ios - What's wrong with my auto layout constraints? -


here uiviewcontroller before press button (i didn't put there not relevant):

enter image description here

when press button, uiview containing 2 uipickerview appear top. right under uiview 2 uibuttons. everthing works auto layout:

enter image description here

here code when create constraints:

let okbuttonheight: cgfloat = 53 let okbuttonwidth: cgfloat = 53 let leftpickerviewwidth: cgfloat = 80 let leftpickerviewheight: cgfloat = 200 let margin: cgfloat = 8  // frame let constraint0 = nslayoutconstraint(item: okbutton, attribute: .bottom, relatedby: .equal, toitem: self.view, attribute: .top, multiplier: 1, constant: 0) let constraint1 = nslayoutconstraint(item: frameview, attribute: .centerx, relatedby: .equal, toitem: view, attribute: .centerx, multiplier: 1, constant: 0)  // left & right pickerviews let constraint2 = nslayoutconstraint(item: leftpickerview, attribute: .width, relatedby: .equal, toitem: rightpickerview, attribute: .width, multiplier: 1, constant: 0) let constraint3 = nslayoutconstraint(item: leftpickerview, attribute: .height, relatedby: .equal, toitem: rightpickerview, attribute: .height, multiplier: 1, constant: 0) let constraint4 = nslayoutconstraint(item: leftpickerview, attribute: .trailing, relatedby: .equal, toitem: rightpickerview, attribute: .leading, multiplier: 1, constant: -margin) let constraint5 = nslayoutconstraint(item: leftpickerview, attribute: .top, relatedby: .equal, toitem: rightpickerview, attribute: .top, multiplier: 1, constant: 0)  // left pickerview let constraint6 = nslayoutconstraint(item: leftpickerview, attribute: .height, relatedby: .equal, toitem: nil, attribute: .notanattribute, multiplier: 1, constant: leftpickerviewheight) let constraint7 = nslayoutconstraint(item: leftpickerview, attribute: .width, relatedby: .equal, toitem: nil, attribute: .notanattribute, multiplier: 1, constant: leftpickerviewwidth) let constraint8 = nslayoutconstraint(item: leftpickerview, attribute: .top, relatedby: .equal, toitem: frameview, attribute: .top, multiplier: 1, constant: -margin) let constraint9 = nslayoutconstraint(item: leftpickerview, attribute: .bottom, relatedby: .equal, toitem: frameview, attribute: .bottom, multiplier: 1, constant: margin) let constraint10 = nslayoutconstraint(item: leftpickerview, attribute: .leading, relatedby: .equal, toitem: frameview, attribute: .leading, multiplier: 1, constant: margin)  // right pickerview let constraint11 = nslayoutconstraint(item: rightpickerview, attribute: .trailing, relatedby: .equal, toitem: frameview, attribute: .trailing, multiplier: 1, constant: -margin)  // ok & cancel buttons let constraint12 = nslayoutconstraint(item: okbutton, attribute: .top, relatedby: .equal, toitem: cancelbutton, attribute: .top, multiplier: 1, constant: 0) let constraint13 = nslayoutconstraint(item: okbutton, attribute: .bottom, relatedby: .equal, toitem: cancelbutton, attribute: .bottom, multiplier: 1, constant: 0) let constraint14 = nslayoutconstraint(item: okbutton, attribute: .width, relatedby: .equal, toitem: cancelbutton, attribute: .width, multiplier: 1, constant: 0) let constraint15 = nslayoutconstraint(item: okbutton, attribute: .height, relatedby: .equal, toitem: cancelbutton, attribute: .height, multiplier: 1, constant: 0)  // ok button let constraint16 = nslayoutconstraint(item: view, attribute: .centerx, relatedby: .equal, toitem: okbutton, attribute: .trailing, multiplier: 1, constant: 10) let constraint17 = nslayoutconstraint(item: okbutton, attribute: .width, relatedby: .equal, toitem: nil, attribute: .notanattribute, multiplier: 1, constant: okbuttonwidth) let constraint18 = nslayoutconstraint(item: okbutton, attribute: .height, relatedby: .equal, toitem: nil, attribute: .notanattribute, multiplier: 1, constant: okbuttonheight) let constraint19 = nslayoutconstraint(item: okbutton, attribute: .top, relatedby: .equal, toitem: frameview, attribute: .bottom, multiplier: 1, constant: 10)  // cancel button let constraint20 = nslayoutconstraint(item: view, attribute: .centerx, relatedby: .equal, toitem: cancelbutton, attribute: .leading, multiplier: 1, constant: -10)  view.addconstraint(constraint0) view.addconstraint(constraint1) view.addconstraint(constraint12) view.addconstraint(constraint13) view.addconstraint(constraint14) view.addconstraint(constraint15) view.addconstraint(constraint16) view.addconstraint(constraint17) view.addconstraint(constraint18) view.addconstraint(constraint19) view.addconstraint(constraint20)  frameview.addconstraint(constraint2) frameview.addconstraint(constraint3) frameview.addconstraint(constraint4) frameview.addconstraint(constraint5) frameview.addconstraint(constraint6) frameview.addconstraint(constraint7) frameview.addconstraint(constraint8) frameview.addconstraint(constraint9) frameview.addconstraint(constraint10) frameview.addconstraint(constraint11)  selectioncurrencyconstraintlist = [constraint0, constraint1, constraint2, constraint3, constraint4, constraint5, constraint6, constraint7, constraint8, constraint9, constraint10, constraint11, constraint12, constraint13, constraint14, constraint15, constraint16, constraint17, constraint18, constraint19, constraint20]  frameview.hidden = true okbutton.hidden = true cancelbutton.hidden = true

