类似这样的错误：
fatal error: file '/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator8.1.sdk/System/Library/Frameworks/UIKit.framework/Headers/UITableView.h' has been modified since the precompiled header '/Users/weixuewu/Library/Developer/Xcode/DerivedData/JiaoWuXiTong-grltjakjujuowvcvrkqlqrwpbqfr/Build/Intermediates/PrecompiledHeaders/Pods-AFNetworking-prefix-esbdmbdlgmazudenvxmluxydclkd/Pods-AFNetworking-prefix.pch.pch' was built fatal error: file '/Applications
