iOS AutoLayout issue: Unable to simultaneously satisfy constraints

Question

Steps:

I have two tableview in a page, but show one tableView at a time;
I created a view for tableview's header view(call it as headerView);
I set the headerView for the current tableView(A) as tableHeaderView, and set nil for another tableView(B) as tableHeaderView(show A);
I click a button to show tableView(B), so I set nil as tableHeaderView for tableView(A), set headerView as tableHeaderView for tableView(B);

When I set headerView for tableView(N) the error is coming, detail please take a look at below logs. The console error log as below:

    2015-12-04 10:15:18.777 XXXApp[1223:360705] 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. 
(
    "<NSLayoutConstraint:0x7f8f7bdd74b0 H:|-(10)-[UIView:0x7f8f7bdbbe00]   (Names: '|':MarketGoodsDetail:0x7f8f7bdb92d0 )>",
    "<NSLayoutConstraint:0x7f8f7bdd7500 H:[UIView:0x7f8f7bdbbe00]-(10)-|   (Names: '|':MarketGoodsDetail:0x7f8f7bdb92d0 )>",
    "<NSLayoutConstraint:0x7f8f7bdd8fa0 H:|-(0)-[MarketGoodsDetail:0x7f8f7bdb92d0]   (Names: '|':UIView:0x7f8f7bdd8b70 )>",
    "<NSLayoutConstraint:0x7f8f7bdd8ff0 H:[MarketGoodsDetail:0x7f8f7bdb92d0]-(0)-|   (Names: '|':UIView:0x7f8f7bdd8b70 )>",
    "<NSLayoutConstraint:0x7f8f7bddac40 H:[UIView:0x7f8f7bdd8b70]-(0)-|   (Names: '|':UIView:0x7f8f7bdda860 )>",
    "<NSLayoutConstraint:0x7f8f7bddace0 H:|-(0)-[UIView:0x7f8f7bdd8b70]   (Names: '|':UIView:0x7f8f7bdda860 )>",
    "<NSLayoutConstraint:0x7f8f7e0c6d90 'UIView-Encapsulated-Layout-Width' H:[UIView:0x7f8f7bdda860(0)]>"
)

Will attempt to recover by breaking constraint 
<NSLayoutConstraint:0x7f8f7bdd7500 H:[UIView:0x7f8f7bdbbe00]-(10)-|   (Names: '|':MarketGoodsDetail:0x7f8f7bdb92d0 )>

Make a symbolic breakpoint at UIViewAlertForUnsatisfiableConstraints to catch this in the debugger.
The methods in the UIConstraintBasedLayoutDebugging category on UIView listed in <UIKit/UIView.h> may also be helpful.

As Jason Jarrett's blog http://staxmanade.com/2015/06/debugging-ios-autolayout-issues/ I printed the auto layout info of the view which I think it caused the problem as below:

