CODEWITHSUNDEEP
iosswiftios-autolayout
Sargot
Sargot

Reputation: 83

Removing constraints that were added programatically

I read many topics about how to remove constraints that were added through the storyboard, drag outlet and then remove etc. but how I can remove constraints that were added programmatically? For example

firstView.topAnchor.constraints(equalTo: secondView.bottomAnchor, constant: 15).isActive = true

how can I deactivate it and then enable it again if needed. Maybe it should be something like?

firstView.removeConstraint(firstView.topAnchor.constraints(equalTo: secondView.bottomAnchor))

Upvotes: 3

Views: 8888

Answers (3)

Leo
Leo

Reputation: 356

You need to keep a reference to your constraint.

let constraintName: NSLayoutConstraint = firstView.topAnchor.constraint(equalTo: secondView.bottomAnchor, constant: 15)
constraintName.isActive = true

Disable it when you don't need it.

constraintName.isActive = false

Enable it when you want it back.

constraintName.isActive = true

Upvotes: 4

Bhavesh Dhaduk
Bhavesh Dhaduk

Reputation: 1906

Remove constraints will be deprecated in future.

Here is the alternate way to do the same.

Enable/Disable constraints do with below methods

Objective-C 

viewHeightConstraint.active = YES;      // Enable
viewHeightConstraint.active = NO;       // Disable

Swift

viewHeightConstraint.isActive = true   // Enable
viewHeightConstraint.isActive = false  // Disable

Upvotes: -3

Mr. Xcoder
Mr. Xcoder

Reputation: 4795

You should assign your constraint to a property in your ViewController. And then set .isActive to false instead of true.

Your code should look like this:

let myConstraint = firstView.topAnchor.constraint(equalTo: secondView.bottomAnchor, constant: 15)

Now, to activate it: 

myConstraint.isActive = true

And to disable it:

myConstraint.isActive = false

Upvotes: 8

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