xcode9支持ios12真机调试

1.复制“SDKSettings.plist”到“/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS.sdk”路径下，替换原来的文件2.解压并复制"12.0(16A5288q)"文件甲中所有文件到“/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/DeviceSupport”路径下3.重启xcode，一切OK。