在终端键入如下命令：
lipo -create /Users/kangyufeng/Downloads/BaiduMap_IOSSDK_v2.4.1_All/BaiduMap_IOSSDK_v2.4.1_Lib/Release-iphoneos/libbaidumapapi.a /Users/kangyufeng/Downloads/BaiduMap_IOSSDK_v2.4.1_All/BaiduMap_IOSSDK_v2.4.1_Lib/Release-iphonesimulator/libbaidumapapi.a -output /Users/kangyufeng/Downloads/libbaidumapapi.a
三个路径分别为：真机.a文件、模拟器.a文件、合并后.a文件的存放路径