Layout fix: labels doesn't need constraints on booth sides.

[RealBonus]

Labels requires only one horizontal and one vertical constraint.
Try replace textview's bottom constraint with height constraint, and IB will generate warning. Removing tail and bottom constraints will fix that.

[MoZhouqi]

It seems to be a duplicate of #13.

[RealBonus]

#13 removes width constraint. We can also remove trailing constraint. With trailing, but without width constraints Xcode will generate warning if TextView has it own height constraint, instead of bottom.

[MoZhouqi]

As discussed in #13, in order to ensure the textAlignment property works properly, the trailing and width constraints of placeholderLabel are needed.

The console outputs the warning message which is almost because you forget to set the translatesAutoresizingMaskIntoConstraints property of the placeholderTextView to false.

[MoZhouqi]

Fixed in d670bb3.