The simplest way to output to the console from your RubyMotion app is to use
puts
. This works fine when your app is running in the simulator. However,
puts
does not output to the console when your app is running on the device
itself.
You can view the live logs while your app is running on your usb connected device via:
$ motion device:console
You will see messages from your application alongside those from other apps or the system itself.
Instead of using puts
, you’ll need to make use of NSLog
. For example
NSLog("My debug messge")
Note, however, that the first argument for NSLog
is actually a String Format Specifier.
The following are equivalent:
puts "A #{variable} goes here"
NSLog("A %@ goes here", variable)
Just remember that any NSLog
messages you leave in your app will be visible
to the curious, even after you’ve released to the App Store.