Swift - 2 empty string arrays

Question

Trying to find out why sometimes this happens in swift/Xcode. When I check "employees.isEmpty" is returns correctly because it is empty. When is check "uids.isEmpty" it return empty as well but for some reason it thinks there are values and then executes my firebase call which of course crashes the app because the array is nil. Why does this happen? Same code. Same set up. Yet "employees.isEmpty" returns nil like it should (in my testing) and the other "uids.isEmpty" is empty but executes like there are values when there are not.

if employees.isEmpty == false {
    print("This shouldnt be called 1")
    OneSignal.postNotification(["contents": ["en": "\(message)"],
                                "include_player_ids": employees,
                                "headings": ["en": "Hey \(businessName)"],
                                "ios_badgeType": "Increase",
                                "ios_badgeCount": 1])
} else {
    print("Empty no execution")
}
print(employees)
print("Checking inside employees here")
print(uids)
print("Checking inside uids here")

if uids.isEmpty == false {
    print("This shouldnt be called 2")
    let pathing = ref.child("notification").child(uids).childByAutoId()
    pathing.setValue(values)
} else {
    print("Empty no execution")
}

They both print out the same when no values are assigned, just like this: "[]".

Declarations/Appending

var data:[String] = []
var dataUID:[String] = []


// GETTING THE ONESIGNAL ID'S FROM THE EMPLOYEES FOR NOTIFICATIONS
func getEmployees() {
    Database.database().reference().child("Businesses").child(self.otherUser?["uid"] as! String).child("registered_employees").observe(.childAdded, with: { (snapshot) in
        if snapshot.exists() {
           let data = snapshot.value as? NSDictionary
            let uid = data?["onesignal"] as? String
            self.data.append(uid!)
            print(self.data)
        } else {
            print("didnt call right values")
        }
    })
}

func getEmployeesUIDs() {
    Database.database().reference().child("Businesses").child(self.otherUser?["uid"] as! String).child("registered_employees").observe(.value, with: { (snapshot) in
        if snapshot.exists() {
            let data = snapshot.value as? NSDictionary
            let uid = data?["uid"] as? String
            self.dataUID.append(uid!)
            print(self.dataUID)
            print("Printing the employee uids right here")
        } else {
            print("didnt call right values")
        }
    })
}


let employees = self.data
let uids = self.dataUID.description

if employees.isEmpty {
                print("Empty no execution")
            } else {
                print("This shouldnt be called 1")
                OneSignal.postNotification(["contents": ["en": "\(message)"],
                                            "include_player_ids": employees,
                                            "headings": ["en": "Hey \(businessName)"],
                                            "ios_badgeType": "Increase",
                                            "ios_badgeCount": 1])
            }
            print(employees)
            print("Checking inside employees here")
            print(uids)
            print("Checking inside uids here")

            if uids.isEmpty {
                print("Empty no execution")
            } else {
                print("This shouldnt be called 2")
                let pathing = ref.child("notification").child(uids).childByAutoId()
                pathing.setValue(values)

            }

This is probably not relevant, but never say uids.isEmpty == false. isEmpty is already a Bool; do not compare it to something else. Just say if !uids.isEmpty. — matt
– matt, Commented Apr 18, 2019 at 15:54
As for actual question, it would probably help us to know how employees and uids are declared and how / when they are populated. You say the array is nil; that suggests it is an Optional. That could be important to know. And it might be that you are populating these arrays asynchronously, in which case there may be a code-out-of-order issue that you are not showing us yet. — matt
– matt, Commented Apr 18, 2019 at 15:56
You are checking inside a String in case of uids, not an Array. — OOPer
– OOPer, Commented Apr 18, 2019 at 16:19

rmaddy · Accepted Answer · 2019-04-18 19:09:51Z

1

if employees.isEmpty == false {
    print("This shouldnt be called 1")
    OneSignal.postNotification(["contents": ["en": "\(message)"],
                                "include_player_ids": employees,
                                "headings": ["en": "Hey \(businessName)"],
                                "ios_badgeType": "Increase",
                                "ios_badgeCount": 1])
} else {
    print("Empty no execution")

    print(employees)
    print("Checking inside employees here")
    print(uids)
    print("Checking inside uids here")}

    if uids.isEmpty == false {
        print("This shouldnt be called 2")
        let pathing = ref.child("notification").child(uids).childByAutoId()
        pathing.setValue(values)
    } else {
        print("Empty no execution")
    }

Try the above code. I have moved the part where you show the array in else so that if array is nil it will show.

edited Apr 18, 2019 at 19:09

rmaddy

320k44 gold badges548 silver badges591 bronze badges

answered Apr 18, 2019 at 16:40

Mohammad Yunus

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