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 1 (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
新浪微博iOS SDK UIImage+WBSDKResize.o
原文：http://www.cnblogs.com/sdlwlxf/p/4347829.html