CODEWITHSUNDEEP
iosautolayoutconstraints
FatalError
FatalError

Reputation: 584

How to set self view height using constraints?

So I have been moving parts of the code to use constraints rather than the older way of doing things using frames. This is the current code that I need to move. I need to change the height of the view when I hide\unhide the tabbar below when the user presses a button.

CGRect newFrame = self.view.frame;
newFrame.size.height += 44
self.view.frame = newFrame;

self.view is the UIViewController. I want to set the height of the view shown in the picture. There is no way to add a height constraint to it (you can set it on the subviews though easily which i dont want)Selected View whose height needs to be set using constraints

I don't see a way of setting the self view height using constraints.

thanks arpit

Upvotes: 0

Views: 797

Answers (1)

Julian
Julian

Reputation: 9337

This short tutorial will be helpful for you.

You can do it using VFL (I personally prefer, see link above) or by this kind of code:

[yourView addConstraint:[NSLayoutConstraint constraintWithItem:yourView    
                                                     attribute:NSLayoutAttributeHeight
                                                     relatedBy:0 
                                                        toItem:nil
                                                     attribute:NSLayoutAttributeNotAnAttribute 
                                                    multiplier:1 
                                                      constant:requiredHeight]];

This piece of code will add a constraint on height for yourView specified by requiredHeight. Before start coding please take a look at intrinsicContentSize and updateConstraints methods.

When setting constraints please remember to firstly set (for a view you will set constraints) translatesAutoresizingMaskIntoConstraints flag to NO (it is set to YES by default). Also reading this should put some light on the topic.

Upvotes: 1

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