Swift和Xcode9中的VisualEffectView

Question

Picture of my code

import UIKit

class ViewController: UIViewController {

   @IBOutlet var addItemView: UIView!

   @IBOutlet weak var visualEffectView: UIVisualEffectView!

   var effect: UIVisualEffect!

    override func viewDidLoad() {
        super.viewDidLoad()

        effect = visualEffectView.effect
        visualEffectView.effect = nil

        addItemView.layer.cornerRadius = 5
   }

    func animateIn(){
        self.view.addSubview(addItemView)
        addItemView.center = self.view.center

        addItemView.transform = CGAffineTransform.init(scaleX: 1.3, y: 1.3)
        addItemView.alpha = 0

        UIView.animate(withDuration: 0.4){
            self.visualEffectView.effect = self.effect
            self.addItemView.alpha = 1
            self.addItemView.transform = CGAffineTransform.identity
        }
    }

    @IBAction func sourcesButton(_ sender: Any) {
        animateIn()
    }


    @IBAction func sourceDone(_ sender: Any) {
    }

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


}

我试图创建一个当用户单击按钮时弹出的模糊模式，但由于某种原因，此代码无法执行。我正在关注youtube (Youtube Link)上的一个教程，我将非常感谢你的帮助。

Answer 1

改为像这样创建模糊视图：

var blurEffect = UIBlurEffect(style: UIBlurEffectStyle.Dark)
var blurEffectView = UIVisualEffectView(effect: blurEffect)
view.addSubview(blurEffectView)

在创建之后，您可以将alpha设置为0，并将其动画设置为1。

请注意，带有UIBlurEffect的动画在设备上看起来很可怕:p