ios - Prevent Interface Builder from auto creating Constraints? -

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i created demo project here. have view created scrollview in .xib file. in interface builder did not set constraints. in viewdidload method set constraints snapkit:

scrollview.snp_makeconstraints { (make) -> void in   make.edges.equalto(self.view) }

when run code following console output: 

unable simultaneously satisfy constraints.     @ least 1 of constraints in following list 1 don't want. try this: (1) @ each constraint , try figure out don't expect; (2) find code added unwanted constraint or constraints , fix it. (note: if you're seeing nsautoresizingmasklayoutconstraints don't understand, refer documentation uiview property translatesautoresizingmaskintoconstraints)  (     "<nsibprototypinglayoutconstraint:0x7b74e280 'ib auto generated @ build time view fixed frame' v:|-(1)-[uiscrollview:0x7b74c430]   (names: '|':uiview:0x7b74dd10 )>",     "<<deviceimagestest.layoutconstraint:0x7baa2760> <uiscrollview:0x7b6608d0>.top == <uiview:0x7b64d800>.top>" )  attempt recover breaking constraint  <nsibprototypinglayoutconstraint:0x7b74e280 'ib auto generated @ build time view fixed frame' v:|-(1)-[uiscrollview:0x7b74c430]   (names: '|':uiview:0x7b74dd10 )>  break on objc_exception_throw catch in debugger. methods in uiconstraintbasedlayoutdebugging category on uiview listed in <uikit/uiview.h> may helpful. 2015-05-29 18:37:14.368 deviceimagestest[36462:607] unable simultaneously satisfy constraints.     @ least 1 of constraints in following list 1 don't want. try this: (1) @ each constraint , try figure out don't expect; (2) find code added unwanted constraint or constraints , fix it. (note: if you're seeing nsautoresizingmasklayoutconstraints don't understand, refer documentation uiview property translatesautoresizingmaskintoconstraints)  (     "<nsibprototypinglayoutconstraint:0x7b74e080 'ib auto generated @ build time view fixed frame' h:|-(0)-[uiscrollview:0x7b74c430](ltr)   (names: '|':uiview:0x7b74dd10 )>",     "<nsibprototypinglayoutconstraint:0x7b74e330 'ib auto generated @ build time view fixed frame' h:[uiscrollview:0x7b74c430(600)]>",     "<<deviceimagestest.layoutconstraint:0x7baa7170> <uiscrollview:0x7baa7b30>.right == <uiview:0x7baa79a0>.right>",     "<nsautoresizingmasklayoutconstraint:0x7baa4800 h=-&- v=-&- uiview:0x7b74dd10.width == uiviewcontrollerwrapperview:0x7ba9f060.width>",     "<nsautoresizingmasklayoutconstraint:0x7baa5180 h=-&- v=-&- uiviewcontrollerwrapperview:0x7ba9f060.width == uinavigationtransitionview:0x7bc769b0.width>",     "<nsautoresizingmasklayoutconstraint:0x7baa58e0 h=-&- v=-&- uinavigationtransitionview:0x7bc769b0.width == uilayoutcontainerview:0x7bc75140.width>",     "<nsautoresizingmasklayoutconstraint:0x7baa61a0 h=-&- v=-&- uilayoutcontainerview:0x7bc75140.width == uiwindow:0x7bc71870.width>",     "<nsautoresizingmasklayoutconstraint:0x7baa69a0 h=--- v=--- h:[uiwindow:0x7bc71870(320)]>" )  attempt recover breaking constraint  <<deviceimagestest.layoutconstraint:0x7baa95b0> <uiscrollview:0x7baa9610>.right == <uiview:0x7baa96b0>.right>  break on objc_exception_throw catch in debugger. methods in uiconstraintbasedlayoutdebugging category on uiview listed in <uikit/uiview.h> may helpful. 2015-05-29 18:37:14.496 deviceimagestest[36462:607] unable simultaneously satisfy constraints.     @ least 1 of constraints in following list 1 don't want. try this: (1) @ each constraint , try figure out don't expect; (2) find code added unwanted constraint or constraints , fix it. (note: if you're seeing nsautoresizingmasklayoutconstraints don't understand, refer documentation uiview property translatesautoresizingmaskintoconstraints)  (     "<nsibprototypinglayoutconstraint:0x7b74e360 'ib auto generated @ build time view fixed frame' v:[uiscrollview:0x7b74c430(600)]>",     "<<deviceimagestest.layoutconstraint:0x7bc77e40> <uiscrollview:0x7bc7f6a0>.top == <uiview:0x7bc52180>.top>",     "<<deviceimagestest.layoutconstraint:0x7bc49420> <uiscrollview:0x7bc74b00>.bottom == <uiview:0x7bc7b970>.bottom>",     "<nsautoresizingmasklayoutconstraint:0x7baa4960 h=-&- v=-&- uiview:0x7b74dd10.height == uiviewcontrollerwrapperview:0x7ba9f060.height>",     "<nsautoresizingmasklayoutconstraint:0x7baa51e0 h=-&- v=-&- uiviewcontrollerwrapperview:0x7ba9f060.height == uinavigationtransitionview:0x7bc769b0.height>",     "<nsautoresizingmasklayoutconstraint:0x7baa5940 h=-&- v=-&- uinavigationtransitionview:0x7bc769b0.height == uilayoutcontainerview:0x7bc75140.height>",     "<nsautoresizingmasklayoutconstraint:0x7baa6200 h=-&- v=-&- uilayoutcontainerview:0x7bc75140.height == uiwindow:0x7bc71870.height>",     "<nsautoresizingmasklayoutconstraint:0x7baa69d0 h=--- v=--- v:[uiwindow:0x7bc71870(568)]>" )  attempt recover breaking constraint  <<deviceimagestest.layoutconstraint:0x7bc84790> <uiscrollview:0x7bc848b0>.bottom == <uiview:0x7bc84860>.bottom>  break on objc_exception_throw catch in debugger. methods in uiconstraintbasedlayoutdebugging category on uiview listed in <uikit/uiview.h> may helpful.

it seems interface builder generating constraints me if did not set any. leads conflict constraints set in code. set settranslatesautoresizingmasks(false).

how can prevent interface builder auto generating constraints?

if confused nsautoresizingmasklayoutconstraints in list, might because haven't called settranslatesautoresizingmasksintocontraints(false) on view. (although, under impression snapkit you).

if confused nsibprototypinglayoutconstraint, that's auto-generated constraint interface builder. rid of it, add top, bottom, leading , trailing constraints in interface builder , set them removed @ build time. more details that, have @ http://travisjeffery.com/b/2013/11/preventing-ib-auto-generated-at-build-time-for-view-with-fixed-frame/

update: url changed http://travisjeffery.com/b/2013/11/preventing-ib-auto-generated-at-build-time-for-view-with-fixed-frame-when-using-auto-layout/


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