SnapKit Updating Constraint causes conflict












0















I'm building an iOS app against iOS 12 SDK, Swift 4 and SnapKit 4.2



I want to update a constraint when I tap a button but it creates a conflict with the previous version of the constraint.



Here's my code:



private var menuConstraint: Constraint?

override func updateViewConstraints() {
super.updateViewConstraints()

menuVc.view.snp.makeConstraints { (make) in
self.menuConstraint = make.top.equalTo(view.snp.top).constraint
make.right.equalTo(view.snp.right)

make.width.equalTo(100)
make.height.equalTo(100)
}
}

@objc func onMenuTap() {
self.menuConstraint!.update(offset: 100)
}


When onMenuTap is called I get the following error:



[LayoutConstraints] Unable to simultaneously satisfy constraints.
Probably at least one of the constraints in the following list is one you don't want.
Try this:
(1) look at each constraint and try to figure out which you don't expect;
(2) find the code that added the unwanted constraint or constraints and fix it.
(
"<SnapKit.LayoutConstraint:0xABC@MyViewController.swift#77 UIView:0xDEF.top == UIView:0xGHI.top>",
"<SnapKit.LayoutConstraint:0xABC@MyViewController.swift#77 UIView:0xDEF.top == UIView:0xGHI.top + 100.0>"
)


As you can see the previous version of the top constraint (without the offset) is conflicting with the new version. It's as if it didn't update the existing constraint but instead just created a new one.



I've tried a few variations:




  • wrapping the update line in a snp.updateConstraints closure

  • setting an initial offset when first creating the constraint

  • grabbing the underlying LayoutConstraint and updating constant directly.


I always get the same error message.



Do I have something configured wrong?










share|improve this question



























    0















    I'm building an iOS app against iOS 12 SDK, Swift 4 and SnapKit 4.2



    I want to update a constraint when I tap a button but it creates a conflict with the previous version of the constraint.



    Here's my code:



    private var menuConstraint: Constraint?

    override func updateViewConstraints() {
    super.updateViewConstraints()

    menuVc.view.snp.makeConstraints { (make) in
    self.menuConstraint = make.top.equalTo(view.snp.top).constraint
    make.right.equalTo(view.snp.right)

    make.width.equalTo(100)
    make.height.equalTo(100)
    }
    }

    @objc func onMenuTap() {
    self.menuConstraint!.update(offset: 100)
    }


    When onMenuTap is called I get the following error:



    [LayoutConstraints] Unable to simultaneously satisfy constraints.
    Probably at least one of the constraints in the following list is one you don't want.
    Try this:
    (1) look at each constraint and try to figure out which you don't expect;
    (2) find the code that added the unwanted constraint or constraints and fix it.
    (
    "<SnapKit.LayoutConstraint:0xABC@MyViewController.swift#77 UIView:0xDEF.top == UIView:0xGHI.top>",
    "<SnapKit.LayoutConstraint:0xABC@MyViewController.swift#77 UIView:0xDEF.top == UIView:0xGHI.top + 100.0>"
    )


    As you can see the previous version of the top constraint (without the offset) is conflicting with the new version. It's as if it didn't update the existing constraint but instead just created a new one.



    I've tried a few variations:




    • wrapping the update line in a snp.updateConstraints closure

    • setting an initial offset when first creating the constraint

    • grabbing the underlying LayoutConstraint and updating constant directly.


    I always get the same error message.



    Do I have something configured wrong?










    share|improve this question

























      0












      0








      0








      I'm building an iOS app against iOS 12 SDK, Swift 4 and SnapKit 4.2



      I want to update a constraint when I tap a button but it creates a conflict with the previous version of the constraint.



