Objective-C reflection; passing parameter to a method

Question

I need to use reflection/introspection in objective c. I am able to create instance by writing;

id object = [[NSClassFromString(@"UIView") alloc]init];

At this point, i also want it to set its frame.

I have written the code piece below, but it does not compile.

SEL method2 = NSSelectorFromString(@"setFrame:");
CGRect rect = CGRectMake(0, 0, 1024,768);
NSValue * value = [NSValue valueWithCGRect:rect];
[object performSelector:method2 withObject:value];

How can i pass the parameter to setFrame or setBackgroundColor method of an object.

Could you please help me to figure it out?

Thanks in advance

edit

i have found the solution i want,

there is a method called CGRectFromString(NSString*)

it solved my problem.

i am able to set the frame of a view with the code below

SEL method2 = NSSelectorFromString(@"setFrame:");

if([object respondsToSelector:method2])
{
    [object setFrame:CGRectFromString(@"{{0, 0}, {1024, 768}}")];
}

Answer 1

Try something like this, in my opinion it is more clear and straightforward. Note the the respondsToSelector is just to avoid crashing by sending a method to an object that does not implement it (in your question you are not checking that, so maybe is not needed in your case).

id object = [[NSClassFromString(@"UIView") alloc]init];

if(object respondsToSelector:@selector(setFrame:)){
  [object setFrame:CGRectMake(0, 0, 1024, 768)];
}