Swift 3:如何在 Google 地图中删除跟踪的折线 [英] Swift 3: How to remove the tracked polyline in Google map

问题描述

我已经绘制了折线，但我不知道什么编码可以删除谷歌地图中跟踪的折线.我正在尝试在下面进行一些编码.

<小时>

这是行不通的.

var polyline = GMSPolyline()polyline.map = nil

<小时>

这正在努力删除跟踪的折线，但是当我制作标记并点击它时，标记无法播种信息窗口.

mapView.clear()

谢谢

解决方案

解决方案:

1. 创建折线:通过 GoogleMapsAPI 教学折线
2. 创建变量 oldPolylineArr/oldPolyline 类型 GMSPolyline/GMSPolyline_Array
3. 将折线存储到旧折线
4. 删除多段线

样本编码:

//第一步:var mapView = GMSMapView()让路径 = GSMutablePath()path.add(CLLocationCoordinate2D(纬度:37.36，经度:-122.0))path.add(CLLocationCoordinate2D(纬度:37.45，经度:-122.0))path.add(CLLocationCoordinate2D(纬度:37.45，经度:-122.2))path.add(CLLocationCoordinate2D(纬度:37.36，经度:-122.2))path.add(CLLocationCoordinate2D(纬度:37.36，经度:-122.0))让矩形 = GMSPolyline(路径:路径)//第2步:var oldPolylineArr = [GMSPolyline]()

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数组

//第三步:oldPolyline.append(矩形)//步骤4:对于 p in (0 ..< oldPolylineArr.count) {oldPolylineArr[p].map = nil}

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不是数组

//第三步:旧折线 = 折线//步骤4:oldPolyline.map = nil

I have draw the polylines, but I don't no that what coding can remove the tracked polyline in the google map. I'm trying some coding in below.

---

this is no working.

var polyline = GMSPolyline()
   polyline.map = nil 

---

this is working to remove tracked polyline, but when I'm maked the markers and tap it, marker can not sow the info window.

mapView.clear()

Thank you

解决方案

Solution:

1. create polyline: teaching polyline by GoogleMapsAPIs
2. create variable oldPolylineArr/oldPolyline type GMSPolyline/GMSPolyline_Array
3. store the polyline to the oldPolyline
4. remove the polyline

Sample Coding:

//Step 1:
var mapView = GMSMapView()
let path = GMSMutablePath()
path.add(CLLocationCoordinate2D(latitude: 37.36, longitude: -122.0))
path.add(CLLocationCoordinate2D(latitude: 37.45, longitude: -122.0))
path.add(CLLocationCoordinate2D(latitude: 37.45, longitude: -122.2))
path.add(CLLocationCoordinate2D(latitude: 37.36, longitude: -122.2))
path.add(CLLocationCoordinate2D(latitude: 37.36, longitude: -122.0))
let rectangle = GMSPolyline(path: path)

//Step 2:
var oldPolylineArr = [GMSPolyline]()

Array

//Step 3:
oldPolyline.append(rectangle)

//Step 4:
for p in (0 ..< oldPolylineArr.count) {
    oldPolylineArr[p].map = nil
}

is NOT Array

//Step 3:
oldPolyline = polyline

//Step 4:
oldPolyline.map = nil

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