Linker command failed with Undefined symbols for architecture i386

catransition, ios4, iphone, page-curl

Solution

your app is complaining it can not find CATransition Symbol.

Did you add the QuartzCore framework to your app?

If not add it: go to your target settings -> build phases -> link binary -> select the + button and select QuartzCore.

then import it where you need to use it:

      #import <QuartzCore/QuartzCore.h>

Problem

i am trying to do the half page curl feature. This is the code I am using: ``` #import <QuartzCore/QuartzCore.h> CATransition *animation = [CATransition animation]; [animation setDelegate:self]; [animation setDuration:1.0f]; [animation setTimingFunction:UIViewAnimationCurveEaseInOut]; [animation setType:(notCurled ? @"mapCurl" : @"mapUnCurl")]; [animation setRemovedOnCompletion:NO]; [animation setFillMode: @"extended"]; [animation setRemovedOnCompletion: NO]; notCurled = !notCurled; ``` But I encounter the following errors ``` Undefined symbols for architecture i386: "_OBJC_CLASS_$_CATransition", referenced from: objc-class-ref in MyMapViewController.o ld: symbol(s) not found for architecture i386 clang: error: linker command failed with exit code 1 (use -v to see invocation) "_OBJC_CLASS_$_CATransition", referenced from: objc-class-ref in SJMapViewController.o ld: symbol(s) not found for architecture i386 clang: error: linker command failed with exit code 1 (use -v to see invocation) ``` How can I solve it?

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