at point, uiview , 2 buttons hidden above top of screen.

when press button make appear, execute code:

frameview.hidden = hide okbutton.hidden = hide cancelbutton.hidden = hide  if var constraints = selectioncurrencyconstraintlist {     let topframeconstraint = constraints[0]     view.removeconstraint(topframeconstraint)     constraints.removeatindex(0)     let newtopconstraint: nslayoutconstraint!     if hide {         newtopconstraint = nslayoutconstraint(item: okbutton, attribute: .bottom, relatedby: .equal, toitem: self.view, attribute: .top, multiplier: 1, constant: 0)     } else {         newtopconstraint = nslayoutconstraint(item: frameview, attribute: .top, relatedby: .equal, toitem: topview, attribute: .bottom, multiplier: 1, constant: margin)     }     constraints.insert(newtopconstraint, atindex: 0)     view.addconstraint(newtopconstraint) }  uiview.animatewithduration(0.5) {     self.view.layoutifneeded() }

when replace constraint nslayoutconstraint(item: okbutton, attribute: .bottom, relatedby: .equal, toitem: self.view, attribute: .top, multiplier: 1, constant: 0) 1 nslayoutconstraint(item: frameview, attribute: .top, relatedby: .equal, toitem: topview, attribute: .bottom, multiplier: 1, constant: margin) works fine.

when reverse it, got constraints cannot satisfied:

