objective-c - 无法获得模糊效果

我在storyBorad中使用UIVisual Effect视图。我只是为该视图设置了四个约束（上，下，左，右）。但后面看起来有些黑色。

源代码：

import UIKit

class SignOutViewController: UIViewController {

    @IBOutlet weak var signouTitle: UILabel!
    @IBOutlet weak var desc1: UILabel!
    @IBOutlet weak var desc2: UILabel!
    @IBOutlet weak var cancelButton: UIButton!
    @IBOutlet weak var sureButton: UIButton!
    @IBOutlet weak var alertView: UIView!
    @IBOutlet weak var seperatorView: UIView!
    @IBOutlet weak var buttonsSuperView: UIView!

    override func viewDidLoad() {
        super.viewDidLoad()
        prepareAlertView()
    }

    override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)
        alertView.layer.cornerRadius = alertView.frame.height * 0.05

    }

    private func prepareAlertView() -> Void{
        signouTitle.text = "Sign Out"
        desc1.text = "Do you really want to sign out"
        desc2.text = "from this account"
        signouTitle.textColor = UIColor(red: 1 / 255, green: 170 / 255, blue: 112 / 255, alpha: 1)
        desc1.textColor = UIColor(red: 195 / 255, green: 195 / 255, blue: 195 / 255, alpha: 1)
        desc2.textColor = UIColor(red: 195 / 255, green: 195 / 255, blue: 195 / 255, alpha: 1)
        cancelButton.setAttributedTitle(NSAttributedString(string: "Cancel", attributes: [NSFontAttributeName: UIFont.getProximaNovaSemibold(size: 16), NSForegroundColorAttributeName: UIColor.white]), for: .normal)
        sureButton.setAttributedTitle(NSAttributedString(string: "Sure", attributes: [NSFontAttributeName: UIFont.getProximaNovaSemibold(size: 16), NSForegroundColorAttributeName: UIColor.white]), for: .normal)
        self.view.backgroundColor = UIColor.black.withAlphaComponent(0.65)
        buttonsSuperView.backgroundColor = UIColor(red: 1 / 255, green: 170 / 255, blue: 112 / 255, alpha: 1)
        alertView.backgroundColor = UIColor(red: 36 / 255, green: 36 / 255, blue: 40 / 255, alpha: 1)
    }

    @IBAction func cancelTapped(_ sender: Any) {
        self.dismiss(animated: true, completion: nil)
    }

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

}

我以编程方式添加了UIVisual effectView。我需要visualEffect作为viewHierarchy中的-1位置。但它的响应相同。

最佳答案

尝试这个

let blurEffect = UIBlurEffect(style: UIBlurEffectStyle.dark)
let blurEffectView = UIVisualEffectView(effect: blurEffect)
blurEffectView.frame = view.bounds
blurEffectView.autoresizingMask = [.flexibleWidth, .flexibleHeight]
view.addSubview(blurEffectView)

关于objective-c - 无法获得模糊效果，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/45937509/