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    <p><strong>UPDATE</strong>: (My App uses this method and is in the appstore)</p> <p>Method swizzling seems to be working as of May 30, 2012. this is my implementation.</p> <p>(This is for those of you looking around and finding bad code on wiki pages and just want a quick implementation.)</p> <p>Swizz.h</p> <pre><code>#import &lt;Foundation/Foundation.h&gt; void ActivateAutoSwizz(); void Swizz(Class c, SEL orig, SEL replace); @interface NSObject (swizz) // This Method allows the class to Swizzle more methods within itself. // And allows for an overridable init method in Class Extensions // ###################### // //// To Swizzle a method, call Swizzle once on the class in question. // //// dispatch_once is a good way to handle that. // static dispatch_once_t onceToken; // dispatch_once(&amp;onceToken, ^{ // Swizz([UITableViewCell class], @selector(reuseIdentifier), @selector(classReuseIdentifier)); // }); - (void) swizzInit; @end </code></pre> <p>Swizz.m</p> <pre><code>#import "Swizz.h" #import &lt;objc/runtime.h&gt; #import &lt;objc/message.h&gt; //.... void Swizz(Class c, SEL orig, SEL replace) { Method origMethod = class_getInstanceMethod(c, orig); Method newMethod = class_getInstanceMethod(c, replace); if(class_addMethod(c, orig, method_getImplementation(newMethod), method_getTypeEncoding(newMethod))) class_replaceMethod(c, replace, method_getImplementation(origMethod), method_getTypeEncoding(origMethod)); else method_exchangeImplementations(origMethod, newMethod); } @implementation NSObject (swizz) // Load gets called on every object that has it. Off Thread, before application start. + (void) load { static dispatch_once_t onceToken; dispatch_once(&amp;onceToken, ^{ Swizz([NSObject class], @selector(init), @selector(initIntercept)); }); } - (id) initIntercept{ self = [self initIntercept]; // Calls the Original init method if(self){ [self swizzInit]; } return self; } - (void) swizzInit{ //Do Nothing.. Gives an extension point for other classes. } @end </code></pre> <p>I built this to allow me to intercept the reuseIdentifier on the UITableViewCell with a UITableViewCell extension.</p> <p>Here is that example.</p> <p>UITableViewCell+ReuseIdentifier.h</p> <pre><code>#import &lt;UIKit/UIKit.h&gt; #import &lt;Foundation/Foundation.h&gt; @interface UITableViewCell (ReuseIdentifier) @end </code></pre> <p>UITableViewCell+ReuseIdentifier.m</p> <pre><code>#import "UITableViewCell+ReuseIdentifier.h" #import "Swizz.h" @implementation UITableViewCell(ReuseIdentifier) // Edited to remove Class variable. // Class variables in Categories are Global. // And as it turns out, this method did not need the variable anyhow. - (NSString *)classReuseIdentifier{ NSString *reuseIdentifierResult = [self classReuseIdentifier]; // Gets the original reuseIdentifier if (reuseIdentifierResult == nil){ reuseIdentifierResult = [[self class] description]; } return reuseIdentifierResult; } // Alternatively you can use the +(void)load method on the class to achieve the same thing. - (void)swizzInit{ static dispatch_once_t onceToken; dispatch_once(&amp;onceToken, ^{ Swizz([UITableViewCell class], @selector(reuseIdentifier), @selector(classReuseIdentifier)); }); } @end </code></pre> <p>As you can see, the ActivateAutoSwizz() as well as my swizzInit method both use dispatch_once to execute the swizzle once.</p> <pre><code>static dispatch_once_t onceToken; dispatch_once(&amp;onceToken, ^{ Swizz([NSObject class], @selector(init), @selector(initIntercept)); }); </code></pre> <p>If you execute it twice. it reverses your method switch back to original. I hope this helps some of you iOS devs out there.</p> <p><strong>NOTE: I have determined that +(void) load is called once at app start and is a wonderful place to achieve the method swizzle. Unfortunately in some dev situations +(void)load is not called, You may want to test your app to make sure these methods are being called.</strong></p>
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