@selector - With Multiple Arguments?

Question

I have been using @selector today for the first time and have not been able to work out how to do the following? How would you write the @selector

Answer 1

Using NSInvocation as you specify you can create an NSObject category that implements

- (void)performSelector:(SEL)aSelector withObjects:(NSArray *)arguments;

Something like:

- (void)performSelector:(SEL)aSelector withObjects:(NSArray *)arguments
{
    NSMethodSignature *signature = [self methodSignatureForSelector: aSelector];
    NSInvocation *invocation = [NSInvocation invocationWithMethodSignature: signature];
    [invocation setSelector: aSelector];

    int index = 2; //
    for (NSObject *argument in arguments) {
        [invocation setArgument: &argument atIndex: index];
        index ++;
    }
    [invocation invokeWithTarget: self];
}

from: iOS - How to implement a performSelector with multiple arguments and with afterDelay?

Answer 2

Another option is to use an even shorter syntax:

#import <objc/message.h> // objc_msgSend
...
((void (*)(id, SEL, Type1, Type2, Type3))objc_msgSend)(target, a_selector, obj1, obj_of_type2, obj_of_type3);

Answer 3

@selector(printText:andMore:)