      Here's my code:



      private var menuConstraint: Constraint?

      override func updateViewConstraints() {
      super.updateViewConstraints()

      menuVc.view.snp.makeConstraints { (make) in
      self.menuConstraint = make.top.equalTo(view.snp.top).constraint
      make.right.equalTo(view.snp.right)

      make.width.equalTo(100)
      make.height.equalTo(100)
      }
      }

      @objc func onMenuTap() {
      self.menuConstraint!.update(offset: 100)
      }


      When onMenuTap is called I get the following error:



      [LayoutConstraints] Unable to simultaneously satisfy constraints.
      Probably at least one of the constraints in the following list is one you don't want.
      Try this:
      (1) look at each constraint and try to figure out which you don't expect;
      (2) find the code that added the unwanted constraint or constraints and fix it.
      (
      "<SnapKit.LayoutConstraint:0xABC@MyViewController.swift#77 UIView:0xDEF.top == UIView:0xGHI.top>",
      "<SnapKit.LayoutConstraint:0xABC@MyViewController.swift#77 UIView:0xDEF.top == UIView:0xGHI.top + 100.0>"
      )


      As you can see the previous version of the top constraint (without the offset) is conflicting with the new version. It's as if it didn't update the existing constraint but instead just created a new one.



      I've tried a few variations:




      • wrapping the update line in a snp.updateConstraints closure

      • setting an initial offset when first creating the constraint

      • grabbing the underlying LayoutConstraint and updating constant directly.


      I always get the same error message.



      Do I have something configured wrong?










      share|improve this question














      I'm building an iOS app against iOS 12 SDK, Swift 4 and SnapKit 4.2



      I want to update a constraint when I tap a button but it creates a conflict with the previous version of the constraint.



      Here's my code:



      private var menuConstraint: Constraint?

      override func updateViewConstraints() {
      super.updateViewConstraints()

      menuVc.view.snp.makeConstraints { (make) in
      self.menuConstraint = make.top.equalTo(view.snp.top).constraint
      make.right.equalTo(view.snp.right)

      make.width.equalTo(100)
      make.height.equalTo(100)
      }
      }

      @objc func onMenuTap() {
      self.menuConstraint!.update(offset: 100)
      }


      When onMenuTap is called I get the following error:



      [LayoutConstraints] Unable to simultaneously satisfy constraints.
      Probably at least one of the constraints in the following list is one you don't want.
      Try this:
      (1) look at each constraint and try to figure out which you don't expect;
      (2) find the code that added the unwanted constraint or constraints and fix it.
      (
      "<SnapKit.LayoutConstraint:0xABC@MyViewController.swift#77 UIView:0xDEF.top == UIView:0xGHI.top>",
      "<SnapKit.LayoutConstraint:0xABC@MyViewController.swift#77 UIView:0xDEF.top == UIView:0xGHI.top + 100.0>"
      )


      As you can see the previous version of the top constraint (without the offset) is conflicting with the new version. It's as if it didn't update the existing constraint but instead just created a new one.



      I've tried a few variations:




      • wrapping the update line in a snp.updateConstraints closure

      • setting an initial offset when first creating the constraint

      • grabbing the underlying LayoutConstraint and updating constant directly.


      I always get the same error message.



      Do I have something configured wrong?







      ios swift autolayout uikit snapkit






      share|improve this question













      share|improve this question











      share|improve this question




      share|improve this question










      asked Nov 25 '18 at 17:50









      Adam LangsnerAdam Langsner

      62111021




      62111021
























          1 Answer
          1






          active

          oldest

          votes


















          1














          Don't put constraints inside updateViewConstraints as it'll recreate constraints as it's called multiple times so set the code inside viewDidLoad






          share|improve this answer



















          • 1





            That worked! thanks. I was calling updateViewConstraints from within viewDidLoad but I moved all the code directly inside viewDidLoad and it fixed it. Thanks!

            – Adam Langsner
            Nov 25 '18 at 18:13











          Your Answer






          StackExchange.ifUsing("editor", function () {
          StackExchange.using("externalEditor", function () {
          StackExchange.using("snippets", function () {
          StackExchange.snippets.init();
          });
          });
          }, "code-snippets");

          StackExchange.ready(function() {
          var channelOptions = {
          tags: "".split(" "),
          id: "1"
          };
          initTagRenderer("".split(" "), "".split(" "), channelOptions);

