使用到一个命令：lipo
生成兼容文件
lipo -create '真机库文件' '模拟器库文件' -output '生成的文件'
lipo -info //查看库文件信息
真机： Architectures in the fat file: xxx.framework/xxx are: armv7 arm64
模拟器：Architectures in the fat file: xxx.framework/xxx are: i386 x86_64
为了更直观地描述这一过程，下面以IJKPlayer项目生成framework库为例：
打开IJKMediaDemo.xcodeproj
edit scheme -> Build configuration 选择 Release -> Close
scheme选择IJKmediaFramework ，运行设备选择真机或Generic iOS Device
Command + B
编译成功后，切换运行设备选择任一模拟器
Command + B
待编译成功后找到Products->IJKmediaFramework.framework文件，右键 -> Show in Finder，查看上一级目录如下：
- Release-iphoneos
- Release-iphonesimulator
这当中便是刚才生成的库文件了，紧接着祭出终端，输入命令
lipo -create ~/Library/Developer/Xcode/DerivedData/IJKMediaDemo-xxx/Build/Products/Release-iphonesimulator/IJKMediaFramework.framework/IJKMediaFramework ~/Library/Developer/Xcode/DerivedData/IJKMediaDemo-xxx/Build/Products/Release-iphoneos/IJKMediaFramework.framework/IJKMediaFramework -output ~/Desktop/IJKMediaFramework
若一切顺利，此时桌面会生成IJKMediaFramework文件
lipo -info ~/Desktop/IJKMediaFramework
看到如下输出则表明大功告成，库文件可同时支持多种cpu架构i386 armv7 x86_64 arm64
Architectures in the fat file: ~/Desktop/IJKMediaFramework are: i386 armv7 x86_64 arm64
