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swift - 使用标签组合@objc func方法

问题描述

我的代码使用 UIPan gestureRecongnizzer 声明了 2 个不同的 @objc func 方法。我认为有一种方法可以使用标签仅使用 1 个 objc func 方法。当前所做的所有功能都是移动图像视图。我不知道标签是否是最好的方法，我对其他解决方案持开放态度，我只想要 1 个功能。具体看pgGestureMethod和sgGestureMethod。

   var pg = UIImageView()
var pgGesture = UIPanGestureRecognizer()
var pgCon = [NSLayoutConstraint]()

var sg = UIImageView()
var sgGesture = UIPanGestureRecognizer()
var sgCon = [NSLayoutConstraint]()

    override func viewDidLoad() {
    super.viewDidLoad()
  [pg,sg].forEach({
        $0.translatesAutoresizingMaskIntoConstraints = false
        self.view.addSubview($0)
        $0.isUserInteractionEnabled = true

    })
    pgGesture = UIPanGestureRecognizer(target: self, action: #selector(ViewController.pgGestureMethod(_:)))
    pg.addGestureRecognizer(pgGesture)


    sgGesture = UIPanGestureRecognizer(target: self, action: #selector(ViewController.sgGestureMethod(_:)))
    sg.addGestureRecognizer(sgGesture)

}

    @objc func pgGestureMethod(_ sender: UIPanGestureRecognizer){

    self.view.bringSubviewToFront(pg)
    let tranistioon = sender.translation(in: self.view)
    pg.center = CGPoint(x: pg.center.x + tranistioon.x, y: pg.center.y + tranistioon.y)
    sender.setTranslation(CGPoint.zero,in: self.view)


}
@objc func sgGestureMethod(_ sender: UIPanGestureRecognizer){

    let tranistioon = sender.translation(in: self.view)
    sg.center = CGPoint(x: sg.center.x + tranistioon.x, y: sg.center.y + tranistioon.y)
    sender.setTranslation(CGPoint.zero,in: self.view)


}

标签： swifttagsuipangesturerecognizerfunc

解决方案

欢迎来到 Stackoverflow。

因此，在您的情况下，您可以了解从手势函数中的参数调用了哪个手势。

class SomeViewController: UIViewController {
  var pg = UIImageView()
  var pgGesture = UIPanGestureRecognizer()
  var pgCon = [NSLayoutConstraint]()

  var sg = UIImageView()
  var sgGesture = UIPanGestureRecognizer()
  var sgCon = [NSLayoutConstraint]()

  override func viewDidLoad() {
    super.viewDidLoad()

    [pg,sg].forEach {[unowned self] in
      $0.translatesAutoresizingMaskIntoConstraints = false
      self.view.addSubview($0)
      $0.isUserInteractionEnabled = true
    }

    pgGesture = UIPanGestureRecognizer(target: self, action: #selector(gestureDidRecognize(_:)))
    pg.addGestureRecognizer(pgGesture)

    sgGesture = UIPanGestureRecognizer(target: self, action: #selector(gestureDidRecognize(_:)))
    sg.addGestureRecognizer(sgGesture)
  }
}

@objc private extension SomeViewController {
  func gestureDidRecognize(_ gesture: UIPanGestureRecognizer){
    guard let gestureView = gesture.view else { return }

    let transition = gesture.translation(in: view)

    switch gesture {
      case pgGesture:
        view.bringSubviewToFront(pg)

      default: break
    }

    gestureView.center = CGPoint(
      x: gestureView.center.x + transition.x, 
      y: gestureView.center.y + transition.y)

    gesture.setTranslation(.zero, in: view)
  }
}

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