MASConstraint+Private.h
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//
// MASConstraint+Private.h
// Masonry
//
// Created by Nick Tymchenko on 29/04/14.
// Copyright (c) 2014 cloudling. All rights reserved.
//
#import "MASConstraint.h"
@protocol MASConstraintDelegate;
@interface MASConstraint ()
/**
* Whether or not to check for an existing constraint instead of adding constraint
*/
@property (nonatomic, assign) BOOL updateExisting;
/**
* Usually MASConstraintMaker but could be a parent MASConstraint
*/
@property (nonatomic, weak) id<MASConstraintDelegate> delegate;
/**
* Based on a provided value type, is equal to calling:
* NSNumber - setOffset:
* NSValue with CGPoint - setPointOffset:
* NSValue with CGSize - setSizeOffset:
* NSValue with MASEdgeInsets - setInsets:
*/
- (void)setLayoutConstantWithValue:(NSValue *)value;
@end
@interface MASConstraint (Abstract)
/**
* Sets the constraint relation to given NSLayoutRelation
* returns a block which accepts one of the following:
* MASViewAttribute, UIView, NSValue, NSArray
* see readme for more details.
*/
- (MASConstraint * (^)(id, NSLayoutRelation))equalToWithRelation;
/**
* Override to set a custom chaining behaviour
*/
- (MASConstraint *)addConstraintWithLayoutAttribute:(NSLayoutAttribute)layoutAttribute;
@end
@protocol MASConstraintDelegate <NSObject>
/**
* Notifies the delegate when the constraint needs to be replaced with another constraint. For example
* A MASViewConstraint may turn into a MASCompositeConstraint when an array is passed to one of the equality blocks
*/
- (void)constraint:(MASConstraint *)constraint shouldBeReplacedWithConstraint:(MASConstraint *)replacementConstraint;
- (MASConstraint *)constraint:(MASConstraint *)constraint addConstraintWithLayoutAttribute:(NSLayoutAttribute)layoutAttribute;
@end