分段控件，以编程方式更改UIImageView Swift 4/5

Question

I've included the code to my segmented control and UIImageView. Any help would be great, thanks.

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
    }()

The picture is supposed to change and enable the touch gesture but neither of them works.

Answer 1

将If-else块移动到handleSegmentedControlChange选择器。

Answer 2

1) Create a @objc func that receive as a parameter (_ sender: UISegmentedControl) , for example:

@objc func segmentedControlChanged(_ sender: UISegmentedControl)

2) After create your UISegmentedControl, use addTarget, like this:

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

3) In the func that you created, implement the corresponding logic:

  @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. 
  }
}