Swift 在另一个函数中使用变量

Question

如何从 callTestArray() 中的 locationManager() 调用 testArray？我尝试输出它，但似乎不起作用。我也尝试在类的顶部声明，但它总是nil。

func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
    let userLocation:CLLocation = locations[0] as CLLocation
    let rootRef = Database.database().reference()
    let geoRef = GeoFire(firebaseRef: rootRef.child(“X”))
    let query = geoRef.query(at: userLocation, withRadius: 1000)

    query.observe(.keyEntered, with: { key, location in
        self.testArray.insert(key, at: self.testArray.count)
    })
}

func callTestArray() {
    var testOuput = testArray[0]
}

Answer 1

尝试这种方法:

func locationManager(_ manager: String, didUpdateLocations locations: String, completion: @escaping () -> Void) {
   let userLocation:CLLocation = locations[0] as CLLocation
   let rootRef = Database.database().reference()
   let geoRef = GeoFire(firebaseRef: rootRef.child(“X”))
   let query = geoRef.query(at: userLocation, withRadius: 1000)
   query.observe(.keyEntered, with: { key, location in
       self.testArray.append(key)
       completion()
   })
}

用法:

locationManager(XXXXXX, didUpdateLocations: YYYYYY) {
    callTestArray()
}