po [0x7f8f7bdb92d0 recursiveDescription]
<MarketGoodsDetail: 0x7f8f7bdb92d0; frame = (0 0; 375 127); autoresize = RM+BM; userInteractionEnabled = NO; layer = <CALayer: 0x7f8f7bdb9760>>
   | <UILabel: 0x7f8f7bdb9b80; frame = (10 8.5; 37.5 12); text = '(广贵所)'; opaque = NO; autoresize = RM+BM; userInteractionEnabled = NO; layer = <_UILabelLayer: 0x7f8f7bdb9780>>
   |    | <_UILabelContentLayer: 0x7f8f7bfc4090> (layer)
   | <UILabel: 0x7f8f7bdba820; frame = (10 22.5; 121.5 36); text = '2892.00'; opaque = NO; autoresize = RM+BM; userInteractionEnabled = NO; layer = <_UILabelLayer: 0x7f8f7bdb9f10>>
   | <UILabel: 0x7f8f7bdbb460; frame = (237.5 35; 52.5 20.5); text = '-13.00'; opaque = NO; autoresize = RM+BM; userInteractionEnabled = NO; layer = <_UILabelLayer: 0x7f8f7bdbb660>>
   | <UILabel: 0x7f8f7bdbb9c0; frame = (307 35; 58 20.5); text = '-0.45%'; opaque = NO; autoresize = RM+BM; userInteractionEnabled = NO; layer = <_UILabelLayer: 0x7f8f7bdbbbc0>>
   | <UIView: 0x7f8f7bdbbe00; frame = (10 63.5; 355 0.5); autoresize = RM+BM; layer = <CALayer: 0x7f8f7bdbbf70>>
   | <UILabel: 0x7f8f7bdbc0b0; frame = (10 76; 26 16); text = '今开'; opaque = NO; autoresize = RM+BM; userInteractionEnabled = NO; layer = <_UILabelLayer: 0x7f8f7bdbc2b0>>
   |    | <_UILabelContentLayer: 0x7f8f7e0c2a90> (layer)
   | <UILabel: 0x7f8f7bdbcd70; frame = (42 76; 51.5 16); text = '2905.00'; opaque = NO; autoresize = RM+BM; userInteractionEnabled = NO; layer = <_UILabelLayer: 0x7f8f7bdbcf70>>
   | <UILabel: 0x7f8f7bdbd180; frame = (10 102; 26 16); text = '昨收'; opaque = NO; autoresize = RM+BM; userInteractionEnabled = NO; layer = <_UILabelLayer: 0x7f8f7bdbd380>>
   |    | <_UILabelContentLayer: 0x7f8f7e0c1640> (layer)
   | <UILabel: 0x7f8f7bdbd590; frame = (42 102; 51.5 16); text = '2905.00'; opaque = NO; autoresize = RM+BM; userInteractionEnabled = NO; layer = <_UILabelLayer: 0x7f8f7bdbd790>>
   | <UILabel: 0x7f8f7bdbd9a0; frame = (281.5 76; 26 16); text = '最高'; opaque = NO; autoresize = RM+BM; userInteractionEnabled = NO; layer = <_UILabelLayer: 0x7f8f7bdbdba0>>
   |    | <_UILabelContentLayer: 0x7f8f7e0c1ea0> (layer)
   | <UILabel: 0x7f8f7bdbddb0; frame = (313.5 76; 51.5 16); text = '2909.00'; opaque = NO; autoresize = RM+BM; userInteractionEnabled = NO; layer = <_UILabelLayer: 0x7f8f7bdbdfb0>>
   | <UILabel: 0x7f8f7bdbe1c0; frame = (281.5 102; 26 16); text = '最低'; opaque = NO; autoresize = RM+BM; userInteractionEnabled = NO; layer = <_UILabelLayer: 0x7f8f7bdbe3c0>>
   |    | <_UILabelContentLayer: 0x7f8f7e0c4e60> (layer)
   | <UILabel: 0x7f8f7bdbe5d0; frame = (313.5 102; 51.5 16); text = '2889.00'; opaque = NO; autoresize = RM+BM; userInteractionEnabled = NO; layer = <_UILabelLayer: 0x7f8f7bdbe7d0>>
   | <UIView: 0x7f8f7bdbe9e0; frame = (146 76; 83.5 42); autoresize = RM+BM; layer = <CALayer: 0x7f8f7bdbeb50>>
   |    | <UILabel: 0x7f8f7bdbeb70; frame = (0 0; 26 16); text = '买进'; opaque = NO; autoresize = RM+BM; userInteractionEnabled = NO; layer = <_UILabelLayer: 0x7f8f7bdbed70>>
   |    |    | <_UILabelContentLayer: 0x7f8f7e0c4e90> (layer)
   |    | <UILabel: 0x7f8f7bdbef80; frame = (0 26; 26 16); text = '卖出'; opaque = NO; autoresize = RM+BM; userInteractionEnabled = NO; layer = <_UILabelLayer: 0x7f8f7bdd5990>>
   |    |    | <_UILabelContentLayer: 0x7f8f7e0c4b70> (layer)
   |    | <UILabel: 0x7f8f7bdd5b80; frame = (32 0; 51.5 16); text = '2898.00'; opaque = NO; autoresize = RM+BM; userInteractionEnabled = NO; layer = <_UILabelLayer: 0x7f8f7bdd5d80>>
   |    | <UILabel: 0x7f8f7bdd5f90; frame = (32 26; 51.5 16); text = '2892.00'; opaque = NO; autoresize = RM+BM; userInteractionEnabled = NO; layer = <_UILabelLayer: 0x7f8f7bdd6190>>

