How to use CommonCrypto in iOS

Issue #480

Use modulemap

modulemap approach

I use modulemap in my wrapper around CommonCrypto https://github.com/onmyway133/arcane, https://github.com/onmyway133/Reindeer

For those getting header not found, please take a look https://github.com/onmyway133/Arcane/issues/4 or run xcode-select --install

• Make a folder CCommonCrypto containing module.modulemap

module CCommonCrypto {
  header "/usr/include/CommonCrypto/CommonCrypto.h"
  export *
}

• Go to Built Settings -> Import Paths

${SRCROOT}/Sources/CCommonCrypto

Cocoapods with modulemap approach

• Here is the podspec https://github.com/onmyway133/Arcane/blob/master/Arcane.podspec

  s.source_files = 'Sources/**/*.swift'
  s.xcconfig = { 'SWIFT_INCLUDE_PATHS' =>
  '$(PODS_ROOT)/CommonCryptoSwift/Sources/CCommonCrypto' }
  s.preserve_paths = 'Sources/CCommonCrypto/module.modulemap'

• Using module_map does not work, see https://github.com/CocoaPods/CocoaPods/issues/5271

• Using Local Development Pod with path does not work, see https://github.com/CocoaPods/CocoaPods/issues/809

• That’s why you see that my Example Podfile https://github.com/onmyway133/CommonCrypto.swift/blob/master/Example/CommonCryptoSwiftDemo/Podfile points to the git repo

  target 'CommonCryptoSwiftDemo' do
    pod 'CommonCryptoSwift', :git => 'https://github.com/onmyway133/CommonCrypto.swift'
  end

public header approach

• Ji is a wrapper around libxml2, and it uses public header approach

• It has a header file https://github.com/honghaoz/Ji/blob/master/Source/Ji.h with Target Membership set to Public

• It has a list of header files for libxml2 https://github.com/honghaoz/Ji/tree/master/Source/Ji-libxml

• It has Build Settings -> Header Search Paths

  $(SDKROOT)/usr/include/libxml2

• It has Build Settings -> Other Linker Flags

  -lxml2

Cocoapods with public header approach

• Take a look at the podspec https://github.com/honghaoz/Ji/blob/master/Ji.podspec

s.libraries        = "xml2"
s.xcconfig         = { 'HEADER_SEARCH_PATHS' =>           '$(SDKROOT)/usr/include/libxml2', 'OTHER_LDFLAGS' => '-lxml2' }

🐝 Interesting related posts

• https://stackoverflow.com/questions/24004732/how-to-call-c-from-swift
• https://spin.atomicobject.com/2015/02/23/c-libraries-swift/

CommonCrypto from Xcode 10

From Xcode 10, we can just

import CommonCrypto

Code

• https://github.com/onmyway133/Arcane
• https://stackoverflow.com/questions/25248598/importing-commoncrypto-in-a-swift-framework/37125785#37125785