How can I output this function to be a simple string? - swift

Question

I am trying to get access to the private IP in my app and I have the following code which gets the local IP and returns it. The issue is that it is returning a [String] not String and every time I try and use it I get an error. Here is the code (from How to get Ip address in swift):
func getIFAddresses() -> [String] {
var addresses = [String]()
// Get list of all interfaces on the local machine:
var ifaddr : UnsafeMutablePointer<ifaddrs> = nil
if getifaddrs(&ifaddr) == 0 {
// For each interface ...
for (var ptr = ifaddr; ptr != nil; ptr = ptr.memory.ifa_next) {
let flags = Int32(ptr.memory.ifa_flags)
var addr = ptr.memory.ifa_addr.memory
// Check for running IPv4, IPv6 interfaces. Skip the loopback interface.
if (flags & (IFF_UP|IFF_RUNNING|IFF_LOOPBACK)) == (IFF_UP|IFF_RUNNING) {
if addr.sa_family == UInt8(AF_INET) || addr.sa_family == UInt8(AF_INET6) {
// Convert interface address to a human readable string:
var hostname = [CChar](count: Int(NI_MAXHOST), repeatedValue: 0)
if (getnameinfo(&addr, socklen_t(addr.sa_len), &hostname, socklen_t(hostname.count),
nil, socklen_t(0), NI_NUMERICHOST) == 0) {
if let address = String.fromCString(hostname) {
addresses.append(address)
}
}
}
}
}
freeifaddrs(ifaddr)
}
print(addresses)
return addresses
}
and here is how I am trying to use it:
self.privateIp.title = getIFAddresses()
However when I do this, I get an error:
Cannot assign a value of type "[String]" to a value of type "String".
If I try and cast it like this:
self.privateIp.title = getIFAddresses() as! String
I get the following error:
Cast from '[String]' to unrelated type 'String' always fails.

Answer 1

[String] is an array of string so it can contain more than one item.
If you want first element from the array you can use:
if let ipAdd = getIFAddresses().first {
self.privateIp.title = ipAdd
}
It's equivalent to getIFAddresses()[0] but more safety because if the array is empty call to getIFAddresses()[0] will crash your app.
You can call last to get the last one or you can enumerate all of the items inside the array.