Troubles, Gotchas, "Undocumented Features"

This page is a collection of things uncovered by the RubyMotion community. We expect, over time, many of these holes will be plugged. But, until then, if yourself frustrated and bewildered by a problem the answer may be here.

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App hangs on device although it works in simulator

Blocks

Returning from a function from within a block will work in the simulator, but will cause the app to hang indefinitely when run on an actual device. Here is an illustration of the problem:

Before:

 target.class.ancestors.each do |ancestor|
   if Teacup.handlers[ancestor].has_key? key
     NSLog "#{ancestor.name} is handling #{key} = #{value.inspect}" if target.resp
     Teacup.handlers[ancestor][key].call(target, value)
     return
   end
 end

Fixed:

 handled = false
 target.class.ancestors.each do |ancestor|
   if Teacup.handlers[ancestor].has_key? key
     NSLog "#{ancestor.name} is handling #{key} = #{value.inspect}" if target.resp
     Teacup.handlers[ancestor][key].call(target, value)
     #return
     handled = true
     break
   end
 end
 return if handled

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Be sure to also checkout this page.