A problem with FBConnect for iphone

Target Platforms Mobile
1

I build a Xcode project form unity3D and drag the FBConnect group into the project which is build form unity3D. I also set the header search path ,but I get 29 link error. Have anyone can tell me what shall I do? 3Q^^

this is the error message what I get!

Undefined symbols:
  "_CGRectGetHeight", referenced from:
      -[FBDialog addRoundedRectToPath:rect:radius:] in FBDialog.o
  "_CGContextSetStrokeColorSpace", referenced from:
      -[FBDialog strokeLines:stroke:] in FBDialog.o
  "_CGAffineTransformScale", referenced from:
      -[FBDialog bounce1AnimationStopped] in FBDialog.o
      -[FBDialog show] in FBDialog.o
      -[FBDialog show] in FBDialog.o
  "_CGContextAddArcToPoint", referenced from:
      -[FBDialog addRoundedRectToPath:rect:radius:] in FBDialog.o
      -[FBDialog addRoundedRectToPath:rect:radius:] in FBDialog.o
      -[FBDialog addRoundedRectToPath:rect:radius:] in FBDialog.o
      -[FBDialog addRoundedRectToPath:rect:radius:] in FBDialog.o
  "_CGContextStrokeLineSegments", referenced from:
      -[FBDialog strokeLines:stroke:] in FBDialog.o
      -[FBDialog strokeLines:stroke:] in FBDialog.o
      -[FBDialog strokeLines:stroke:] in FBDialog.o
      -[FBDialog strokeLines:stroke:] in FBDialog.o
  "_CGAffineTransformMakeRotation", referenced from:
      -[FBDialog transformForOrientation] in FBDialog.o
  "_CGContextSetFillColor", referenced from:
      -[FBDialog drawRect:fill:radius:] in FBDialog.o
  "_CGColorSpaceRelease", referenced from:
      -[FBDialog drawRect:fill:radius:] in FBDialog.o
      -[FBDialog strokeLines:stroke:] in FBDialog.o
  "_CGContextSaveGState", referenced from:
      -[FBDialog addRoundedRectToPath:rect:radius:] in FBDialog.o
      -[FBDialog drawRect:fill:radius:] in FBDialog.o
      -[FBDialog strokeLines:stroke:] in FBDialog.o
  "_CGContextSetLineWidth", referenced from:
      -[FBDialog strokeLines:stroke:] in FBDialog.o
  "_CGContextAddRect", referenced from:
      -[FBDialog addRoundedRectToPath:rect:radius:] in FBDialog.o
  "_CGContextFillPath", referenced from:
      -[FBDialog drawRect:fill:radius:] in FBDialog.o
  "_CGContextFillRect", referenced from:
      -[FBDialog drawRect:fill:radius:] in FBDialog.o
  "_CGContextMoveToPoint", referenced from:
      -[FBDialog addRoundedRectToPath:rect:radius:] in FBDialog.o
  "_CGContextScaleCTM", referenced from:
      -[FBDialog addRoundedRectToPath:rect:radius:] in FBDialog.o
  "_CGContextRestoreGState", referenced from:
      -[FBDialog addRoundedRectToPath:rect:radius:] in FBDialog.o
      -[FBDialog drawRect:fill:radius:] in FBDialog.o
      -[FBDialog strokeLines:stroke:] in FBDialog.o
  "_CGContextBeginPath", referenced from:
      -[FBDialog addRoundedRectToPath:rect:radius:] in FBDialog.o
  "_CGRectGetMinX", referenced from:
      -[FBDialog addRoundedRectToPath:rect:radius:] in FBDialog.o
      -[FBDialog addRoundedRectToPath:rect:radius:] in FBDialog.o
  "_CGRectGetMinY", referenced from:
      -[FBDialog addRoundedRectToPath:rect:radius:] in FBDialog.o
      -[FBDialog addRoundedRectToPath:rect:radius:] in FBDialog.o
  "_CGColorSpaceCreateDeviceRGB", referenced from:
      -[FBDialog drawRect:fill:radius:] in FBDialog.o
      -[FBDialog strokeLines:stroke:] in FBDialog.o
  "_CGRectIsEmpty", referenced from:
      -[FBLoginButton initWithFrame:] in FBLoginButton.o
  "_CGRectInset", referenced from:
      -[FBDialog addRoundedRectToPath:rect:radius:] in FBDialog.o
      -[FBDialog keyboardWillShow:] in FBDialog.o
      -[FBDialog keyboardWillHide:] in FBDialog.o
  "_CGContextClosePath", referenced from:
      -[FBDialog addRoundedRectToPath:rect:radius:] in FBDialog.o
  "_CGRectZero", referenced from:
      _CGRectZero$non_lazy_ptr in FBLoginButton.o
  "_CGRectOffset", referenced from:
      -[FBDialog addRoundedRectToPath:rect:radius:] in FBDialog.o
      -[FBDialog drawRect:] in FBDialog.o
  "_CGContextTranslateCTM", referenced from:
      -[FBDialog addRoundedRectToPath:rect:radius:] in FBDialog.o
      -[FBDialog addRoundedRectToPath:rect:radius:] in FBDialog.o
  "_CGContextSetStrokeColor", referenced from:
      -[FBDialog strokeLines:stroke:] in FBDialog.o
  "_CGRectGetWidth", referenced from:
      -[FBDialog addRoundedRectToPath:rect:radius:] in FBDialog.o
  "_CGAffineTransformIdentity", referenced from:
      _CGAffineTransformIdentity$non_lazy_ptr in FBDialog.o
ld: symbol(s) not found
collect2: ld returned 1 exit status
2

try adding CoreGraphics.framework to the project