在本身已有：
Version 9.1 beta (9B37)
的情况下，下载了最新的
Xcode 9.2 beta
版后去编译项目，结果出错：
Module compiled with Swift 4.0 cannot be imported in Swift 3.2.3: …/Carthage/Build/iOS/Cartography.framework/Modules/Cartography.swiftmodule/x86_64.swiftmodule
很明显，又是库的版本需要重新编译
那么去参考之前的
【已解决】Xcode9中项目编译出错：Module compiled with Swift 3.1 cannot be imported in Swift 3.2.1
再去试试：
➜ SRT git:(master) ✗ rm -rf ~/Library/Caches/org.carthage.CarthageKit/DerivedData
➜ SRT git:(master) ✗ carthage update –platform iOS –no-use-binaries
Please update to the latest Carthage version: 0.26.2. You currently are on 0.24.0
*** Cloning Cartography
所以先去升级carthage：
【已解决】brew upgrade carthage出错：Error carthage 0.25.0 already installed
然后再去：
carthage update –platform iOS –no-use-binaries
不过突然想到，或许最后也是不行，或许是会由于两个Xcode的版本同存，导致当前的swift的编译器还是3.2.3的？
这个是之前的9.1的Xcode
这个是9.2 beta：
所以还是要等最后看看结果如何。
然后编译等待了1个小时左右，才编译到Realm，还是没有编译完毕，而且CPU始终是100%，电脑卡死。所以干脆中断：
重新开始试试。
最终经历了：大概2个小时，才完整的更新一遍：
➜ SRT git:(master) ✗ carthage update –platform iOS –no-use-binaries
*** Fetching Cartography
*** Fetching MGSwipeTableCell
*** Fetching Alamofire
*** Fetching TextFieldEffects
*** Fetching SwiftyJSON
*** Fetching KMPlaceholderTextView
*** Fetching realm-cocoa
*** Fetching SwiftHEXColors
*** Fetching SwiftHTTPStatusCodes
*** Fetching ActionSheetPicker-3.0
*** Fetching Kingfisher
*** Fetching Charts
*** Fetching SwiftKeychainWrapper
*** Fetching DLRadioButton
*** Fetching XCGLogger
*** Checking out Cartography at “1.1.0”
*** Checking out DLRadioButton at “1.4.11”
*** Checking out Charts at “v3.0.4”
*** Checking out SwiftKeychainWrapper at “2.2.1”
*** Checking out Kingfisher at “3.13.1”
*** Checking out ActionSheetPicker-3.0 at “2.2.0”
*** Checking out SwiftHTTPStatusCodes at “3.1.2”
*** Checking out SwiftHEXColors at “1.1.1”
*** Checking out realm-cocoa at “v3.0.2”
*** Checking out KMPlaceholderTextView at “1.3.0”
*** Checking out SwiftyJSON at “4.0.0”
*** Checking out TextFieldEffects at “1.4.0”
*** Checking out Alamofire at “4.5.1”
*** Checking out MGSwipeTableCell at “1.6.6”
*** Checking out XCGLogger at “Version_4.0.0”
*** xcodebuild output can be found in /var/folders/46/2hjxz38n22n3ypp_5f6_p__00000gn/T/carthage-xcodebuild.Zg0Tdb.log
*** Building scheme “CoreActionSheetPicker” in ActionSheetPicker-3.0.xcworkspace
*** Building scheme “Alamofire iOS” in Alamofire.xcworkspace
*** Building scheme “Cartography-iOS” in Cartography.xcworkspace
*** Building scheme “Charts” in Charts.xcodeproj
*** Building scheme “DLRadioButton” in DLRadioButton.xcodeproj
*** Building scheme “Kingfisher” in Kingfisher.xcworkspace
*** Building scheme “KMPlaceholderTextView” in KMPlaceholderTextView.xcodeproj
*** Building scheme “MGSwipeTableCell” in MGSwipeTableCell.xcodeproj
*** Building scheme “Realm” in Realm.xcworkspace
*** Building scheme “RealmSwift” in Realm.xcworkspace
*** Building scheme “SwiftHEXColors” in SwiftHEXColors.xcodeproj
*** Building scheme “HTTPStatusCodes” in HTTPStatusCodes.xcodeproj
*** Building scheme “SwiftKeychainWrapper” in SwiftKeychainWrapper.xcodeproj
*** Building scheme “SwiftyJSON iOS” in SwiftyJSON.xcworkspace
*** Building scheme “TextFieldEffects” in TextFieldEffects.xcodeproj
*** Building scheme “XCGLogger (iOS)” in XCGLogger.xcodeproj
➜ SRT git:(master) ✗
然后就再去试试新版的Xcode 9.2中是否可以正常编译
结果还是不行。
TODO：
后续再去想办法看看，Xcode 9.2中如何指定编译器为swift 3.2
目前简单去看了看Xcode 9.2中的配置中，是找不到相关的编译器指定为swift 3.2.3的
并且，项目配置中，本身已经选择了Swift的编译器版本是3.2.3，而不是4.0.1的，
但是不知道为何Xcode 9.2编译时，却内部还是默认用Swift 4去编译？
转载请注明：在路上 » 【未解决】Xcode换9.2后代码编译报错：Module compiled with Swift 4.0 cannot be imported in Swift 3.2.3