And it's super view auto layout:

po [[0x7f8f7bdb92d0 superview] recursiveDescription]
<UIView: 0x7f8f7bdd8b70; frame = (0 0; 375 127); autoresize = RM+BM; layer = <CALayer: 0x7f8f7bdd8ce0>>
   | <MarketGoodsDetail: 0x7f8f7bdb92d0; frame = (0 0; 375 127); autoresize = RM+BM; userInteractionEnabled = NO; layer = <CALayer: 0x7f8f7bdb9760>>
   |    | <UILabel: 0x7f8f7bdb9b80; frame = (10 8.5; 37.5 12); text = '(广贵所)'; opaque = NO; autoresize = RM+BM; userInteractionEnabled = NO; layer = <_UILabelLayer: 0x7f8f7bdb9780>>
   |    |    | <_UILabelContentLayer: 0x7f8f7bfc4090> (layer)
   |    | <UILabel: 0x7f8f7bdba820; frame = (10 22.5; 121.5 36); text = '2892.00'; opaque = NO; autoresize = RM+BM; userInteractionEnabled = NO; layer = <_UILabelLayer: 0x7f8f7bdb9f10>>
   |    | <UILabel: 0x7f8f7bdbb460; frame = (237.5 35; 52.5 20.5); text = '-13.00'; opaque = NO; autoresize = RM+BM; userInteractionEnabled = NO; layer = <_UILabelLayer: 0x7f8f7bdbb660>>
   |    | <UILabel: 0x7f8f7bdbb9c0; frame = (307 35; 58 20.5); text = '-0.45%'; opaque = NO; autoresize = RM+BM; userInteractionEnabled = NO; layer = <_UILabelLayer: 0x7f8f7bdbbbc0>>
   |    | <UIView: 0x7f8f7bdbbe00; frame = (10 63.5; 355 0.5); autoresize = RM+BM; layer = <CALayer: 0x7f8f7bdbbf70>>
   |    | <UILabel: 0x7f8f7bdbc0b0; frame = (10 76; 26 16); text = '今开'; opaque = NO; autoresize = RM+BM; userInteractionEnabled = NO; layer = <_UILabelLayer: 0x7f8f7bdbc2b0>>
   |    |    | <_UILabelContentLayer: 0x7f8f7e0c2a90> (layer)
   |    | <UILabel: 0x7f8f7bdbcd70; frame = (42 76; 51.5 16); text = '2905.00'; opaque = NO; autoresize = RM+BM; userInteractionEnabled = NO; layer = <_UILabelLayer: 0x7f8f7bdbcf70>>
   |    | <UILabel: 0x7f8f7bdbd180; frame = (10 102; 26 16); text = '昨收'; opaque = NO; autoresize = RM+BM; userInteractionEnabled = NO; layer = <_UILabelLayer: 0x7f8f7bdbd380>>
   |    |    | <_UILabelContentLayer: 0x7f8f7e0c1640> (layer)
   |    | <UILabel: 0x7f8f7bdbd590; frame = (42 102; 51.5 16); text = '2905.00'; opaque = NO; autoresize = RM+BM; userInteractionEnabled = NO; layer = <_UILabelLayer: 0x7f8f7bdbd790>>
   |    | <UILabel: 0x7f8f7bdbd9a0; frame = (281.5 76; 26 16); text = '最高'; opaque = NO; autoresize = RM+BM; userInteractionEnabled = NO; layer = <_UILabelLayer: 0x7f8f7bdbdba0>>
   |    |    | <_UILabelContentLayer: 0x7f8f7e0c1ea0> (layer)
   |    | <UILabel: 0x7f8f7bdbddb0; frame = (313.5 76; 51.5 16); text = '2909.00'; opaque = NO; autoresize = RM+BM; userInteractionEnabled = NO; layer = <_UILabelLayer: 0x7f8f7bdbdfb0>>
   |    | <UILabel: 0x7f8f7bdbe1c0; frame = (281.5 102; 26 16); text = '最低'; opaque = NO; autoresize = RM+BM; userInteractionEnabled = NO; layer = <_UILabelLayer: 0x7f8f7bdbe3c0>>
   |    |    | <_UILabelContentLayer: 0x7f8f7e0c4e60> (layer)
   |    | <UILabel: 0x7f8f7bdbe5d0; frame = (313.5 102; 51.5 16); text = '2889.00'; opaque = NO; autoresize = RM+BM; userInteractionEnabled = NO; layer = <_UILabelLayer: 0x7f8f7bdbe7d0>>
   |    | <UIView: 0x7f8f7bdbe9e0; frame = (146 76; 83.5 42); autoresize = RM+BM; layer = <CALayer: 0x7f8f7bdbeb50>>
   |    |    | <UILabel: 0x7f8f7bdbeb70; frame = (0 0; 26 16); text = '买进'; opaque = NO; autoresize = RM+BM; userInteractionEnabled = NO; layer = <_UILabelLayer: 0x7f8f7bdbed70>>
   |    |    |    | <_UILabelContentLayer: 0x7f8f7e0c4e90> (layer)
   |    |    | <UILabel: 0x7f8f7bdbef80; frame = (0 26; 26 16); text = '卖出'; opaque = NO; autoresize = RM+BM; userInteractionEnabled = NO; layer = <_UILabelLayer: 0x7f8f7bdd5990>>
   |    |    |    | <_UILabelContentLayer: 0x7f8f7e0c4b70> (layer)
   |    |    | <UILabel: 0x7f8f7bdd5b80; frame = (32 0; 51.5 16); text = '2898.00'; opaque = NO; autoresize = RM+BM; userInteractionEnabled = NO; layer = <_UILabelLayer: 0x7f8f7bdd5d80>>
   |    |    | <UILabel: 0x7f8f7bdd5f90; frame = (32 26; 51.5 16); text = '2892.00'; opaque = NO; autoresize = RM+BM; userInteractionEnabled = NO; layer = <_UILabelLayer: 0x7f8f7bdd6190>>

