Question

The user see one image, and it should change to another according to the if statment (true or false) – not sure how to do it in objective-c

Answer 1

Use this code:

imageView.image = (your true-or-false expression) ? [UIImage imageNamed:@"foo.png"] : [UIImage imageNamed:@"bar.png"];

If true, you get foo.png for your image, otherwise bar.png.

Let me know if it works for you.