Question

我在模拟器中运行项目时遇到此错误。它只发生在xcode模拟器中。当我在手机上运行项目时，它似乎完美无缺。

这是我的代码：

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
}
}

在代码中调用此行时似乎发生错误：

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

我得到的错误读取：无法使用类型'（of：CLLocationCoodinate2D）'的参数列表调用'index'

不确定为什么我只在模拟器中出现此错误。

Answer 1

在此

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

注释包含哪些内容？我猜annotations.map { $0.coordinate }由于某种原因没有返回CLLocationCoodinate2D数组。因为错误说明了这一点。

分配类似

的内容

coordinates = annotations.map { $0.coordinate }

你会发现坐标不是CLLocationCoodinate2D的数组，这就是为什么你不允许在这个数组上调用index（of :)的原因。

在Simulator Swift中运行时出现CLLocationCoordinate2D错误

1 个答案: