Getting hash values from object in swift

Question

In Swift, when I'm typing

var controller : GCController
// fetch some data to conbroller
NSLog("Controller: %@",controller)

NSLog prints nice

Controller: <GCController 0x1700a7680 vendorName='Remote' deviceHash=0x414e6d3d6a8c2215>

wheres vendorName is public variable in GCController, but the deviceHash is not. Can I somehow access the value? Even as plain string? From where NSLog takes the values? I tried making NSString in similar format, but it didn't give me the expected results

From logs what I can figure out it's assigned by system unique for each controller identifier. — Szymon Sirocki, Jul 22 '16 at 10:11
In that case you can refer this :http://stackoverflow.com/questions/24760150/how-to-get-a-hashed-device-id-for-testing-admob-on-ios — Vishal Sonawane, Jul 22 '16 at 10:19
You are using swift very Objective-C-like... Why is that? Why not just do print("Controller:" + controller) ? — Jack, Jul 22 '16 at 14:14
I guess, because I am coming from C and Obj-C, thanks for the tip. — Szymon Sirocki, Jul 23 '16 at 08:54

score 1 · Accepted Answer · answered Jul 22 '16 at 19:11

1

NSLog is probably showing you the GCController's debugDescription property whereas print and the likes will show you the description property.

answered Jul 22 '16 at 19:11

Alain T.

40,517
4
31
51

Is the debugDescritpion available in release build also? Or only in debug one? – Szymon Sirocki Jul 23 '16 at 08:59
I don't see why it wouldn't be (that should easily be verifiable by simply building in release mode). It may be a bit risky to rely on the format of the string to extract the hash out of it. Unlikely as it may sound, Apple could make changes to the framework in a future release and invalidate your string parsing logic. I believe that when there is no connected controller, that string is a bit different as well. – Alain T. Jul 23 '16 at 11:52
Isn't there any C#-like reflection to access this value? I've read that it reflects it's hashValue, it isn't hashtable of all values, right? It's only computing hash for comparisons? – Szymon Sirocki Jul 24 '16 at 11:21

Getting hash values from object in swift

1 Answers1