SWRevealViewController：后视图（菜单）打开时更改前视图的颜色

Question

我正在使用带有 SWRevealViewController 的 Swift 3 来创建侧边栏菜单应用程序。

后视图（菜单）打开时如何控制前视图的颜色？ 我想显示灰色（如禁用/透明）。 到目前为止，我尝试的任何方法都没有奏效，也无法在线找到直接的解决方案。 我可以控制后视颜色，但不能控制前视。

到目前为止，我已经尝试在后视图控制器的 viewWillAppear 中更改前视图颜色。

在 MenuController 中的 viewWillAppear 看起来像：

覆盖 func viewWillAppear(_ animated: Bool) {

print("MenuController - viewWillAppear")
super.viewWillAppear(animated)
self.revealViewController().frontViewController.view.isUserInteractionEnabled = false
self.revealViewController().view.addGestureRecognizer(self.revealViewController().panGestureRecognizer())
self.revealViewController().frontViewController.view.backgroundColor = UIColor.blue
self.revealViewController().rearViewController.view.backgroundColor = UIColor.gray
}

它会改变后视图的颜色，但不适用于前视图。 而且我希望灰色的禁用外观不仅仅是更改背景颜色。

Answer 1

尝试将其添加到您的后视图控制器类中的 viewWillAppear 方法中

revealViewController.frontViewController.view.backgroundColor = UIColor.blue //Set colour to what ever you want

所以它应该是这样的

override func viewWillAppear(_ animated: Bool) {
    super.viewWillAppear(animated)
    revealViewController.frontViewController.view.backgroundColor = UIColor.blue
}

编辑：

好的，我已经尝试过这样做，它似乎有效

如果您创建一个新的 UIView 并将其添加到 frontViewController 中，然后在视图消失时将其删除。

var view: UIView?

override func viewWillAppear(_ animated: Bool) {
    super.viewWillAppear(animated)
    //Create the view the same size as your frontViewController
    view = UIView(frame: CGRect(x: CGFloat(0), y: CGFloat(0), width: CGFloat(revealViewController.view.frame.size.width), height: CGFloat(revealViewController.view.frame.size.height)))
    //Set the colour of the view to whatever you like
    view?.backgroundColor = UIColor.blue
    //Add the new view to the frontViewcontroller
    revealViewController.frontViewController.view.addSubview(view!)
}

override func viewWillDisappear(_ animated: Bool) {
    super.viewWillDisappear(animated)
    //Remove the view from the frontViewController
    view?.removeFromSuperview()
}

编辑：

如果您向 UIView 添加点击手势，则在点击功能中删除视图而不是 viewWillDisappear

var view: UIView?

override func viewWillAppear(_ animated: Bool) {
    super.viewWillAppear(animated)
    //Create the view the same size as your frontViewController
    view = UIView(frame: CGRect(x: CGFloat(0), y: CGFloat(0), width: CGFloat(revealViewController.view.frame.size.width), height: CGFloat(revealViewController.view.frame.size.height)))
    //Set the colour of the view to whatever you like
    view?.backgroundColor = UIColor.blue
    //Add a tap gesture to the UIview
    let tap = UITapGestureRecognizer(target: self, action: #selector(self.handleTap(_:)))
    view?.addGestureRecognizer(tap)
    //Add the new view to the frontViewcontroller
    revealViewController.frontViewController.view.addSubview(view!)
}

func handleTap(_ sender: UITapGestureRecognizer) {
    //Remove the view from the frontViewController
    view?.removeFromSuperview()
}

override func viewWillDisappear(_ animated: Bool) {
    super.viewWillDisappear(animated)
    //Moved the remove to the tap gesture function
}