text: //
  //  NSLayoutConstraint+KVConstraintExtensions.h
  //  https://github.com/keshavvishwkarma/KVConstraintExtensionsMaster.git
  //
  //  Distributed under the MIT License.
  //
  //  Copyright (c) 2015 Keshav Vishwkarma
  //
  //  Permission is hereby granted, free of charge, to any person obtaining a copy of
  //  this software and associated documentation files (the "Software"), to deal in
  //  the Software without restriction, including without limitation the rights to
  //  use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
  //  of the Software, and to permit persons to whom the Software is furnished to do
  //  so, subject to the following conditions:
  //
  //  The above copyright notice and this permission notice shall be included in all
  //  copies or substantial portions of the Software.
  //
  //  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  //  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  //  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  //  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  //  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  //  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  //  SOFTWARE.
  //
  
  #import <UIKit/UIKit.h>
  
  @interface NSLayoutConstraint (KVConstraintExtensions)
  
  UIKIT_EXTERN const CGFloat defaultMultiplier;
  UIKIT_EXTERN const CGFloat defaultConstant;
  UIKIT_EXTERN const NSLayoutRelation defaultRelation;
  UIKIT_EXTERN const CGFloat defaultLessMaxPriority;
  UIKIT_EXTERN const CGFloat default_iPadRatio;
  
  + (CGFloat)defaultSpacingBetweenSiblings;
  + (CGFloat)defaultSpacingBetweenSuperview;
  + (BOOL)recognizedDirectionByAttribute:(NSLayoutAttribute)attribute toAttribute:(NSLayoutAttribute)toTttribute;
  /** This method is used to trace the allready added constraints on receiver view
   */
  + (NSLayoutConstraint *)appliedConstraintForView:(UIView*)aView attribute:(NSLayoutAttribute)attribute;
  + (BOOL)isSelfConstraintAttribute:(NSLayoutAttribute)attribute;
  - (BOOL)isEqualToConstraint:(NSLayoutConstraint *)aConstraint;
  - (NSLayoutConstraint *)swapConstraintItems;
  - (NSLayoutConstraint *)modifyConstraintRelatedBy:(NSLayoutRelation)relation;
  - (NSLayoutConstraint *)modifyConstraintMultiplierBy:(CGFloat)multiplier;
  
  @end
  
  @interface NSArray (KV_ContainsConstraint)
  
  - (NSLayoutConstraint *)containsAppliedConstraint:(NSLayoutConstraint *)appliedConstraint;
  
  @end
  