Question

I’ve got a function which creates a few different NSOperation subclasses.

They all use the same parameters the only thing that is different is the Class name.

At the moment I’ve got a function with a repeating block of code running through the function. Is it possible to pass the Class into a function so that the function can create the objects for me?

i.e.

- (void)createOperationSubclass:(Class*)class withParam:(int)parameter
{
    class *operation = [[class alloc] init];

    operation.parameter = parameter;

    [self.queue addOperation:operation];
}

or something like that? i.e. a generic class loader that doesn’t care what the class is.

Then I can run…

[self createOperationSubclass:MyOperationSubclass withParam:10];
[self createOperationSubclass:MyOtherOperationSubclass withParam:5];

Answer 1

Try this one:

- (void)createOperationSubclass:(Class)aClass withParam:(int)parameter
{
    id operation = [[aClass alloc] init];

    [operation setParameter:parameter];

    // If your parameter is an NSNumber: [operation setParameter:@(parameter)];

    [self.queue addOperation:operation];
}

Then you just call it like:

[self createOperationSubclass:[WhateverClass class] withParam:1];

PS: Note that class is a reserved keyword so it’s changed to aClass