          StackExchange.using("externalEditor", function() {
          // Have to fire editor after snippets, if snippets enabled
          if (StackExchange.settings.snippets.snippetsEnabled) {
          StackExchange.using("snippets", function() {
          createEditor();
          });
          }
          else {
          createEditor();
          }
          });

          function createEditor() {
          StackExchange.prepareEditor({
          heartbeatType: 'answer',
          autoActivateHeartbeat: false,
          convertImagesToLinks: true,
          noModals: true,
          showLowRepImageUploadWarning: true,
          reputationToPostImages: 10,
          bindNavPrevention: true,
          postfix: "",
          imageUploader: {
          brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
          contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
          allowUrls: true
          },
          onDemand: true,
          discardSelector: ".discard-answer"
          ,immediatelyShowMarkdownHelp:true
          });


          }
          });














          draft saved

          draft discarded


















          StackExchange.ready(
          function () {
          StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f53470239%2fsnapkit-updating-constraint-causes-conflict%23new-answer', 'question_page');
          }
          );

          Post as a guest















          Required, but never shown

























          1 Answer
          1






          active

          oldest

          votes








          1 Answer
          1






          active

          oldest

          votes









          active

          oldest

          votes






          active

          oldest

          votes









          1














          Don't put constraints inside updateViewConstraints as it'll recreate constraints as it's called multiple times so set the code inside viewDidLoad






          share|improve this answer



















          • 1





            That worked! thanks. I was calling updateViewConstraints from within viewDidLoad but I moved all the code directly inside viewDidLoad and it fixed it. Thanks!

            – Adam Langsner
            Nov 25 '18 at 18:13
















          1














          Don't put constraints inside updateViewConstraints as it'll recreate constraints as it's called multiple times so set the code inside viewDidLoad






          share|improve this answer



















          • 1





            That worked! thanks. I was calling updateViewConstraints from within viewDidLoad but I moved all the code directly inside viewDidLoad and it fixed it. Thanks!

            – Adam Langsner
            Nov 25 '18 at 18:13














          1












          1








          1







          Don't put constraints inside updateViewConstraints as it'll recreate constraints as it's called multiple times so set the code inside viewDidLoad






          share|improve this answer













          Don't put constraints inside updateViewConstraints as it'll recreate constraints as it's called multiple times so set the code inside viewDidLoad







          share|improve this answer












          share|improve this answer



          share|improve this answer










          answered Nov 25 '18 at 18:09









          Sh_KhanSh_Khan

          44.4k51431




          44.4k51431








          • 1





            That worked! thanks. I was calling updateViewConstraints from within viewDidLoad but I moved all the code directly inside viewDidLoad and it fixed it. Thanks!

            – Adam Langsner
            Nov 25 '18 at 18:13














          • 1





            That worked! thanks. I was calling updateViewConstraints from within viewDidLoad but I moved all the code directly inside viewDidLoad and it fixed it. Thanks!

            – Adam Langsner
            Nov 25 '18 at 18:13








          1




          1





          That worked! thanks. I was calling updateViewConstraints from within viewDidLoad but I moved all the code directly inside viewDidLoad and it fixed it. Thanks!

          – Adam Langsner
          Nov 25 '18 at 18:13





          That worked! thanks. I was calling updateViewConstraints from within viewDidLoad but I moved all the code directly inside viewDidLoad and it fixed it. Thanks!

          – Adam Langsner
          Nov 25 '18 at 18:13




















          draft saved

          draft discarded




















































          Thanks for contributing an answer to Stack Overflow!


          • Please be sure to answer the question. Provide details and share your research!

          But avoid



          • Asking for help, clarification, or responding to other answers.

          • Making statements based on opinion; back them up with references or personal experience.


          To learn more, see our tips on writing great answers.




          draft saved


          draft discarded














          StackExchange.ready(
          function () {
          StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f53470239%2fsnapkit-updating-constraint-causes-conflict%23new-answer', 'question_page');
          }
          );

          Post as a guest















          Required, but never shown





















































          Required, but never shown














          Required, but never shown












          Required, but never shown







          Required, but never shown

































          Required, but never shown














          Required, but never shown












          Required, but never shown







          Required, but never shown







          Popular posts from this blog

          404 Error Contact Form 7 ajax form submitting

          How to know if a Active Directory user can login interactively

          TypeError: fit_transform() missing 1 required positional argument: 'X'