NSObject-ExchangeImp

Exchange implementations of 2 methods

Usage

1. Add a category of the class you want to exchange implementation, and implement your methods
2. call + (BOOL)exchangeMethod:(SEL)orgSelector withMethod:(SEL)newSelector to exchange the implementation of the original method and your method
3. if you need to call the original methods, call your new method instead. (as it have been exchanged)

Example

Test code:

- (void)test
{
	NSLog(@"UDID before exchange: %@", [[UIDevice currentDevice] uniqueIdentifier]);
	[UIDevice exchangeMethod:@selector(uniqueIdentifier) withMethod:@selector(fakeUniqueIdentifier)];
	NSLog(@"UDID after exchange: %@", [[UIDevice currentDevice] uniqueIdentifier]);
}

The category containing the method to exchange:

@implementation UIDevice (FakeUDID)

- (NSString *)fakeUniqueIdentifier
{
	return @"0000000000000000000000000000000000000000";
}

@end