CODEWITHSUNDEEP
objective-cselectorperformselector
user392412
user392412

Reputation: 743

Use performSelector with three or more arguments?

The various performSelector:... methods can handle a maximum of two arguments passed to the specified selector. What can I do if I need to pass three or more arguments?

Upvotes: 15

Views: 4217

Answers (2)

BB9z
BB9z

Reputation: 2720

I dislike the NSInvocation way, it needs too much code.

If you’d like perform the selector immediately, here is an simple and clean way:

// Assume we have these variables
id target, SEL aSelector, id parameter1, id parameter2;

// Get the method IMP, method is a function pointer here.
id (*method)(id, SEL, id, id) = (void *)[vc methodForSelector:aSelector];

// IMP is just a C function, so we can call it directly.
id returnValue = method(vc, aSelector, parameter1, parameter2);

Upvotes: 3

Vladimir
Vladimir

Reputation: 170859

You need to use NSInvocation class for that. Check this SO question for more details on using them.

Upvotes: 13

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