Matching data type in Swift

Question

I'm using BeaconKit to detect near beacons around.

I want to check if the beacon detected is of type AltBeacon. My code is showing an error because of the matching expression I'm using.

if beacon.beaconType == AltBeacon { print("Detected an AltBeacon") }

Here is the error message I'm getting

Binary operator == cannot be applied to operands of type Int' and AltBeacon.Type

What can I use instead so I can correct my matching expression please ! Thank you

Possible duplicate of Checking if an object is a given type in Swift — wootage
– wootage, Commented Oct 24, 2019 at 13:58

score 1 · Accepted Answer · 2019-10-24 14:45:24Z

Have you tried

if beacon.beaconType is AltBeacon { print("Detected an AltBeacon") }

or instead, you can check

if let beacon.beaconType as? AltBeacon { print("Detected an AltBeacon") } else { // handle }

Actually according to the source code both if expressions will always evaluate to false.

vadian · Accepted Answer · 2019-10-24 14:40:30Z

The error is clear. beaconType is an Int. It cannot be compared with anything else but an Int

Two possible solutions:

Figure out the integer value of AltBeacon (2 is just an example) and compare
```
if beacon.beaconType == 2 { ... 
```
As AltBeacon is a subclass of Beacon check the type of the instance
```
if beacon is AltBeacon { ... 
```

2 Answers 2