NSLayoutConstraint with UIScreen scaling. Comes useful for a the thin separator views to be a 1px width on any screen

gistfile1.txt

import UIKit

class ScalingConstraint: NSLayoutConstraint {
    override var constant: CGFloat {
        get {
            return super.constant / UIScreen.mainScreen().scale
        }
        set {
            super.constant = newValue
        }
    }
}

ScalingConstraint.m

#import <UIKit/UIKit.h>

/// Allows to use a 1px wide delimiter views
@interface ScalingConstraint : NSLayoutConstraint
@end

@implementation ScalingConstraint
- (CGFloat)constant {
	return [super constant] / [UIScreen mainScreen].scale;
}
@end