swift - 函数不返回字符串

Question

所以我要重新开始编程，但遇到了问题。当我在其中存储一个值时，我的函数没有返回值。你们能看看并指出我为什么会这样吗？

func getLocation() -> NSString {
    manager = OneShotLocationManager()
    var tempLocation: NSString = "" // created an empty string for the var

    manager!.fetchWithCompletion {location, error in
        if let locatie = location {
            tempLocation = String(locatie.coordinate.latitude) + "," + String(locatie.coordinate.longitude)
            print(tempLocation) // It stores a value here but will not show it on the return
        } else if let err = error {
            tempLocation = err.localizedDescription
        }
        self.manager = nil
    }
    return tempLocation // It's not returning anything here.. 
}

Answer 1

退出函数后开始完成，所以我猜这就是问题所在。你返回 ""然后在完成代码中做一些事情