Question

whenever I am adding an openflow library and execute, this error occur

Undefined symbols:
  "_CATransform3DIdentity", referenced from:
      _CATransform3DIdentity$non_lazy_ptr in AFOpenFlowView.o
     (maybe you meant: _CATransform3DIdentity$non_lazy_ptr)
  "_CATransform3DRotate", referenced from:
      -[AFOpenFlowView(hidden) setUpInitialState] in AFOpenFlowView.o
      -[AFOpenFlowView(hidden) setUpInitialState] in AFOpenFlowView.o
ld: symbol(s) not found
collect2: ld returned 1 exit status

Any one have any idea about it?

Answer 1

You need to add the “QuartzCore” framework to your app. The library you are using probably needs this framework, so your app needs to import this framework in order to compile.