Change Auto Constraint height of UIView

Question

I have a UIView in a UITableViewCell. in the view, I have a UITextView and a UIView. They are both auto constraint on all 4 sides.

The UIView has a height constraint. I would like to update the height constraint prorrammatically. I made a outlet of the height constraint so I can change it.

Here is my code:

CGRect frame = self.myView.frame;
frame.size.height = 50;
frame.size.width = self.myView.frame.size.width;
self.myView.frame = frame;
self.viewHeight.constant = 50;

[myTableView reloadData];

When I run this code, it works perfectly, but I get an error: (I'm pretty new to objective c, so I don't understand what it's trying to say.)

2015-01-26 15:25:43.408 myApp[1449:55334] 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. (Note: If you're seeing NSAutoresizingMaskLayoutConstraints that you don't understand, refer to the documentation for the UIView property translatesAutoresizingMaskIntoConstraints) 

(

    "<NSLayoutConstraint:0x7fb07853ac20 V:[UIView:0x7fb0784dbb80(50)]>",

    "<NSLayoutConstraint:0x7fb0785bd170 V:|-(0)-[UITextView:0x7fb07896de00]   (Names: '|':UIView:0x7fb07857fb70 )>",

    "<NSLayoutConstraint:0x7fb0785bd260 V:[UITextView:0x7fb07896de00]-(3)-[UIView:0x7fb0784dbb80]>",

    "<NSLayoutConstraint:0x7fb0785bd350 V:[UIView:0x7fb0784dbb80]-(0)-|   (Names: '|':UIView:0x7fb07857fb70 )>",

    "<NSLayoutConstraint:0x7fb0785bd5b0 UILabel:0x7fb0785150f0'info:'.top == UITableViewCellContentView:0x7fb078581400.topMargin>",

    "<NSLayoutConstraint:0x7fb0785bd650 UITableViewCellContentView:0x7fb078581400.bottomMargin == UIView:0x7fb07857fb70.bottom + 1>",

    "<NSLayoutConstraint:0x7fb0785bd6f0 V:[UILabel:0x7fb0785150f0'info:']-(8)-[UIView:0x7fb07857fb70]>",

    "<NSLayoutConstraint:0x7fb078704f20 'UIView-Encapsulated-Layout-Height' V:[UITableViewCellContentView:0x7fb078581400(77)]>"

)



Will attempt to recover by breaking constraint 

<NSLayoutConstraint:0x7fb07853ac20 V:[UIView:0x7fb0784dbb80(50)]>



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.

"Unable to simultaneously satisfy constraints." It means that the autolayout system is not able to meet your constraints because the constraints contain conflicts. Try to examine your constraints code — taocp, Jan 26 '15 at 23:49
All other constraints are made in the storyboard and there are no errors there — , Jan 26 '15 at 23:50

score 0 · Accepted Answer · answered Jan 27 '15 at 00:28

0

You programmaticlly change the height constraint to 50. It is unsatisfied with UIView-Encapsulated-Layout-Height constraint(77), which is set by iOS for UITableViewCellContentView.

answered Jan 27 '15 at 00:28

ljk321

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In heightForRowAtIndexPth my return statement is as follows: return txtView.frame.size.height + self.myView.frame.size.height + 44 - 0.5; – Jan 27 '15 at 00:55
@MikeRally Is `txtView.frame.size.height + self.myView.frame.size.height + 44 - 0.5` suppose to be exactly `50` ? Anyway, I don't recommand mixing up storyboard constraints and programmaticlly set constraints. It tends to cause many unexpected problems. – ljk321 Jan 27 '15 at 01:12
no. self.myView.frame.size.height is 50. I don't usually do it, but I had to assign a height to myView in the storyboard, and I'm trying to change the height programamtically. – Jan 27 '15 at 01:15
@MikeRally To remove the warning, you can try to remove previous constraint before assigning a new one. This answer http://stackoverflow.com/a/27621707/3562486 may be helpful. – ljk321 Jan 27 '15 at 01:19

Change Auto Constraint height of UIView

1 Answers1