Because the cell's content height was set to be explicitly zero in heightForRowAtIndexPath, Auto Layout freaks out when it sees that a required height constraint of 17 is set on "view code" (this applies to any element with an explicit height constraint and not a relative one)
Implementation
Make any vertically-related constraints have a "High" priority instead of "Required".
Diagnosis
Because the cell's content height was set to be explicitly zero in
heightForRowAtIndexPath, Auto Layout freaks out when it sees that a required height constraint of 17 is set on "view code" (this applies to any element with an explicit height constraint and not a relative one)Implementation
Make any vertically-related constraints have a "High" priority instead of "Required".
References issue #14