iOS 在 cocoapods 上发布私有代码框架

我需要在 cocoapods 上发布一个 MySDK.framework（混合 obj-c + Swift）。我按照使用 CocoaPods 在 Swift中发布通用二进制 iOS 框架中的步骤进行操作

当我运行时pod install，它说：

Analyzing dependencies
Fetching podspec for `MySDK` from `..`
Downloading dependencies
Using AFNetworking (3.1.0)
Using Crashlytics (3.9.3)
Using FXBlurView (1.6.4)
Using Fabric (1.7.2)
Using HexColors (2.3.0)
Using JSONModel (1.7.0)
Using KVOController (1.2.0)
Using Masonry (1.0.2)
Using SAMKeychain (1.5.3)
Using SDWebImage (3.8.2)
Using SnapKit (3.0.2)
Using SwiftyBeaver (1.2.2)
Using Toast (3.1.0)
Using YYImage (1.0.4)
Using MySDK (0.0.1)
Generating Pods project
Integrating client project
Sending stats
Pod installation complete! There is 1 dependency from the Podfile and 15 total pods installed.

但是MySDK.zip没有下载也没有安装在 Pods 项目中，所以 Xcode 抱怨缺少模块 MySDK（在导入 MySDK 时）。

我的SDK.podspec

#
# Be sure to run `pod lib lint MySDK.podspec' to ensure this is a
# valid spec before submitting.
#
# Any lines starting with a # are optional, but their use is encouraged
# To learn more about a Podspec see http://guides.cocoapods.org/syntax/podspec.html
#

Pod::Spec.new do |s|
  s.name             = 'MySDK'
  s.version          = '0.0.1'
  s.summary          = 'A short description of MySDK.'

# This description is used to generate tags and improve search results.
#   * Think: What does it do? Why did you write it? What is the focus?
#   * Try to keep it short, snappy and to the point.
#   * Write the description between the DESC delimiters below.
#   * Finally, don't worry about the indent, CocoaPods strips it!

  s.description      = <<-DESC
                   MySDK framework for iOS.

                   * TODO: where docs are?
                   DESC

  s.homepage         = 'http://www.MySDK.com'
  # s.screenshots     = 'www.example.com/screenshots_1', 'www.example.com/screenshots_2'
  s.license          = { :type => 'Apache 2', :file => 'LICENSE' }
  s.author           = { 'me' => '[email protected]' }

  s.ios.deployment_target = '8.0'
  s.source            = { :http => 'http://working-link.to/MySDK.framework.zip' }
  s.ios.vendored_frameworks = 'MySDK.framework'

  s.frameworks = 'UIKit'

  s.dependency 'AFNetworking', '~> 3.1.0'
  s.dependency 'Crashlytics', '~> 3.9.3'
  s.dependency 'Fabric', '~> 1.7.2'
  s.dependency 'JSONModel', '~> 1.7.0'
  s.dependency 'KVOController', '~> 1.2.0'
  s.dependency 'Masonry', '~> 1.0.2'
  s.dependency 'SAMKeychain', '~> 1.5.3'
  s.dependency 'SDWebImage', '~> 3.8.2'
  s.dependency 'SnapKit', '~> 3.0.0'
  s.dependency 'SwiftyBeaver', '~> 1.2.2'
  s.dependency 'Toast', '~> 3.1.0'
  s.dependency 'YYImage', '~> 1.0.4'

end

• 如果我将框架添加到嵌入框架中，一切都会按预期工作。

• 尝试干净的 Pods 缓存，没有运气

请帮忙！