分段控件，以編程方式更改UIImageView Swift 4/5

Question

我已將代碼包括到我的分段控件和UIImageView中。 任何幫助將是巨大的，謝謝。

let segmentedControl: UISegmentedControl = {
        let sc = UISegmentedControl(items: ["Login", "Register"])
        sc.translatesAutoresizingMaskIntoConstraints = false
        sc.tintColor = UIColor.white
        sc.selectedSegmentIndex = 0

        sc.addTarget(self, action: #selector(handleSegmentedControlChange), for: .valueChanged)
        return sc
    }()

// profile pic
    lazy var picture: UIImageView = {
        var pic = UIImageView()
        if segmentedControl.selectedSegmentIndex == 0 {
            pic.image = UIImage(named: "Logo")
        } else {
            pic.image = UIImage(named: "Profile")

            let mytapGestureRecognizer = UITapGestureRecognizer(target: self, action: #selector(handleSelectProfileImageView))
            mytapGestureRecognizer.numberOfTapsRequired = 1
            pic.addGestureRecognizer(mytapGestureRecognizer)
            pic.isUserInteractionEnabled = true
        }
        pic.translatesAutoresizingMaskIntoConstraints = false
        pic.contentMode = .scaleAspectFill
        return pic
    }()

圖片應該改變並啟用觸摸手勢，但是它們都不起作用。

Answer 1

將If-else塊移動到handleSegmentedControlChange選擇器。

Answer 2

1）創建一個@objc func ，將其作為參數接收(_ sender: UISegmentedControl) ，例如：

@objc func segmentedControlChanged(_ sender: UISegmentedControl)

2）創建UISegmentedControl后，使用addTarget，如下所示：

segmentedControl.addTarget(self, action: #selector(segmentedControlChanged(_:)), for: .valueChanged)

3）在您創建的功能中，實現相應的邏輯：

  @objc func segmentedControlChanged(_ sender: UISegmentedControl) {
         if sender.selectedSegmentIndex == 0 {
            pic.image = UIImage(named: "Logo") 
            // Also, if you want to resize your image view after set the new image, call sizeToFit() func here. 
         } else {
            pic.image = UIImage(named: "Profile")
            // And here. 
  }
}