Swift中uipangestruerecognizer的奇怪问题

我正试图添加潘手势我的看法,但我不知道为什么它不想工作。以下是我的UIView代码:

    self.infoView = UIView()
    self.mapView.addSubview(infoView)
    infoView.backgroundColor = .white
    infoView.layer.cornerRadius = 10.0
    infoView.layer.masksToBounds = true
    infoView.isUserInteractionEnabled = true
    infoView.translatesAutoresizingMaskIntoConstraints = false

    let panGesture = UIPanGestureRecognizer(target: self, action: #selector(self.moveInfoView(recognizer:)))
    infoView.addGestureRecognizer(panGesture)

我正在我的生活中定义它 UIViewController 作为:

var infoView: UIView!

我的平移手势方法如下所示:

@objc func moveInfoView(recognizer:UIPanGestureRecognizer) {
    let translation = recognizer.translation(in: self.view)
    if let view = recognizer.view {
        view.center = CGPoint(x:view.center.x + translation.x,
                              y:view.center.y + translation.y)
    }
    recognizer.setTranslation(CGPoint.zero, in: self.view)
}

更新

我的限制:

let constraints = [
        // InfoView constraints
        NSLayoutConstraint(item: infoView, attribute: .bottom, relatedBy: .equal, toItem: self.view.safeAreaLayoutGuide, attribute: .bottom, multiplier: 1.0, constant: 0.0),
        NSLayoutConstraint(item: infoView, attribute: .leading, relatedBy: .equal, toItem: self.view, attribute: .leading, multiplier: 1.0, constant: 0.0),
        NSLayoutConstraint(item: infoView, attribute: .trailing, relatedBy: .equal, toItem: self.view, attribute: .trailing, multiplier: 1.0, constant: 0.0),
        infoViewHeightConstraint]

哪里

let infoViewHeightConstraint = infoView.heightAnchor.constraint(greaterThanOrEqualToConstant: 112.0)