NSClassFromString works for string literals, returns nil for constructed strings

Question

I am trying to create an instance of a type based on another type passed to a method. I find that NSClassFromStringworks just fine if used with a string literal, as in

id instance = [[NSClassFromString(@"TheNameOfTheClassIWant") alloc] init];

but if I build a line with something like

NSString *inClassName = [[protoInstance class] description];
NSString *outClassName = [inClassName stringByAppendingFormat:@"IWant"];
id instance = [[NSClassFromString(outClassName) alloc] init];

what instance- nil. Does it work NSClassFromStringonly with literals? Does something happen at compile time to get the job done NSClassFromString?

Answer 1

I never had a problem using this call (provided, I only needed this a few times).

You have:

• , outClassName ( )?
• , /? / ?
• NSClassFromString' - just to ensure that init` 0 ( )

Answer 2

, , [ ] . NSStringFromClass, , , ?

Answer 3

, . : - .