需要幫助將mapKit註釋鏈接到Swift中的CollectionView

Question

我在swift中構建了一個應用程序，該應用程序在同一頁面上具有集合視圖和地圖視圖。用戶可以滾動瀏覽收藏視圖以查看優惠（這是應用的目的），並且地圖視圖中填充了註釋引腳，用於在地圖上顯示優惠的實際位置。

我的問題是，我發現很難收集觀察室鏈接到正確的註釋。

我的註釋添加到地圖如下：

for location in self.queryDataMapAnnotations { 
      let annotation = MKPointAnnotation() 
      annotation.title = location["title"] as? String 
      annotation.subtitle = location["distance"] as? String 
      annotation.coordinate = CLLocationCoordinate2D(latitude: location["latitude"] as! Double, longitude: location["longitude"] as! Double) 
      self.mapView.addAnnotation(annotation) 

     } 

我則可以通過收集的滾動視圖細胞

func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell { 

     // get a reference to our storyboard cell 
     let cell = collectionView.dequeueReusableCell(withReuseIdentifier: reuseIdentifier, for: indexPath as IndexPath) as! MyCollectionViewCell 


     // Connect cell to the linked annotation 

     // ** This links to a random annotation, but not the correct one - need help on this please ** 
     self.mapView.selectAnnotation(self.mapView.annotations[row], animated: true) 

    } 

如果任何人能幫助我如何收集鏈接查看正確的地圖註釋，我會是最有幫助的。我只知道很快（一點點），所以會欣賞那種語言的幫助。由於

Answer 1

如果你想活動地圖標註更改爲你滾動，你要考慮垂直居中收集細胞是當前顯示的 - 這裏是我想出了辦法。

注：我沒有測試它，它只是

func scrollViewDidScroll(_ scrollView: UIScrollView) { 
    if scrollView is UICollectionView { 
     let collectionViewCenter = CGPoint(x: collectionView.bounds.size.width/2 + collectionView.contentOffset.x, y: collectionView.bounds.size.height/2 + collectionView.contentOffset.y) 
     let centredCellIndexPath = collectionView.indexPathForItem(at: collectionViewCenter) 

     guard let path = centredCellIndexPath else { 
      // There is no cell in the center of collection view (you might want to think what you want to do in this case) 
      return 
     } 

     if let selectedAnnotation = mapView.selectedAnnotations.first { 
      // Ignore if correspondent annotation is already selected 
      if selectedAnnotation.isEqual(self.mapView.annotations[path.row]) { 
       self.mapView.selectAnnotation(self.mapView.annotations[path.row], animated: true) 
      } 
     } 
    } 
} 

Answer 2

我也有類似的功能，用戶滾動，顯示附近的優惠和MapView類的相機應該轉移到列表中的CollectionView的基本思路在集合視圖當前可見的交易位置，下面介紹我的實現

func scrollViewWillEndDragging(scrollView: UIScrollView, withVelocity velocity: CGPoint, targetContentOffset: UnsafeMutablePointer<CGPoint>){ 
     /* set pagewidth to collectionview cell width*/ 
     let pageWidth = collectionView.bounds.width 
     let currentOffset : Float = Float(scrollView.contentOffset.x) 
     let targetOffset = Float(targetContentOffset.memory.x) 
     var newTargetOffset : Float = 0.0 

     if targetOffset > currentOffset { 
      newTargetOffset = ceilf(currentOffset/(pageWidth)) * pageWidth 
      /* if colelctionview swipped right increment the curentlyVisibleIndex*/ 
     //dealList is array of Model objects used to populate the 
       //CollectionView 
      if currentlyVisibleIndex != (dealList.count - 1) { 
       currentlyVisibleIndex += 1 
      } 
     } 
     else{ 
      newTargetOffset = floorf(currentOffset/(pageWidth)) * pageWidth 
      /*if collectionview swipped left decrement the currentlyVisibleCounter */ 
      if currentlyVisibleIndex != 0 { 
       currentlyVisibleIndex -= 1 
      } 
     } 
     if newTargetOffset < 0{ 
      newTargetOffset = 0 
     }else if newTargetOffset > Float(scrollView.contentSize.width){ 
      newTargetOffset = Float(scrollView.contentSize.width) 
     } 
     targetContentOffset.memory.x = CGFloat(currentOffset) 
     scrollView.setContentOffset(CGPoint(x: CGFloat(newTargetOffset), y: 0), animated: true) 

     moveCameraToDealLocation() 
     // re initialise the annotations of mapView 
     let annotationArray = mapBoxViewController.mapView.annotations 
     mapBoxViewController.mapView.removeAnnotations(annotationArray) 
     mapBoxViewController.mapView.addAnnotations(annotationArray) 
    } 

    func moveCameraToDealLocation(){ 
     mapBoxViewController.moveMapViewCameraToLocation(CLLocationCoordinate2D(latitude: dealList[currentlyVisibleIndex].eventLatitude, longitude: dealList[currentlyVisibleIndex].eventLongitude)) 
    } 

currentlyVisibleIndex給我當前可見的交易（註釋）的指數，functi moveCameraToDealLocation將MapView相機移動到該註釋。 不要讓我知道，如果這對你的作品:)