didSelect为MKAnnotationView没有射击

Question

我有麻烦可以在MapView中选择自定义注释。我尝试几种方法，都没有成功：

• 使用MKMapViewDelegate的didSelect
• 使用的UIButton被添加到AnnotationView
• 使用UITapGestureRecognizer的ImageView的，它应该用于注释

你可以找到所有这些方法在下面的代码注释：

override func viewDidLoad() { 
    super.viewDidLoad() 
    // some more initialization code 

    for item in items { 
     let annotation = IdentifiedMKPointAnnotation() // has only one additional property named "id" 

     annotation.coordinate = CLLocationCoordinate2D(latitude: item.spots[0].latitude!, longitude: item.spots[0].longitude!) 
     annotation.id = i 

     self.mapView.addAnnotation(annotation) 

     i += 1 
    } 
} 


// MARK: - MapViewDelegate 
func mapView(_ mapView: MKMapView, viewFor annotation: MKAnnotation) -> MKAnnotationView? { 
    let item = self.items[(annotation as! IdentifiedMKPointAnnotation).id!] 

    let annotationView = MKAnnotationView(annotation: annotation, reuseIdentifier: "") 
    //annotationView.canShowCallout = false 
    //annotationView.isEnabled = false 

    let imageView = UIImageView() 
    imageView.frame.size = CGSize(width: 40, height: 40) 
    imageView.layer.cornerRadius = 20 
    imageView.layer.masksToBounds = true 
    imageView.af_setImage(withURL: URL(string: item.images.count > 0 ? item.images[0] : item.image!)!) 
    imageView.contentMode = .scaleAspectFill 

    //let gr = UIGestureRecognizer(target: self, action: #selector(annotationSelected(_:))) 
    //imageView.addGestureRecognizer(gr) 
    //imageView.isUserInteractionEnabled = true 

    //let button = UIButton() 
    //button.frame.size = CGSize(width: 40, height: 40) 
    //button.setImage(#imageLiteral(resourceName: "play_arrow"), for: .normal) 
    //button.addTarget(self, action: #selector(annotationSelected(_:)), for: .touchUpInside) 

    annotationView.addSubview(imageView) 
    //annotationView.addSubview(button) 

    return annotationView 
} 

func mapView(_ mapView: MKMapView, didSelect view: MKAnnotationView) { 
    performSegue(withIdentifier: "showDetail", sender: self.items[(view.annotation as! IdentifiedMKPointAnnotation).id!]) 

    view.setSelected(false, animated: false) 
} 

func annotationSelected(_ sender: UIImageView) { 
    performSegue(withIdentifier: "showDetail", sender: self.items[((sender.superview as! MKAnnotationView).annotation as! IdentifiedMKPointAnnotation).id!]) 
} 

任何想法为什么这个动作不是/不是正在射击？

Answer 1

刚刚发现基于以下职位的解决方案：https://stackoverflow.com/a/28671680/6010489

这足以设置annotationview的高度和宽度：

annotationView.frame.size.height = 40 
annotationView.frame.size.width = 40 

Answer 2

如果注释的title为空，则不调用didSelect委托。尝试下面的代码。

let annotation = IdentifiedMKPointAnnotation() 
annotation.title = "title"