新浪微博iOS SDK UIImage+WBSDKResize.o

Undefined symbols for architecture armv7:
  "_kCGImageSourceThumbnailMaxPixelSize", referenced from:
      +[UIImage(WBSDKResize) wbsdk_resizeImageToMaxSize:sourcePath:] in libWeiboSDK.a(UIImage+WBSDKResize.o)
  "_kCGImageSourceCreateThumbnailWithTransform", referenced from:
      +[UIImage(WBSDKResize) wbsdk_resizeImageToMaxSize:sourcePath:] in libWeiboSDK.a(UIImage+WBSDKResize.o)
  "_kCGImageSourceCreateThumbnailFromImageAlways", referenced from:
      +[UIImage(WBSDKResize) wbsdk_resizeImageToMaxSize:sourcePath:] in libWeiboSDK.a(UIImage+WBSDKResize.o)
  "_kCGImagePropertyPixelHeight", referenced from:
      +[UIImage(WBSDKResize) wbsdk_imageSizeWithoutLoadingWithPath:] in libWeiboSDK.a(UIImage+WBSDKResize.o)
  "_kCGImagePropertyPixelWidth", referenced from:
      +[UIImage(WBSDKResize) wbsdk_imageSizeWithoutLoadingWithPath:] in libWeiboSDK.a(UIImage+WBSDKResize.o)
  "_CGImageSourceCopyPropertiesAtIndex", referenced from:
      +[UIImage(WBSDKResize) wbsdk_imageSizeWithoutLoadingWithPath:] in libWeiboSDK.a(UIImage+WBSDKResize.o)
  "_CGImageSourceCreateWithURL", referenced from:
      +[UIImage(WBSDKResize) wbsdk_resizeImageToMaxSize:sourcePath:] in libWeiboSDK.a(UIImage+WBSDKResize.o)
      +[UIImage(WBSDKResize) wbsdk_imageSizeWithoutLoadingWithPath:] in libWeiboSDK.a(UIImage+WBSDKResize.o)
  "_CGImageSourceCreateThumbnailAtIndex", referenced from:
      +[UIImage(WBSDKResize) wbsdk_resizeImageToMaxSize:sourcePath:] in libWeiboSDK.a(UIImage+WBSDKResize.o)
ld: symbol(s) not found for architecture armv7
clang: error: linker command failed with exit code  (use -v to see invocation)

SDK增加了图片处理功能，因此需要引入imageio这个框架

imageio.framework 包含在IOS SDK里，可以直接导入