UIView 不出現

Question

我正在開發一個基於地圖的應用程序，用戶可以在其中選擇地圖注釋，然后 UIView 必須與數據庫中的照片一起出現，但我按下注釋沒有任何反應

這是代碼

import UIKit
import MapKit
import CoreLocation
import Firebase
import FirebaseStorage

class MapViewController: UIViewController, CLLocationManagerDelegate {
    
    
    @IBOutlet weak var MapButton: UITabBarItem!
    @IBOutlet weak var mapView: MKMapView!

> Here is the UIView that must appear after user selected an annotation

    @IBOutlet var addView: UIView!
    @IBOutlet weak var URLImageView: UIImageView!

     override func viewDidLoad() {
           addView.layer.cornerRadius = 5
     }

    func animateIn() {
        self.view.addSubview(addView)
        addView.center = self.view.center
        
        addView.transform = CGAffineTransform.init(scaleX: 1.3, y: 1.3)
        addView.alpha = 0
        
        UIView.animate(withDuration: 0.3) {
            self.addView.alpha = 1
            self.addView.transform = CGAffineTransform.identity
        }
    }
    
    func animateOut() {
        UIView.animate(withDuration: 0.3) {
            self.addView.transform = CGAffineTransform.init(scaleX: 1.3, y: 1.3)
            self.addView.alpha = 0
        } completion: { (success:Bool) in
            self.addView.removeFromSuperview()
        }

    }

這是當用戶選擇注釋時激活方法的方法。 它在數據庫中尋找圖像並檢索它，我用一個簡單的 UIInageView 嘗試過，它工作得很棒，它檢索圖像並將其放入圖像視圖中，但我需要對其進行自定義，因此我創建了一個必須出現的自定義 UIView當用戶按下注釋時

   func mapView(_ mapView: MKMapView, didSelect view: MKAnnotationView) {
        var coord = self.selectedAnnotation
        coord = view.annotation as? MKPointAnnotation
        let codeLat = coord?.coordinate.latitude
        let codeLon = coord?.coordinate.longitude

        animateIn()
        
        let db = Firestore.firestore()
        
        db.collection("locations").getDocuments() { [self] (querySnapshot, err) in
            if let err = err {
                print("Error getting documents: \(err)")
            } else {
                for document in querySnapshot!.documents {
                    if let coords = document.get("pinLocation") {
                        let point = coords as! GeoPoint
                        let lat = point.latitude
                        let lon = point.longitude
                        if codeLat == lat && codeLon == lon {
                            let imageUrl = document.data()["url"]
                            print(imageUrl!)
                            let er = "not found"
                            let url = URL(string: "\(imageUrl ?? er)")!
                            DispatchQueue.global().async {
                                if let data = try? Data(contentsOf: url) {
                                    DispatchQueue.main.async {
                                        self.ecoURLImageView.image = UIImage(data: data)
                                        URLImageView.layer.cornerRadius = 10
                                        URLImageView.clipsToBounds = true
                                        URLImageView.layer.borderColor = UIColor.systemGreen.cgColor
                                        URLImageView.layer.borderWidth = 3
                                    }
                                }
                            }
                        }
                    }
                }
            }
        }

}

Answer 1

看起來您還沒有為您的視圖設置框架。

嘗試

self.myView.frame = CGRect(X:0,y:0,width:100,height:100)
self.view.addSubview(myView)

Answer 2

如果您在 Storyboard 中添加了一個 UI 元素，您不希望將它重新添加到視圖層次結構中或從視圖層次結構中刪除它。

像這樣嘗試：

class MapViewController: UIViewController, CLLocationManagerDelegate {
    
    
    @IBOutlet weak var MapButton: UITabBarItem!
    @IBOutlet weak var mapView: MKMapView!
    
    // > Here is the UIView that must appear after user selected an annotation
    
    @IBOutlet var addView: UIView!
    @IBOutlet weak var URLImageView: UIImageView!
    
    override func viewDidLoad() {
        addView.layer.cornerRadius = 5
        
        // hide addView on load
        self.addView.isHidden = true
    }
    
    func animateIn() {

        // un-hide addView
        self.addView.isHidden = false
        
        // it's already in the view hierarchy - so don't add it!!!
        //self.addView.removeFromSuperview()
        //self.view.addSubview(addView)
        
        addView.center = self.view.center
        
        addView.transform = CGAffineTransform.init(scaleX: 1.3, y: 1.3)
        addView.alpha = 0
        
        UIView.animate(withDuration: 0.3) {
            self.addView.alpha = 1
            self.addView.transform = CGAffineTransform.identity
        }
    }
    
    func animateOut() {
        UIView.animate(withDuration: 0.3) {
            self.addView.transform = CGAffineTransform.init(scaleX: 1.3, y: 1.3)
            self.addView.alpha = 0
        } completion: { (success:Bool) in
            // hide addView
            self.addView.isHidden = true
            
            // don't remove it from superview
            //self.addView.removeFromSuperview()
        }
        
    }
}