swift - 为UIView添加模糊以便“模糊”下面的控制器？之前阅读

Question

我知道这个问题看似重复，但请在downvote之前阅读！

我有ReachabilityViewController，其中有一个名为pickerView的UIView，如下图所示

我想要的结果是：

但我得到了这个：

这是我的viewController类：

import UIKit

class ReachabilityViewController: UIViewController {

    //MARK: pickerView outlets and actions
    @IBOutlet weak var pickerView: UIView!
    @IBOutlet weak var saveButton: UIButton!
    @IBOutlet weak var cancelButton: UIButton!
    @IBOutlet weak var startEndLabel: UILabel!
    @IBOutlet weak var timePicker: UIDatePicker!

    override func viewDidLoad() {
        super.viewDidLoad()
        pickerView.frame = CGRect(x: 0.0, y: 0.0, width: UIScreen.main.bounds.width, height: UIScreen.main.bounds.height)

}


// MARK: - Table view data source
extension ReachabilityViewController: UITableViewDelegate, UITableViewDataSource {

    func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {

        self.view.addSubview(pickerView)
        pickerView.alpha = 0.0
        UIView.animate(withDuration: 0.3) {
            self.pickerView.alpha = 1.0
        }
    }
}

如何获得我想要的效果？ 我已将pickerView backgroundColor设置为清除。

Answer 1

这就是我所做的

class ViewController: UIViewController,UIPickerViewDataSource, UIPickerViewDelegate {

var pickerDataSource = ["White", "Red", "Green", "Blue"];
@IBOutlet var pickerView: UIPickerView!
override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.
    let blurEffect = UIBlurEffect(style: UIBlurEffectStyle.regular)
    let blurEffectView = UIVisualEffectView(effect: blurEffect)
    blurEffectView.frame = view.bounds
    blurEffectView.autoresizingMask = [.flexibleWidth, .flexibleHeight]
    self.pickerView.delegate = self
    self.pickerView.dataSource = self
    self.view.addSubview(blurEffectView)
    self.view.bringSubview(toFront: self.pickerView)

}

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

func numberOfComponents(in pickerView: UIPickerView) -> Int {
    return 1
}
func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
    return pickerDataSource.count;
}

func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String! {
    return pickerDataSource[row]
}

}