2015-05-15 20:17:25.374 currencyex[624:42779] 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)  (     "<nslayoutconstraint:0x17408de30 v:[uiview:0x174186660(50)]>",     "<nslayoutconstraint:0x174090fe0 v:[_uilayoutguide:0x1741a8a40]-(0)-[uiview:0x174186660]>",     "<_uilayoutsupportconstraint:0x1740a3e40 v:[_uilayoutguide:0x1741a8a40(20)]>",     "<_uilayoutsupportconstraint:0x1740a3d80 v:|-(0)-[_uilayoutguide:0x1741a8a40]   (names: '|':uiview:0x174186590 )>",     "<nslayoutconstraint:0x170089150 v:[uibutton:0x146e49020(53)]>",     "<nslayoutconstraint:0x1700891a0 v:[uiview:0x1741868d0]-(10)-[uibutton:0x146e49020]>",     "<nslayoutconstraint:0x170088d90 v:[uipickerview:0x146e09ef0(200)]>",     "<nslayoutconstraint:0x170088e30 v:|-(-8)-[uipickerview:0x146e09ef0]   (names: '|':uiview:0x1741868d0 )>",     "<nslayoutconstraint:0x170088e80 uipickerview:0x146e09ef0.bottom == uiview:0x1741868d0.bottom + 8>",     "<nslayoutconstraint:0x17008ef60 v:[uiview:0x174186660]-(8)-[uiview:0x1741868d0]>",     "<nslayoutconstraint:0x174096620 uibutton:0x146e49020.bottom == uiview:0x174186590.top>" )  attempt recover breaking constraint  <nslayoutconstraint:0x170088e80 uipickerview:0x146e09ef0.bottom == uiview:0x1741868d0.bottom + 8>  make symbolic breakpoint @ uiviewalertforunsatisfiableconstraints catch in debugger. methods in uiconstraintbasedlayoutdebugging category on uiview listed in <uikit/uiview.h> may helpful. 2015-05-15 20:17:25.377 currencyex[624:42779] 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)  (     "<nslayoutconstraint:0x17408de30 v:[uiview:0x174186660(50)]>",     "<nslayoutconstraint:0x174090fe0 v:[_uilayoutguide:0x1741a8a40]-(0)-[uiview:0x174186660]>",     "<_uilayoutsupportconstraint:0x1740a3e40 v:[_uilayoutguide:0x1741a8a40(20)]>",     "<_uilayoutsupportconstraint:0x1740a3d80 v:|-(0)-[_uilayoutguide:0x1741a8a40]   (names: '|':uiview:0x174186590 )>",     "<nslayoutconstraint:0x170089150 v:[uibutton:0x146e49020(53)]>",     "<nslayoutconstraint:0x1700891a0 v:[uiview:0x1741868d0]-(10)-[uibutton:0x146e49020]>",     "<nslayoutconstraint:0x17008ef60 v:[uiview:0x174186660]-(8)-[uiview:0x1741868d0]>",     "<nslayoutconstraint:0x174096620 uibutton:0x146e49020.bottom == uiview:0x174186590.top>" )  attempt recover breaking constraint  <nslayoutconstraint:0x17408de30 v:[uiview:0x174186660(50)]>  make symbolic breakpoint @ uiviewalertforunsatisfiableconstraints catch in debugger. methods in uiconstraintbasedlayoutdebugging category on uiview listed in <uikit/uiview.h> may helpful. 2015-05-15 20:17:25.378 currencyex[624:42779] 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)  (     "<nslayoutconstraint:0x174090fe0 v:[_uilayoutguide:0x1741a8a40]-(0)-[uiview:0x174186660]>",     "<_uilayoutsupportconstraint:0x1740a3e40 v:[_uilayoutguide:0x1741a8a40(20)]>",     "<_uilayoutsupportconstraint:0x1740a3d80 v:|-(0)-[_uilayoutguide:0x1741a8a40]   (names: '|':uiview:0x174186590 )>",     "<nslayoutconstraint:0x170089150 v:[uibutton:0x146e49020(53)]>",     "<nslayoutconstraint:0x1700891a0 v:[uiview:0x1741868d0]-(10)-[uibutton:0x146e49020]>",     "<nslayoutconstraint:0x17008ef60 v:[uiview:0x174186660]-(8)-[uiview:0x1741868d0]>",     "<nslayoutconstraint:0x174096620 uibutton:0x146e49020.bottom == uiview:0x174186590.top>" )  attempt recover breaking constraint  <nslayoutconstraint:0x1700891a0 v:[uiview:0x1741868d0]-(10)-[uibutton:0x146e49020]>

i don't understand why. works @ first constraints. when modify of them works, , when put them back, doesn't work anymore...

any idea?

let's call constraints:

constrainthide: okbutton bottom aligned superview top.
constraintshow: frameview 8 points under topview.

if inspect colliding constraints in log 1 one, notice both of constraints constrainthide , constraintshow present in same time.

this caused removal/addition of constraints.

  1. initial state

only constrainthide in view

  1. state after showing view

constrainthide correctly removed, constraintshow added

  1. state after hiding view

constraintshow not removed, constrainthide added

  1. collision

now question why step 3 hasn't removed constraint? because of bug in step 2. selectioncurrencyconstraintlist not correctly updated in step 3 attempting remove original constrainthide constraint instead of constraint constraintshow added step 2.

this due fact if var constraints = selectioncurrencyconstraintlist makes copy of array. have save changes in end.

solution

add

selectioncurrencyconstraintlist = constraints

to end of block.

having said that, can drastically simplify code adding of constraints in interface builder, connect constraintshow , constrainthide outlets , instead of removing/addding them, change priority on them 0 1000.


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