Setting a constraint in Auto Layout

Question

I'm trying to set a constraint in Auto Layout.

This:

self.myHeightConstraint = 0.0f;

gives me this error:

Assigning to 'NSLayoutConstraint *' from incompatible type 'float'

Setting it to 0 gives no errors but I'm not sure if that's doing what I want it to do. Basically I want to set the height of an item in the View to 0.

Looking at the docs I see this on creating a Constraint:

+ (NSArray *)constraintsWithVisualFormat:(NSString *)format
                             options:(NSLayoutFormatOptions)opts
                             metrics:(NSDictionary *)metrics
                               views:(NSDictionary *)views

but not sure how I'd use it.

malex · Accepted Answer · 2015-05-02 01:07:27Z

1

You need to set constant for your height constraint to zero, but not the constraint itself.

The error exactly means that you try to assign float value to the constraint object.

Try

self.myHeightConstraint.constant = 0.0f;

answered May 2, 2015 at 1:07

malex

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