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Using C in swift
Kaz Yoshikawa
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About me
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Kaz Yoshikawa
• Electricwoods LLC ද / Digital Lynx Systems Inc. ෭ද
• e-mail: [email protected]
• twitter: @codelynx1
• Working History
• Adobe Systems (Tokyo)
• Lionbridge (Tokyo)
• Quark (Tokyo / Denver)
• Hummingbird Communications (Mt. View, USA)
• Fact International (Vancouver, Canada)
• Perle Systems (Toronto, Canada), etc.
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Using C Library
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Using C in Swift
• SQLite
• OpenSSL
• zlib
• libxml2
• mysqllib
• libetpan
• commonCrypto
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Using C library in
your swift app
case: 'sqlite3'
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Create Bridging Header
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Adding Any ObjC Classes
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Create Bridging Header
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Bridging Header
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Don't forget adding
C libraries
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The code…
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Yah!!
!
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Using C Libraries in
your swift Framework
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There are some problems…
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Bridging Header
cannot be used
for Frameworks
"
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#
Then what should I do?
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Using Module Map
$
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What is module map?
Module maps
Module maps are specified as separate files (each named
module.modulemap) alongside the headers they
describe, which allows them to be added to existing
software libraries without having to change the library
headers themselves.
http://clang.llvm.org/docs/Modules.html#module-maps
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Creating a folder
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sqlite.h
build for both simulator and device
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Header Search Paths
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Import Paths
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Now you can use C
identifiers in swift code
JNQPSU6*,JU
JNQPSUTRMJUF
QVCMJDDMBTT5FTU4RMJUF@J04/40CKFDU\
QVCMJDDMBTTGVODUFTU
\
MFUGJMFQBUI /45FNQPSBSZ%JSFDUPSZ
BT/44USJOH
BQQFOEJOH1BUI$PNQPOFOU UFTUTRMJUF
WBSEC0QBRVF1PJOUFS OJM
MFUTUBUVTTRMJUF@PQFO@W GJMFQBUI
EC
42-*5&@01&/@3&"%83*5&]42-*5&@01&/@$3&"5&
OJM
TXJUDITUBUVT\
DBTF42-*5&@0,
QSJOU TRMJUFPQFO
MFUTUBUVTTRMJUF@DMPTF EC
TXJUDITUBUVT\
DBTF42-*5&@0,
QSJOU TRMJUFDMPTFE
EFGBVMU
QSJOU TRMJUFFSSPS= TUBUVT
^
EFGBVMU
QSJOU TRMJUFFSSPS= TUBUVT
^
^
^
make sure it's public
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Yes!!
%
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make sure
Header file in Framework
48*'5@$-"44 @5U$UFTU@TRMJUF@JPT@GSBNFXPSL5FTU4RMJUF@J04
!JOUFSGBDF5FTU4RMJUF@J04/40CKFDU
WPJE
UFTU
OPOOVMMJOTUBODFUZQF
JOJU0#+$@%&4*(/"5&%@*/*5*"-*;&3
!FOE
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Yes!!
&
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module.modulemap
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Clang
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module.modulemap
NPEVMFTRMJUF\
IFBEFSTRMJUFI
FYQPSU
^
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module-id
NPEVMFTRMJUF\
IFBEFSTRMJUFI
FYQPSU
^
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Attributes
NPEVMFTRMJUF\
IFBEFSTRMJUFI
FYQPSU
^
The system attribute specifies that the module is a system module. When a
system module is rebuilt, all of the module’s headers will be considered
system headers, which suppresses warnings. This is equivalent to placing
#pragma GCC system_header in each of the module’s headers.
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header
NPEVMFTRMJUF\
IFBEFSTRMJUFI
FYQPSU
^
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export
NPEVMFTRMJUF\
IFBEFSTRMJUFI
FYQPSU
^
Export declaration¶
An export-declaration specifies which imported modules will
automatically be re-exported as part of a given module’s API.
The export-declaration names a module or a set of modules that will
be re-exported to any translation unit that imports the enclosing
module. Each imported module that matches the wildcard-module-id
up to, but not including, the first * will be re-exported.
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module map issues
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Can't open declaration
cmd + click
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github: UsingCinSwift
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github: ZUnzip
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github: SqliteKit
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Yes!!
&
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C-callback
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C style callback
• CGPathApplierFunction()
• CGPatternCallbacks()
• CGPDFOperatorTableSetCallback()
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Oh well….
CGPath's C style callback
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may the force is with you
Stay tuned…..
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Wrap Up
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Wrap Up
• There are so many good libraries out there!
• Use Bridging Header, if you like to use C library in your
app
• Use module, if you like to use C library in your
framework