Unable to simultaneously satisfy constraints, will attempt to recover by breaking constraint

I would recommend to debug and find which constraint is "the one you don't want". Suppose you have following issue:

Always the problem is how to find following Constraints and Views.

There are two solutions how to do this:

1. DEBUG VIEW HIERARCHY (Do not recommend this way)

Since you know where to find unexpected constraints (PBOUserWorkDayHeaderView) there is a way to do this fairly well. Lets find UIView and NSLayoutConstraint in red rectangles. Since we know their id in memory it is quite easy.

• Stop app using Debug View Hierarchy:

• Find the proper UIView:

• The next is to find NSLayoutConstraint we care about:

As you can see, the memory pointers are the same. So we know what is going on now. Additionally you can find NSLayoutConstraint in view hierarchy. Since it is selected in View, it selected in Navigator also.

If you need you may also print it on console using address pointer:

(lldb) po 0x17dce920<UIView: 0x17dce920; frame = (10 30; 300 24.5); autoresize = RM+BM; layer = <CALayer: 0x17dce9b0>>

You can do the same for every constraint the debugger will point to you:-) Now you decide what to do with this.

2. PRINT IT BETTER (I really recommend this way, this is of Xcode 7)

   • set unique identifier for every constraint in your view:

• create simple extension for NSLayoutConstraint:

SWIFT:

extension NSLayoutConstraint {    override public var description: String {        let id = identifier ?? ""        return "id: \(id), constant: \(constant)" //you may print whatever you want here    }}

OBJECTIVE-C

@interface NSLayoutConstraint (Description)@end@implementation NSLayoutConstraint (Description)-(NSString *)description {    return [NSString stringWithFormat:@"id: %@, constant: %f", self.identifier, self.constant];}@end

• build it once again, and now you have more readable output for you:

• once you got your id you can simple tap it in your Find Navigator:

• and quickly find it:

HOW TO SIMPLE FIX THAT CASE?

• try to change priority to 999 for broken constraint.

The problem you're having is the NSAutoresizingMaskLayoutConstraints should not be in there. This is the old system of springs and struts. To get rid of it, run this method on each view that you're wanting to constrain:

[view setTranslatesAutoresizingMaskIntoConstraints:NO];

Be careful, that you do not use more than one constraint in the same direction and type.

For example:Vertical constraint for trailing = 15 and another one is >= 10.

Sometimes, Xcode creates some constraints you don't notice.You have to get rid of redundant constraints and the log warning will surely disappear.

Additionaly, you can read and detect some certain reasons, directly from the log:

NSLayoutConstraint:0xa338390 V:|-(15)-[UILabel:0xa331260] (Names: '|':UILabel:0xa330270 )>

This we can read as problem in UILabel constraint, it is leading vertical constraint being 15pt long.

NSLayoutConstraint:0x859ab20 H:-(13)-|[UIView:0x85a8fb0]...

This would be trailing horizontal constraint etc.