Category: iphone

In Objective-C, a selector’s signature consists of:

1. The name of the method (in this case it would be ‘myTest’) (required)
2. A ‘;’ (colon) following the method name if the method has an input.
3. A name and ‘:’ for every additional input.

Selectors have no knowledge of:

1. The input types
2. The method’s return type.

Here’s a class implementation where performMethodsViaSelectors method performs the other class methods by way of selectors:

@implementation ClassForSelectors

- (void) fooNoInputs {
  NSLog(@"Does nothing");
}

- (void) fooOneIput:(NSString*) first {
  NSLog(@"Logs %@", first);
}

- (void) fooFirstInput:(NSString*) first secondInput:(NSString*) second {
  NSLog(@"Logs %@ then %@", first, second);
}

- (void) performMethodsViaSelectors {
  [self performSelector:@selector(fooNoInputs)];
  [self performSelector:@selector(fooOneInput:) withObject:@"first"];
  [self performSelector:@selector(fooFirstInput:secondInput:) withObject:@"first" withObject:@"second"];
}

@end

The method you want to create a selector for has a single input, so you would create a selector for it like so:

SEL myTestSelector = @selector(myTest:);

via Objective-C: Calling selectors with multiple arguments – Stack Overflow.