How to call class method from NSString in obj-c?

Question

In obj-c, how can I call

[myClass myString];

where myString = @"myMethod";

Which should be the equivalent of [myClass myMethod];

Not sure if this kind of meta language manipulation is possible.

Answer 1

[myClass performSelector: NSSelectorFromString(myString)];

Docs:

• -performSelector: sends the selector specified to the receiver
• NSSelectorFromString() converts an NSString into a selector (type SEL)

Answer 2

[myClass class] returns the metaclass, class methods are called on the metaclass. E.g.

[NSString someClassMethod];

NSString *instanceOfString = @"some string instance";
[[instanceOfString class] someClassMethod];

EDIT: I misread the question. Use NSSelectorFromString to get a SEL from an NSString. That's documented in Apple's Foundation Functions Reference where you'll also see NSClassFromString, NSStringFromClass, NSStringFromSelector, NSStringFromProtocol and NSProtocolFromString amongst others.