Constraints-helper 0.0.1

You want to add pod 'Constraints-helper', '~> 0.0' similar to the following to your Podfile:

target 'MyApp' do
  pod 'Constraints-helper', '~> 0.0'
end

Then run a pod install inside your terminal, or from CocoaPods.app.

Alternatively to give it a test run, run the command:

pod try Constraints-helper

Constraints-helper 0.0.1

By
Simon Westerlund
wesslansimon

I got tired of repeatedly writing the same attributes over and over again, so I wrote a small category to help me.

Usage

These three lines of code

[someView addConstraint:[NSLayoutConstraint wes_constraintWithItem:anotherView
                                                         attribute:NSLayoutAttributeWidth
                                                            toItem:someView]];

is equivalent to

[someView addConstraint:[NSLayoutConstraint constraintWithItem:anotherView
                                                     attribute:NSLayoutAttributeWidth
                                                     relatedBy:NSLayoutRelationEqual
                                                        toItem:someView
                                                     attribute:NSLayoutAttributeWidth
                                                    multiplier:1.0f
                                                      constant:0.0f]];

in which you can see, it’s a lot of repeating values. You're welcome.

And you can even do this

[someView addConstraints:[NSLayoutConstraint wes_constraintWithItem:anotherView
                                                         size:CGSizeMake(100, 50)]];

which is equivalent to

[someView addConstraint:[NSLayoutConstraint constraintWithItem:anotherView
                                                     attribute:NSLayoutAttributeWidth
                                                     relatedBy:NSLayoutRelationEqual
                                                        toItem:nil
                                                     attribute:NSLayoutAttributeNotAnAttribute
                                                    multiplier:1.0f
                                                      constant:100.0f]];

[someView addConstraint:[NSLayoutConstraint constraintWithItem:anotherView
                                                     attribute:NSLayoutAttributeHeight
                                                     relatedBy:NSLayoutRelationEqual
                                                        toItem:nil
                                                     attribute:NSLayoutAttributeNotAnAttribute
                                                    multiplier:1.0f
                                                      constant:50.0f]];

pretty neat huh?

As you can see, I only stripped some properties and attributes that are often left blank.

What else is there?

Well, here are all the available helpers:

/// Returns an array of constraints to set up a view's size
+ (NSArray *)wes_constraintWithItem:(id)view1 size:(CGSize)size;

/// Returns a constraint with two views that will use have the same relation with that specific attribute
+ (instancetype)wes_constraintWithItem:(id)view1 attribute:(NSLayoutAttribute)attr1 toItem:(id)view2;

/// Returns a constraint with two views that will use have the same relation with that specific attribute, however you can now set the constant
+ (instancetype)wes_constraintWithItem:(id)view1 attribute:(NSLayoutAttribute)attr1 toItem:(id)view2 constant:(CGFloat)c;

/// Returns a constraint with two views that will use the equal relation, however, you're free to set two different attributes and a constant
+ (instancetype)wes_constraintWithItem:(id)view1 attribute:(NSLayoutAttribute)attr1 toItem:(id)view2 attribute:(NSLayoutAttribute)attr2 constant:(CGFloat)c;

You can find me on twitter, @wesslansimon.