Linker command failed with Undefined symbols for architecture i386

ich versuche zu tun, die halbe Seite curl-Funktion. Dies ist der code den ich verwende:

#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;

Aber ich die folgenden Fehler treten

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)

Wie kann ich es lösen?

InformationsquelleAutor Xavi Valero | 2011-12-12