Debugging Your Constraints
The most common problems you encounter when adding constraints programmatically are ambiguous and unsatisfiable layouts. Expect to spend a lot of time at the Xcode debugging console and don’t be surprised when you see a large dump of information that starts with the phrase “Unable to simultaneously satisfy constraints.”
iOS does its best at runtime to let you know which constraints could not be satisfied and which constraints it has to break in order to proceed. Often, it suggests a list of constraints that you should evaluate to see which item is causing the problem. This usually looks something like this:
Probably at least one of the constraints in the following list is one you don't ...
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