在模擬器Swift中運行時發生CLLocationCoordinate2D錯誤

Question

我在模擬器中運行我的項目時不斷收到此錯誤。它只發生在xcode模擬器中。當我在手機上運行該項目時，它似乎完美地工作。

這裏是我的代碼：

extension QuadTreeNode: AnnotationsContainer { 

@discardableResult 
func add(_ annotation: MKAnnotation) -> Bool { 
    guard rect.contains(annotation.coordinate) else { return false } 

    switch type { 
    case .leaf: 
     annotations.append(annotation) 
     // if the max capacity was reached, become an internal node 
     if annotations.count == QuadTreeNode.maxPointCapacity { 
      subdivide() 
     } 
    case .internal(let children): 
     // pass the point to one of the children 
     for child in children where child.add(annotation) { 
      return true 
     } 

     fatalError("rect.contains evaluted to true, but none of the children added the annotation") 
    } 
    return true 
} 

@discardableResult 
func remove(_ annotation: MKAnnotation) -> Bool { 
    guard rect.contains(annotation.coordinate) else { return false } 

    _ = annotations.map { $0.coordinate }.index(of: annotation.coordinate).map { annotations.remove(at: $0) } 

    switch type { 
    case .leaf: break 
    case .internal(let children): 
     // pass the point to one of the children 
     for child in children where child.remove(annotation) { 
      return true 
     } 

     fatalError("rect.contains evaluted to true, but none of the children removed the annotation") 
    } 
    return true 
} 

private func subdivide() { 
    switch type { 
    case .leaf: 
     type = .internal(children: Children(parentNode: self)) 
    case .internal: 
     preconditionFailure("Calling subdivide on an internal node") 
    } 
} 

func annotations(in rect: MKMapRect) -> [MKAnnotation] { 

    // if the node's rect and the given rect don't intersect, return an empty array, 
    // because there can't be any points that lie the node's (or its children's) rect and 
    // in the given rect 
    guard self.rect.intersects(rect) else { return [] } 

    var result = [MKAnnotation]() 

    // collect the node's points that lie in the rect 
    for annotation in annotations where rect.contains(annotation.coordinate) { 
     result.append(annotation) 
    } 

    switch type { 
    case .leaf: break 
    case .internal(let children): 
     // recursively add children's points that lie in the rect 
     for childNode in children { 
      result.append(contentsOf: childNode.annotations(in: rect)) 
     } 
    } 

    return result 
} 
} 

的錯誤似乎在這行代碼調用發生：

_ = annotations.map { $0.coordinate }.index(of: annotation.coordinate).map { annotations.remove(at: $0) } 

，我得到的錯誤讀取：無法調用「索引」與「（CLLocationCoodinate2D）'的參數列表'

不知道爲什麼我只在模擬器中出現此錯誤。

Answer 1

在這種

_ = annotations.map { $0.coordinate }.index(of: annotation.coordinate) 

什麼註釋包含？由於某種原因，我想annotations.map { $0.coordinate }沒有返回數組CLLocationCoodinate2D。 因爲錯誤說明了這一點。

分配的東西像

coordinates = annotations.map { $0.coordinate } 

而且你會發現，座標是不是CLLocationCoodinate2D這就是爲什麼你不能打電話（作者：）指數數組中此陣列上。