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AnonymusDelegate

A experimental way of implement a delegate with blocks. This allows to build thinks like this:

UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Test" message:@"Mensage de test" delegate:nil cancelButtonTitle:@"Cancel" otherButtonTitles:@"Ok", nil];

alert.delegate = dynProtocol(@selector(alertView:clickedButtonAtIndex:), ^(SEL c, UIAlertView *v, NSInteger i) {
	NSLog(@"Success. alert %@ - i = %d", v, i);
}, @selector(willPresentAlertView:), ^(SEL c, UIAlertView *v) {
	NSLog(@"Will present alert. alert = %@", v);
}, @selector(didPresentAlertView:), ^(SEL c, UIAlertView *v) {
	NSLog(@"Did present alert. alert = %@", v);
}, NULL);

[alert show];

The code is mostly pure C but is really simple.

How it works

The magic starts in the call to the macro 'dynProtocol'. Basically, it's iterates over the protocols that 'self' implementas looking for a definition for the selectors passed as parameters. Once one definition is find it try to add the method for that selector to '[self class]' setting the body of the method to be the block passed also as parameter.