Travis CI报错：'...'不是后缀一元运算符，本地运行正常

Hey there, let's work through this frustrating issue—since your code runs fine locally but breaks on Travis CI, the problem almost certainly boils down to environment mismatches or dependency quirks. Let's break down the errors and fix them step by step:

1. Fix Xcode/Swift Version Mismatch #

The compilation errors you're seeing (like 'count' is unavailable and type conversion issues between Int/UInt variants and IntMax/UIntMax) are classic signs of a Swift version gap between your local machine and Travis CI. Travis often defaults to older Xcode versions unless explicitly told otherwise.

• Solution: Specify the exact Xcode version you're using locally in your .travis.yml file. For example, if you're on Xcode 10.1:

  osx_image: xcode10.1
  

  Double-check that the Swift version included with this Xcode release matches your local setup—this will resolve most of the syntax/type-related compile errors.

2. Refresh Pod Dependencies #

The errors pointing to ObjectMapper source files failing to compile suggest either a cached, outdated Pod version on Travis or a compatibility issue between ObjectMapper and the Swift version Travis is using.

• Solutions:
  • Clear Travis Cache: Go to your Travis project's settings page, find the "Cache" section, and clear the cached Pods directory. This forces Travis to fetch fresh dependencies on the next build.
  • Lock ObjectMapper to a Compatible Version: Update your Podfile to specify an ObjectMapper version that works with your Swift version. For example, if you're using Swift 4.2, use:

    pod 'ObjectMapper', '~> 3.5.0'
    

  • Force a Clean Pod Install: Modify your Travis build script to run:

    pod deintegrate && pod install
    

    before your xcodebuild command to ensure a fresh, clean set of Pods.

3. Resolve the shell_session_update: command not found Error #

This error stems from an outdated shell environment on Travis's macOS instances. Fix it by explicitly setting the shell to bash in your .travis.yml:

before_install:
  - export SHELL=/bin/bash

4. Fix Test Operation Cancellation #

The "Test operation was canceled" error might be caused by an invalid simulator destination configuration. The iPhone SE name or OS version might not exist in the Xcode version Travis is using.

• Solution: Update your xcodebuild command's destination to use a compatible simulator. For example:

  xcodebuild -workspace CF\ Apps.xcworkspace -scheme CF\ Apps -sdk iphonesimulator -destination 'platform=iOS Simulator,OS=12.1,name=iPhone SE' build-for-testing test
  

  If you're unsure of valid simulator names/OS versions for your specified Xcode, you can add a pre-build command to list available simulators:

  xcrun simctl list devices
  

Start with the Xcode version fix first—it's the most likely culprit here. Once that's sorted, the other issues should fall into place.

内容的提问来源于stack exchange，提问作者Dwayne Forde