Question

I have a NSMutableArray that holds a collection of UIViewControllers

Amongst other properties and methods an instance of each of the viewControllers are placed in a parent view

The user will place these objects individually when desired to.

So essentially I use – (void)addSubview:(UIView *)view when a new view is added to the parent view controller.

Because the UI is isometric it’s made things a tad more complicated

What I am trying to do is re-order the views based on their co-ordinate position, so items higher up the parent UIView frame is indexed lower then views lower in the parent UIview frame. And items that are on the left side of the view are positioned at a higher index to those on the right

I think the solution may have to do with re-ordering the NSMutableArray but how can I compare the CGpoints? Do I need to compare the x and y separately?

Answer 1

I’ve managed to resolve this, I did some reading on Key-Value Coding

I created a property called itemY to store the view.frame.origin.y value.

I created a method to re-assign the itemY with the current view.frame.origin.y value.

Now the ViewController that stores the array of ViewControllers uses a instance NSSortDescriptor with the property itemY.

A new NSArray is created using the NSSortDescriptor

Now I loop through the new NSArray and carry out my logic