Who can tell me which constraint caused this problem? Thanks for kindly help!!

Is the view presented correctly and you want the error to go away or is it not displayed in the manner you'd like? — beyowulf, Dec 04 '15 at 02:52
@beyowulf the view is presented looks correctly but reports that error message I posted, how to let the error go away? — Raymond Liao, Dec 04 '15 at 03:39
How are you hiding the table view you don't want to show? Are you setting it's width to 0 by chance? — Clay Garrett, Dec 04 '15 at 05:21
@kleezy no, I have a container View to put tableView in, I add in the tableView which I want it to show, and remove another one. I did not change any constraint of them when I add/remove. — Raymond Liao, Dec 04 '15 at 05:31

score 2 · Accepted Answer · edited May 23 '17 at 12:01

2

I think you want to set the priority of these constraints to 999:

"<NSLayoutConstraint:0x7f8f7bdd74b0 H:|-(10)-[UIView:0x7f8f7bdbbe00]   (Names: '|':MarketGoodsDetail:0x7f8f7bdb92d0 )>",
"<NSLayoutConstraint:0x7f8f7bdd7500 H:[UIView:0x7f8f7bdbbe00]-(10)-|   (Names: '|':MarketGoodsDetail:0x7f8f7bdb92d0 )>"

I believe those are conflicting with:

"<NSLayoutConstraint:0x7f8f7e0c6d90 'UIView-Encapsulated-Layout-Width' H:[UIView:0x7f8f7bdda860(0)]>"

Which specifies your container view's width is going to be 0 points. So it can't add the 10 point margins (which the two constraints above call for). Setting them to 999 should let them be overridden gracefully.

See What is a 'UIView-Encapsulated-Layout-Width' constraint? for more info.

edited May 23 '17 at 12:01

Community

1
1

answered Dec 04 '15 at 05:39

Clay Garrett

1,023
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How to set them priority to 999? In story board or code? – Raymond Liao Dec 04 '15 at 06:05
If you set your constraints up in the storyboard, then you can edit them there. You need to find a view that is a direct child of your MarketGoodsDetail view that has leading/trailing constraints set to 10. For each of them, click edit on the constraint and change the 1000 priority to 999. – Clay Garrett Dec 04 '15 at 06:09

iOS AutoLayout issue: Unable to simultaneously satisfy constraints

1 Answers1