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SEL selector = NSSelectorFromString(@"methodName:");

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NSInvocation *invocation = [[NSInvocation alloc] initWithSelector:selector];

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[invocation setTarget:targetObject];

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[invocation setArgument:&intValue atIndex:2];

[invocation setArgument:&floatValue atIndex:3];

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[invocation invoke];

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[invocation getReturnValue:&returnValue];

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@interface MyClass : NSObject

- (NSString *)greetWithName:(NSString *)name age:(NSInteger)age;

@end

@implementation MyClass

- (NSString *)greetWithName:(NSString *)name age:(NSInteger)age {

    return [NSString stringWithFormat:@"Hello, %@, you are %ld years old.", name, (long)age];

}

@end

int main() {

    MyClass *myObject = [[MyClass alloc] init];

    NSString *name = @"John";

    NSInteger age = 30;

    SEL selector = NSSelectorFromString(@"greetWithName:age:");

    NSInvocation *invocation = [NSInvocation invocationWithSelector:selector];

    [invocation setTarget:myObject];

    [invocation setArgument:&name atIndex:2];

    [invocation setArgument:&age atIndex:3];

    __unsafe_unretained NSString *returnValue;

    [invocation setReturnValue:&returnValue];

    [invocation invoke];

    NSLog(@"%@", returnValue);

    return 0;

}