iOS 库嵌套的调用问题
我把 SDWebImage.framework 加入到我创建的 Cocoa Touch Framework 工程 XXCommonFramework里面，我在调用的应用工程里面加入XXCommonFramework，然后访问 SDWebImage.framework 的方法，结果报错，麻烦有知道怎么解决的指点下，万分感谢。
报错如下： ld: warning: embedded dylibs/frameworks only run on iOS 8 or later
Undefined symbols for architecture armv7:
"_kCGImagePropertyGIFDictionary", referenced from:
+[UIImage(GIF) sd_animatedGIFWithData:] in SDWebImage(UIImage+GIF.o)
"_CGImageSourceCreateWithData", referenced from:
+[UIImage(GIF) sd_animatedGIFWithData:] in SDWebImage(UIImage+GIF.o)
"_CGImageSourceCreateIncremental", referenced from:
-[SDWebImageDownloaderOperation connection:didReceiveData:] in
SDWebImage(SDWebImageDownloaderOperation.o)
"_kCGImagePropertyGIFDelayTime", referenced from:
+[UIImage(GIF) sd_animatedGIFWithData:] in SDWebImage(UIImage+GIF.o)
"_CGImageSourceGetCount", referenced from:
+[UIImage(GIF) sd_animatedGIFWithData:] in SDWebImage(UIImage+GIF.o)
"_CGImageSourceUpdateData", referenced from:
-[SDWebImageDownloaderOperation connection:didReceiveData:] in
SDWebImage(SDWebImageDownloaderOperation.o)
"_CGImageSourceCreateImageAtIndex", referenced from:
-[SDWebImageDownloaderOperation connection:didReceiveData:] in SDWebImage(SDWebImageDownloaderOperation.o)
+[UIImage(GIF) sd_animatedGIFWithData:] in SDWebImage(UIImage+GIF.o)
"_CGImageSourceCopyPropertiesAtIndex", referenced from:
-[SDWebImageDownloaderOperation connection:didReceiveData:] in SDWebImage(SDWebImageDownloaderOperation.o)
+[UIImage(GIF) sd_animatedGIFWithData:] in SDWebImage(UIImage+GIF.o)
"_kCGImagePropertyPixelWidth", referenced from:
-[SDWebImageDownloaderOperation connection:didReceiveData:] in SDWebImage(SDWebImageDownloaderOperation.o)
"_kCGImagePropertyPixelHeight", referenced from:
-[SDWebImageDownloaderOperation connection:didReceiveData:] in SDWebImage(SDWebImageDownloaderOperation.o)
