View with two positions using AutoLayout - ios

Question

I have a list of views that I want to position. I have two states where the views should be positioned differently.
I am new to AutoLayout and I might be accessing this the wrong way - I am open to different ways of doing this.
I have created this to position a list of TabBarItem : UIView for the first state:
NSMutableDictionary* metrics = [#{#"margin": #(TAB_BAR_ITEM_MARGIN)} mutableCopy];
for (int i = 0; i < [self.tabBarItems count]; i++)
{
TabBarItem* item = [self.tabBarItems objectAtIndex:i];
if (i > 0)
{
TabBarItem* lastAddedItem = [self.tabBarItems objectAtIndex:i - 1];
NSDictionary *viewsDictionary = NSDictionaryOfVariableBindings(item, lastAddedItem);
NSArray *constraints = [NSLayoutConstraint constraintsWithVisualFormat:#"H:[item]-(==margin)-[lastAddedItem]" options:0 metrics:metrics views:viewsDictionary];
[self.view addConstraints:constraints];
}
else
{
NSDictionary *viewsDictionary = NSDictionaryOfVariableBindings(item);
NSArray *constraints = [NSLayoutConstraint constraintsWithVisualFormat:#"H:|-(>=0)-[item]-(==margin)-|" options:0 metrics:metrics views:viewsDictionary];
[self.view addConstraints:constraints];
}
NSDictionary *viewsDictionary = NSDictionaryOfVariableBindings(item);
NSArray *constraints = [NSLayoutConstraint constraintsWithVisualFormat:#"V:|-(==0)-[item]" options:0 metrics:metrics views:viewsDictionary];
[self.view addConstraints:constraints];
}
self.view is the superview of the TabBarItems.
Now I want to be able to move all the TabBarItems to completely different position (will probably require different constraints) using AutoLayout.
How should I approach this? Can I identify a constraint and remove it to add another?
As mentioned I am new to AutoLayout and really want to do this the right way :-)

Answer 1

I achieved this by having two NSMutableArrays: One for all the constraints needed in the first position and one for all the constraints needed in the other position. By doing that I was able to remove the active constraints from the first list and then add the new ones from the second list.
Not very elegant, but I couldn't find another way to do it.