Cocoapods对 Swift 的支持不是很好，每次 Xcode 或 Cocoapods 版本更新，总有一些意外发生，这里总结下这一年半以来遇到的各种错误及其解决办法，省的下次遇到又要Google一遍。
安装淘宝 Ruby源的问题 Error fetching http://ruby.taobao.org/
由于墙的原因，安装 Cocoapods 时有可能执行完install命令半天都没反应，这时就需要将 Ruby 的默认源 https://rubygems.org/ 替换成淘宝的源，但会遇到以下错误：
$ gem sources -a http://ruby.taobao.org/
$ Error fetching http://ruby.taobao.org/:
bad response Not Found 404 (http://ruby.taobao.org/specs.4.8.gz)
这是因为，淘宝把源从 http 换成 https 了，而网上大多数教程是旧的，没有更新，正确的是：
$ gem sources -a https://ruby.taobao.org/
Pod Error in Xcode “Id: framework not found Pods”
执行完 pod install 后，打开 workspace 文件，编译，遇到以下错误：
Id: framework not found Pods clang: error: linker command failed with exit code 1 (use -v to see invocation)
stackoverflow解决方法的：http://stackoverflow.com/questions/31139534/pod-error-in-xcode-id-framework-not-found-pods
步骤如下：
- 打开 workspace
- 点击 Xcode 左边的蓝色项目图标
- 在右边选择对应的 Target
- 单击 Genral 的 tab
- 找到 Linked Frameworks and Libraries 的分组
- 删除 Pods frameworks（或 删除Embedded Binaries下的Pod.framework）
- 关闭 Xcode，运行 pod update，
- Clean，然后重新 Run/Build
提交App到Itunes Connect时报错 ERROR ITMS-90635
提交 App 到 ITunes Connect 审核时报以下错误：
ERROR ITMS-90635: "Invalid Mach-O Format. The Mach-O in bundle "XXXX!.app/Frameworks/BRYXBanner.framework" isn’t consistent with the Mach-O in the main bundle. The main bundle Mach-O contains armv7(machine code) and arm64(machine code), while the nested bundle Mach-O contains armv7(bitcode) and arm64(bitcode). Verify that all of the targets for a platform have a consistent value for the ENABLE_BITCODE build setting."
WARNING ITMS-90080: "The executable 'Payload/XXXX!.app/Frameworks/Bolts.framework' is not a Position Independent Executable. Please ensure that your build settings are configured to create PIE executables. For more information refer to Technical Q&A QA1788 - Building a Position Independent Executable in the iOS Developer Library."
stackoverflow 解决方法：http://stackoverflow.com/questions/37634627/upload-to-itunesconnect-failing
这是因为 Xcode 7 (或以上）默认支持 bitcode，而你的项目关闭了bitcode（即在 【Build Settings】 中设置了 【Enable Bitcode】为 NO），需要在 Podfile中进行额外配置：
post_install do |installer|
installer.pods_project.targets.each do |target|
target.build_configurations.each do |config|
config.build_settings['ENABLE_BITCODE'] = 'NO'
end
end
end
升级Xcode8后报错“target overrides the EMBEDDED_CONTENT_CONTAINS_SWIFTbuild setting”
升级 Xcode 8后，运行 Pod install， 报以下错误：
[!] The X target overrides the `EMBEDDED_CONTENT_CONTAINS_SWIFT` build setting defined in `X’. This can lead to problems with the CocoaPods installation
- Use the `$(inherited)` flag, or
- Remove the build settings from the target.
[!] The `X` target overrides the `ALWAYS_EMBED_SWIFT_STANDARD_LIBRARIES` build setting defined in `X'. This can lead to problems with the CocoaPods installation
- Use the `$(inherited)` flag, or
- Remove the build settings from the target.
stackoverflow 解决方法：http://stackoverflow.com/questions/39569743/errors-after-updating-to-xcode-8-no-such-module-and-target-overrides-the-em
步骤如下：
- 找到 【Project/Targets】-->【Project Name】-->【Build Settings】
- 搜索 "ALWAYS_EMBED_SWIFT_STANDARD_LIBRARIES"
- 右键 "debug"，选择 "other"，输入 $(inherited)
- "release" 也做同样的操作，然后重新 "pod install"
如下图：
指定编译版本
指定Target的 Swift 编译版本为 3.0
post_install do |installer|
installer.pods_project.targets.each do |target|
target.build_configurations.each do |configuration|
configuration.build_settings['SWIFT_VERSION'] = "3.0"
end
end
end
但如果是 Objective-C 跟 Swift 混编的项目, 想要引入 OC 的第三方库的话, 还需要添加另一项参数
configuration.build_settings['ALWAYS_EMBED_SWIFT_STANDARD_LIBRARIES'] = 'NO'
