Question

Why does NSClassFromString return nil ? As per the definition it has to return class name.
How should I take care to rectify this problem? I need to instantiate a class from string and call the method, which is in the class, using the instance created.

This is how my code looks like:

id myclass = [[NSClassFromString(@"Class_from_String") alloc] init];
[myclass method_from_class];

But the method_from_class function is not being called, control is not going into it. And my code is error free. Any idea how to solve this in Objective-C?

Answer 1

The Documentation for the function says:

Return Value
The class object named by
aClassName, or nil if no class by that
name is currently loaded. If
aClassName is nil, returns nil.

An example of how this should be properly used is as follows:

Class dictionaryClass = NSClassFromString(@"NSMutableDictionary");
id object = [[dictionaryClass alloc] init];
[object setObject:@"Foo" forKey:@"Bar"];