I am trying to learn the concept of swizzling.
Even though I have added method_exchangeImplementations
, still the methods are not being swizzled. Any idea as to where I am going wrong?
#import <objc/runtime.h>
@interface POCViewController ()
- (void)addSwizzle;
- (void)originalMethod;
- (void)swizzledMethod;
@end
@implementation POCViewController
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
//Add swizzle
[self addSwizzle];
//Call the original method
[self originalMethod];
}
- (void)addSwizzle
{
Method original, swizz;
original = class_getClassMethod([self class], @selector(originalMethod));
swizz = class_getClassMethod([self class], @selector(swizzledMethod));
method_exchangeImplementations(original, swizz);
}
- (void)originalMethod
{
NSLog(@"Inside original method");
}
- (void)swizzledMethod
{
NSLog(@"Inside swizzled method");
[self swizzledMethod];
}
You are using class_getClassMethod
to get implementations of instance methods, you should use class_getInstanceMethod
instead.
method_exchangeImplementations
is still used the same way