ios - Objective C, app crashes when changing root view controller. Orphaned without delegate (bug!) -


i've implemented dropdown menu ios app calls functions navigate between different storyboards. each element in menu calls following function in appdelegate class different storyboard name: 

(void)changecontroller:(nsstring*)storyboardname {     uistoryboard *storyboard = [uistoryboard storyboardwithname:storyboardname bundle:[nsbundle mainbundle]];      //initialize new view     currentview = [storyboard instantiateinitialviewcontroller];     currentview.view.alpha = 0.0;     currentview.view.frame = currentview.view.bounds;     currentview.view.autoresizingmask = uiviewautoresizingflexiblewidth | uiviewautoresizingflexibleheight;      //the app crashes on line thread 1: signal sigarbt message     self.window.rootviewcontroller = currentview;     [self.window makekeyandvisible];      //animate fade transition     [uiview animatewithduration:transitionduration                           delay:0.0                         options:uiviewanimationoptioncurvelinear                      animations:^{currentview.view.alpha = 1.0;}                      completion:^(bool finished){}]; }

the problem function gets called crashes app inconsistently. works screens , not others. , worse, works on screens crashes on.

there 2 error messages dumped console, , (i've added line breaks readability):

objective: {  objective 0x15e4b3c0: <750:-1.64135e-05> + <750:8.34465e-08>  *<orphaned without delegate (bug!):0x1703c790>{id: 188} + <750:4.17233e-08>  *<orphaned without delegate (bug!):0x1703c980>{id: 192} + <750:-2.68221e-08>  *uiview:0x170c6e40.height{id: 1091} }

and

uncaught exception: <nsisengine: 0x15e0b380>{ rows:     uiwindow:0x15db3160.height{id: 140} == 960 + 1*0x15dd03e0.marker{id: 144}     uiwindow:0x15db3160.width{id: 137} == 640 + 1*0x15dd03b0.marker{id: 141}     uiwindow:0x15db3160.minx{id: 136} == 0 + 2*0x15dd0200.marker{id: 135} + -0.5*0x15dd03b0.marker{id: 141}     uiwindow:0x15db3160.miny{id: 139} == 0 + 2*0x15dd0350.marker{id: 138} + -0.5*0x15dd03e0.marker{id: 144}     objective{id: 1} == {          objective 0x15e4b3c0: <750:-1.64135e-05> + <750:8.34465e-08>          *<orphaned without delegate (bug!):0x1703c790>{id: 188} + <750:4.17233e-08>          *<orphaned without delegate (bug!):0x1703c980>{id: 192} + <750:-2.68221e-08>          *uiview:0x170c6e40.height{id: 1091}}       constraints:          <nsautoresizingmasklayoutconstraint:0x15dd03b0 h=--- v=--- h:[uiwindow:0x15db3160(320)]>       marker:0x15dd03b0.marker{id: 141}          <nsautoresizingmasklayoutconstraint:0x15dd03e0 h=--- v=--- v:[uiwindow:0x15db3160(480)]>       marker:0x15dd03e0.marker{id: 144}          <_uiwindowanchoringconstraint:0x15dd0200 h=--- v=--- uiwindow:0x15db3160.midx == + 160>        marker:0x15dd0200.marker{id: 135}          <_uiwindowanchoringconstraint:0x15dd0350 h=--- v=--- uiwindow:0x15db3160.midy == + 240>        marker:0x15dd0350.marker{id: 138}      integralization adjustments:          (none)      statistics:     4 rows. variable counts:             1 ->   2             2 ->   2 }: internal error.  cannot find outgoing row head incoming head uiview:0x170c6e40.height{id: 1091}, should never happen.

it's last line confuses me, "internal error .... should never happen."

i'm curious if else has encountered error, , how tackled it.

  • is issue initializing variable currentview, or perhaps appdelegate's window variable?

  • is issue storyboard constraints? , if so, there limit number of constraints can/should put on single screen?

edit:

i figured out error caused when navigating away 1 particular storyboard. constraint on screen throwing error. added code changecontroller: programmatically remove constraints every subview , remove every subview superview.

the problem resolved when constraints in offending uiviewcontroller cleared , recreated.

thanks , suggestions.


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