JRSwizzle
Description
JRSwizzle is source code package that offers a single, easy, correct+consistent interface for exchanging Objective-C method implementations ("method swizzling") across many versions of Mac OS X, iOS, Objective-C and runtime architectures.
More succinctly: JRSwizzle wants to be your one-stop-shop for all your method swizzling needs.
Download
$ cd /path/to/top/of/your/project
$ git submodule add git://github.com/rentzsch/jrswizzle.git JRSwizzle semver-1.x
$ git submodule init && git submodule update
# OPTIONAL: Execute the following commands if you want to explicitly peg
# to a certain version. Otherwise `git submodule update` will keep you
# current with HEAD.
$ cd JRSwizzle
$ git checkout v1.1.0
Reasons for Existence
- Easy: Just do this:
[SomeClass jr_swizzle:@selector(foo) withMethod:@selector(my_foo) error:&error];Voila. - Correct: There's a subtle interaction between method swizzling and method inheritance. Following in Kevin Ballard's footsteps, this package Does The Right Thing.
- Compatible: JRSwizzle should Just Work on any version of Mac OS X and iOS you care about. Here's the exhaustive compatibility list:
- Mac OS X v10.3/ppc (Ballard implementation)
- Mac OS X v10.4/ppc (Ballard implementation)
- Mac OS X v10.4/i386 (Ballard implementation)
- Mac OS X v10.5/ppc (method_exchangeImplementations+Ballard implementation)
- Mac OS X v10.5/i386 (method_exchangeImplementations+Ballard implementation)
- Mac OS X v10.5/ppc64 (method_exchangeImplementations+Ballard implementation)
- Mac OS X v10.5/x86_64 (method_exchangeImplementations+Ballard implementation)
- iOS 2.0+ (method_exchangeImplementations+Ballard implementation)
- Robust: All parameters are checked and JRSwizzle returns an optional
NSErrorwith high-quality diagnostics.
Support
Please use JRSwizzle's GitHub Issues tab to file bugs or feature requests.
To contribute, please fork this project, make+commit your changes and then send me a pull request.
Comparison
There's at least four swizzling implementations floating around. Here's a comparison chart to help you make sense of how they relate to each other and why JRSwizzle exists.
- Classic is the canonical
MethodSwizzle()implementation as described in CocoaDev's MethodSwizzling page. - Ballard is Kevin Ballard's improved implementation which solves the inherited method problem.
- Apple is 10.5's new
method_exchangeImplementationsAPI. - JRSwizzle is this package.
License
The source code is distributed under the nonviral MIT License. It's the simplest most permissive license available.
Version History
-
v1.1.0: Nov 28 2016
- [NEW] Block-based swizzle api. Note it uses
NSInvocationwhich is known to be not the fastest of APIs. (dhcdht)
- [NEW] Block-based swizzle api. Note it uses
-
v1.0: Mar 2 2012
-
[NEW] iOS Support. (Anton Serebryakov)
-
[NEW] Class method swizzling. (outis)
-
-
v1.0d1: May 31 2009
-
[FIX] Soothe valgrind by nulling out
hoisted_method_list->obsolete, which it apparently reads. (Daniel Jalkut) -
[FIX] Xcode 3.2 apparently now needs
ARCHSset explicitly for 10.3 targets. (rentzsch)
-
-
v1.0d0: Apr 09 2009
- Moved to github.
-
v1.0d0: Dec 28 2007
- Under development.