CODEWITHSUNDEEP
iphoneios7xcode5
user1120133
user1120133

Reputation: 3234

[NSLayoutConstraint constraintWithItem:attribute:relatedBy:toItem:attribute:multiplier:constant:]: Constraint must contain a first layout item'

i added this piece of code in viewdidload method to Add the Vertical Space Constraint to the top-most view

as based on apple Technical Q&A QA1797 Preventing the Status Bar from Covering Your Views

 [NSLayoutConstraint constraintWithItem:self.toolbar1
                             attribute:NSLayoutAttributeTop
                             relatedBy:NSLayoutRelationEqual
                                toItem:self.topLayoutGuide
                             attribute:NSLayoutAttributeBaseline
                            multiplier:1.0
                              constant:0.0];

but it crashes app and shows this error NSInvalidArgumentException', reason: '[NSLayoutConstraint constraintWithItem:attribute:relatedBy:toItem:attribute:multiplier:constant:]: Constraint must contain a first layout item'

Any clues why i m getting this error and how this can be fixed.

Thanks for help.

Upvotes: 1

Views: 5522

Answers (2)

LMVogel
LMVogel

Reputation: 779

This happens when you are setting up UI code in your init method, when your views are not created yet. Try moving your code to the viewDidLoad method and see if it works.

Upvotes: 1

mpprdev
mpprdev

Reputation: 1283

This error occurs if both items are nil. Most likely your first item 'self.toolbar1' is nil.

Upvotes: 4

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