SWRevealViewController 菜单打开时模糊 FontView

Posted 2023-02-23

【中文标题】SWRevealViewController 菜单打开时模糊 FontView

【英文标题】：Blur the FontView when SWRevealViewController menu opens

【发布时间】：2016-08-07 14:28:51

【问题描述】：

我在使用SWRevealViewController 创建的应用程序中使用幻灯片菜单。现在我想在用户打开菜单时模糊FrontView。这怎么可能？我的想法是在FrontViewController 中有一个alpha 值为0 的blurView。当用户打开菜单时，alpha 值变为 1。我的问题是当用户打开菜单时是否有一个特定的函数被调用？

如果可能，blurView's alpha 值应该与打开菜单的滑动一样变化：当用户使用GestureRecognizer 打开菜单时，menuViewController 的移动和 的变化alpha 值应该相等。

我希望你能理解我的问题。 感谢您的帮助！

【参考方案1】：

我一直在研究你的问题，这是我的结果，

首先，在 SWRevealViewControllerDelegate 中，您有 3 种方法可以注意到revealViewController panGestureRecognizer 上的变化

func revealController(revealController: SWRevealViewController!, panGestureBeganFromLocation location: CGFloat, progress: CGFloat) 


func revealController(revealController: SWRevealViewController!, panGestureMovedToLocation location: CGFloat, progress: CGFloat, overProgress: CGFloat) 


func revealController(revealController: SWRevealViewController!, panGestureEndedToLocation location: CGFloat, progress: CGFloat, overProgress: CGFloat) 

所以你需要让你的FrontViewController 成为SWRevealViewController 的代表

喜欢这个self.revealViewController().delegate = self

然后使用基于教程提供的示例代码的https://www.raywenderlich.com/84043/ios-8-visual-effects-tutorial 的扩展名为UIImage+ImageEffects，我们可以从frontViewController.view 创建一个图像并应用上述类别中的高斯模糊这是代码

import UIKit

class MainViewController: UIViewController,SWRevealViewControllerDelegate 

    var imageBlur : UIImageView?
    var originalImage : UIImage?
    let maxRadius : CGFloat = 5.0
    let minRadius = 0
    var arrayOfImages : [UIImage]?

    override func viewDidLoad() 
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
        self.view.addGestureRecognizer(self.revealViewController().panGestureRecognizer())
        self.revealViewController().delegate = self

    

    override func didReceiveMemoryWarning() 
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    

    override func viewDidAppear(animated: Bool) 
        super.viewDidAppear(animated)
        self.originalImage = self.takeSnapShotOfView(self.view)
        self.imageBlur = UIImageView(image: self.originalImage)
        self.view.addSubview(self.imageBlur!)
    

    func revealController(revealController: SWRevealViewController!, panGestureBeganFromLocation location: CGFloat, progress: CGFloat) 

        let image = self.originalImage
        self.imageBlur?.image = image?.applyFixedBlurWithRadius(CGFloat(progress*self.maxRadius))
    

    func revealController(revealController: SWRevealViewController!, panGestureMovedToLocation location: CGFloat, progress: CGFloat, overProgress: CGFloat) 
        let image = self.originalImage
        self.imageBlur?.image = image?.applyFixedBlurWithRadius(CGFloat(progress*self.maxRadius))

    

    func revealController(revealController: SWRevealViewController!, panGestureEndedToLocation location: CGFloat, progress: CGFloat, overProgress: CGFloat) 
        let image = self.originalImage
        self.imageBlur?.image = image?.applyFixedBlurWithRadius(CGFloat(progress*self.maxRadius))

    

    func revealController(revealController: SWRevealViewController!, willMoveToPosition position: FrontViewPosition) 
        if(position == .Left)
        
            self.imageBlur?.image = self.originalImage
        
        if(position == .Right)
        
            let image = self.originalImage
            self.imageBlur?.image = image?.applyFixedBlurWithRadius(CGFloat(1*self.maxRadius))
        
    

    func takeSnapShotOfView(view:UIView) ->UIImage
    
        UIGraphicsBeginImageContext(CGSizeMake(view.frame.size.width, view.frame.size.height))
        view.drawViewHierarchyInRect(CGRectMake(0, 0, view.frame.size.width, view.frame.size.height), afterScreenUpdates: true)
        let image = UIGraphicsGetImageFromCurrentImageContext()
        UIGraphicsEndImageContext()

        return image
    

希望对你有帮助

【讨论】：

太棒了！非常感谢