ios - swift 全局变量字符串返回 nil

Question

在 Swift 4 中无法调用存储在全局变量中的值这是代码看起来像

var coord : String!

func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {

    let locValue: CLLocationCoordinate2D = (manager.location?.coordinate)!
    print("Locations : \(locValue.latitude), \(locValue.longitude)")

    let lat: String = String(format:"%f", locValue.latitude)
    let lon: String = String(format:"%f", locValue.longitude)
    let node = lat + "," + lon
    self.coord = node
    print("Coordinate", node)
    }

然后我尝试在另一个函数中调用它，

func getAddress(){
    let location = coord
}

但它返回为 nil谁能告诉我我在这里错过了什么

Answer 1

你必须为坐标变量分配内存。喜欢，

变量坐标 = 字符串()