myViewController = [[MyViewController alloc] initWithNibName:@"MyView" bundle:nil];
myViewController.view.frame = CGRectMake(0, 100, myViewController.view.frame.size.width, myViewController.view.frame.size.height);  
[mainCanvas addSubview: myViewController.view];

how to add sub view add a specific location

Add subview add a specific position

Objective C