Getting error when adding constraint

Question

I'm trying to set a constraint on 2 views so that they touch each other like this:

enter image description here

I tried setting constraints programmatically:

[self addConstraint:[NSLayoutConstraint constraintsWithVisualFormat:@"[_firstView][_secondView]" options:0 metrics:nil views:NSDictionaryOfVariableBindings(_firstView, _secondView)]];

But I get the following warning:

Incompatible pointer types sending 'NSArray *' to parameter of type 'NSLayoutConstraint'

What am I doing wrong?

nhgrif · Accepted Answer · 2015-06-04 02:25:43Z

2

The addConstraint: method expect a single constraint, however the constraintsWithVisualFormat: returns an NSArray of zero or more constraints.

Try adding an s.

[self addConstraints:/*your NSLayoutConstraint constraintsWithVisualFormat: call */];

Apple's naming conventions can usually help you out here. Notice that constraintsWithVisualFormat is plural while addConstraint: was singular (and addConstraints: is plural). Use these as your clue in the future.

answered Jun 4, 2015 at 2:25

nhgrif

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1 Comment

Eric Over a year ago

Oh! Thanks!! And just to make sure, the constraint I have will do I the image shows? Meaning flush the 2 views top to bottom?

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