Question

嘿，我目前正在开发一款小应用程序，但我的内存使用方式很高。该应用程序有大约200个地图注释，这些添加像

    //Number: 1 Airport: Lukla  - Mount Everest
    let location1:CLLocationCoordinate2D = CLLocationCoordinate2DMake(AirportLat[1], AirportLong[1])
    let info1 = CustomPointAnnotation()
    info1.coordinate = location1
    info1.title = AirportTitle[1]
    info1.imageName = AirportimageName[1]
    Map.addAnnotation(info1)

    //Number: 2 Airport: Helgoland 
    let location2:CLLocationCoordinate2D = CLLocationCoordinate2DMake(AirportLat[2], AirportLong[2])
    let info2 = CustomPointAnnotation()
    info2.coordinate = location2
    info2.title = AirportTitle[2]
    info2.imageName = AirportimageName[2]
    Map.addAnnotation(info2)

    //Number: 3 Airport: Aspen 
    let location3:CLLocationCoordinate2D = CLLocationCoordinate2DMake(AirportLat[3], AirportLong[3])
    let info3 = CustomPointAnnotation()
    info3.coordinate = location3
    info3.title = AirportTitle[3]
    info3.imageName = AirportimageName[3]
    Map.addAnnotation(info3)

从我这里，所以我得到了一些阵列但是由它自己创建每个注释（但所有“阵列只是逐个计数”）我确定有更好的方法来做到这一点，任何人都可以给我一些tipps如何减少这个，也许为此使用for / while？ :(我没有任何工作

Answer 1

枚举其中一个数组，然后创建一个注释数组。然后，您可以一次将所有注释添加到地图视图中。

var allAnnotations =  [CustomPointAnnotation]()
for (index, value) in enumerate(AirportLat){
  let annotation = CustomPointAnnotation()
  annotation.coordinate = CLLocationCoordinate2DMake(AirportLat[index], AirportLong[index])
  annotation.title = AirportTitle[index]
  annotation.imageName = AirportimageName[index]
  allAnnotations += [annotation]
}   

Map.addAnnotations(allAnnotations)

Swift - 地图注释的更好方法

1 个答案: