGrocery.frame.origin = sender.frame.origin
            self.labelAddTasks.frame.origin = sender.frame.origin

            self.viewDisable.alpha = 0.0
            self.buttonAddEvent.alpha = 0.0
            self.buttonAddGrocery.alpha = 0.0
            self.buttonAddTasks.alpha = 0.0

            self.labelAddEvent.alpha = 0.0
            self.labelAddGrocery.alpha = 0.0
            self.labelAddTasks.alpha = 0.0

        })
    }
    else {
        boolSetMore = true
        self.viewDisable.alpha = 0.75

        self.buttonMore.layer.backgroundColor = self.colorDarkGreen.cgColor
        UIView.animate(withDuration: 0.3, animations: {
            self.buttonAddEvent.center = self.centerAddEventButton
            self.buttonAddGrocery.center = self.centerAddGroceryButton
            self.buttonAddTasks.center = self.centerAddTasksButton

            self.labelAddEvent.frame.origin = self.righttopAddEventLabel
            self.labelAddGrocery.frame.origin = self.righttopAddGroceryLabel
            self.labelAddTasks.frame.origin = self.righttopAddTasksLabel

            self.buttonAddEvent.alpha = 1.0
            self.buttonAddGrocery.alpha = 1.0
            self.buttonAddTasks.alpha = 1.0

            self.labelAddEvent.alpha = 1.0
            self.labelAddGrocery.alpha = 1.0
            self.labelAddTasks.alpha = 1.0
        })
    }

}
func toggleButton(button: UIButton, imageOn: UIImage, imageOff: UIImage) {
   if (button.currentImage == imageOn) {
        button.setImage(imageOff, for: .normal )
    }
    else {
        button.setImage(imageOn, for: .normal )
    }
}

单击buttonMore时，buttonMore会显示三个按钮和标签。再次单击时，三个按钮和标签应移回buttonMore，alpha设置为0（动画）。这工作正常，但是当我添加图像的切换时，三个按钮的位置会发生变化，动画也会消失。有人有想法吗？