Install/Uninstall constraint programmatically [closed]

Question

Closed. This question needs details or clarity. It is not currently accepting answers.

Want to improve this question? As written, this question is lacking some of the information it needs to be answered. If the author adds details in comments, consider editing them into the question. Once there's sufficient detail to answer, vote to reopen the question.

Closed 10 years ago.

Improve this question

Is there a way to install and uninstall an Xcode interface builder constraint programmatically?

enter image description here

take a look at open source project like mansory and pure layout on github. They are better and easier to code — Wingzero
– Wingzero, Commented May 28, 2015 at 1:40
Is there a way to get this question unclosed, as the meaning of the question is now obvious, and the correct answer is in a comment of an outdated answer? — timeSmith
– timeSmith, Commented Oct 24, 2019 at 4:44

nhgrif · Accepted Answer · 2015-05-28 01:12:39Z

22

Connect the IBOutlet for the NSLayoutConstraint by CTRL+click the constraint and drag it to the viewController (for ex. @property (weak, nonatomic) IBOutlet NSLayoutConstraint *constraint;).

For removing the constraint:

[self.view removeConstraint:constraint]

for installing the constraint:

[self.view addConstraint:constraint]

edited May 28, 2015 at 1:12

nhgrif

62.2k25 gold badges136 silver badges174 bronze badges

answered May 28, 2015 at 0:47

A C

7297 silver badges17 bronze badges

Sign up to request clarification or add additional context in comments.

15 Comments

Eric Over a year ago

So if a constraint starts out uninstalled, then by addConstraint will become installed?

nhgrif Over a year ago

@Eric "uninstall" is the wrong terminology here... uninstall is strictly in reference to the storyboard and has nothing to do with anything done programmatically at run time.

Pat Niemeyer Over a year ago

In iOS 8 there is an active property on constraint that corresponds to the "uninstalled" setting in XCode. Simply leave one constraint uninstalled in XCode with your alternate values and then switch between them by alternating their active states at run time.

ullstrm Over a year ago

Just for the record! It might be dangerous to have a weak reference to the constraint if it will be added/removed in code! It might get released!

scord Over a year ago

This solution is deprecated. use NSLayoutConstraint's active property instead.

|

Collectives™ on Stack Overflow

Install/Uninstall constraint programmatically [closed]

1 Answer 1

15 Comments

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

15 Comments

Related