在添加了nfnetworking之后运行报错：
dyld: Library not loaded: @rpath/AFNetworking.framework/AFNetworking
Referenced from: /Users/Library/Developer/CoreSimulator/Devices/078F3A86-9ACA-4920-A875-6EA6D15745A4/data/Containers/Bundle/Application/1A738A3A-E12F-4BC4-A2D4-260BEA9CEE66/CommonProject.app/CommonProject
Reason: image not found
解决方案：
将AFNetworking.framework的状态由require改为optional,然后clean，就可以正常运行了
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