Xcode相关平台及SDK路径

通过终端操作：

1，平台 /Applications/Xcode.app/Contents/Developer/Platforms

MacOSX.platform iPhoneSimulator.platform

iPhoneOS.platform

2，iOS设备 /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs

iPhoneOS.sdk iPhoneOS8.0.sdk

3，iOS模拟器 /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs

iPhoneSimulator.sdk iPhoneSimulator7.0.sdk iPhoneSimulator8.0.sdk

在升级xcode之前需要将旧的sdk拷贝出来，否则会被覆盖掉，升级完成后再拷贝回去即可。