1. sdk与xcode对应关系
   iOS SDK

2. 下载对应的xcode
   下载地址

3. 双击dmg文件，系统自动挂载到/Volumes
   Xcode7.0.1.dmg对应ios sdk 9.0

拷贝sdk
sudo cp -a /Volumes/Xcode/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS.sdk/ /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS9.0.sdk/
拷贝模拟器
sudo cp -a /Volumes/Xcode/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator.sdk/ /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator9.0.sdk

4. 重启Xcode

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