我正在尝试关注this tutorial设置地理位置的地理位置,但我想使用从Firebase数据库中获取的一系列信息来创建地理围栏。有谁知道我会怎么做或有任何他们可以链接给我的教程?因为我对Swift很陌生,所以我很想知道如何做到这一点。有人可以帮忙解释一下我会做什么或者指向某个/某个可以解释这个问题的人吗?
答案 0 :(得分:1)
这样的事情:
func startMonitoring(_ manager:CLLocationManager, region:CLCircularRegion) {
if !CLLocationManager.isMonitoringAvailable(for: CLCircularRegion.self) {
print("Cannot monitor location")
return
}
if CLLocationManager.authorizationStatus() != .authorizedAlways {
print("Please grant access")
} else {
let locationManager = CLLocationManager()
locationManager.startMonitoring(for: region)
}
}
func getRegionForLocation(_ location:CLLocation) -> CLCircularRegion {
let radiusMeters:Double = 1000
let identifier = "MyGeofence \(location)"
let region = CLCircularRegion(center: location.coordinate, radius: radiusMeters, identifier: identifier)
region.notifyOnEntry = true
region.notifyOnExit = !region.notifyOnEntry
return region
}
func getLocationsFromFireBase() -> [CLLocation] {
var locations:[CLLocation] = []
// .. populate with locations from DB
return locations
}
//where you want to enable
let locationManager = CLLocationManager()
locationManager.requestAlwaysAuthorization()
let locations = getLocationsFromFireBase()
for location in locations {
let region = getRegionForLocation(location)
startMonitoring(locationManager, region: region)
}
我正在讨论如何启用位置访问(例如,您必须在info.plist中添加NSLocationAlwaysUsageDescription),但是会显示添加多个地理围栏的一般原则。您还需要向CLLocationManager添加委托,以便在设备进入或退出地理围栏时收到通知。