CODEWITHSUNDEEP
iosswiftswift2nslayoutconstraint
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Reputation: 5822

Cannot convert value of type '[NSLayoutConstraint]' error in swift 2

I want to add constraint to the UIImageView by adding this line of code:

addConstraint(NSLayoutConstraint.constraintsWithVisualFormat("H:|[v0]|", options: NSLayoutFormatOptions(), metrics: nil, views: ["v0": userProfileImageView]))

But xcode show me this error:

enter image description here

How I can fix this error?

Upvotes: 13

Views: 6613

Answers (2)

James P
James P

Reputation: 4836

Use addConstraints, instead of addConstraint. constraintsWithVisualFormat returns an array.

Your code becomes:

addConstraints(NSLayoutConstraint.constraintsWithVisualFormat("H:|[v0]|", options: [], metrics: nil, views: ["v0": userProfileImageView])

Upvotes: 36

mfaani
mfaani

Reputation: 36277

let horizontalprofileViewConstraint = NSLayoutConstraint.constraintsWithVisualFormat("H:|[v0]|", options: NSLayoutFormatOptions(), metrics: nil, views: ["v0": userProfileImageView]

If you click option and hover over horizontalprofileViewConstraint you will see its type as [NSLayoutConstraint] which is already an array.

So what you can do is:

view.addConstraints(horizontalprofileViewConstraint)

if you have more than one view then you cand do:

view.addConstraints(horizontalprofileViewConstraint + verticalprofileViewConstraint)

The + joins to arrays for you.

Upvotes: 2

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