UIView+BorderViews - A simple way to add a throwaway border view to a particular edge of a UIView

UIView+BorderViews.h

//
//  UIView+BorderViews.h
//  Cluster
//
//  Created by Rizwan Sattar on 4/1/14.
//  Copyright (c) 2014 Cluster Labs, Inc. All rights reserved.
//

#import <UIKit/UIKit.h>

@interface UIView (BorderViews)

- (UIView *) addBorderViewToEdge:(UIRectEdge)edge
                      borderSize:(CGFloat)borderSize
                     borderColor:(UIColor *)borderColor
                           inset:(CGFloat)inset;

@end

UIView+BorderViews.m

//
//  UIView+BorderViews.m
//  Cluster
//
//  Created by Rizwan Sattar on 4/1/14.
//  Copyright (c) 2014 Cluster Labs, Inc. All rights reserved.
//

#import "UIView+BorderViews.h"

@implementation UIView (BorderViews)

- (UIView *) addBorderViewToEdge:(UIRectEdge)edge
                      borderSize:(CGFloat)borderSize
                     borderColor:(UIColor *)borderColor
                           inset:(CGFloat)inset
{
    if (edge == UIRectEdgeAll || edge == UIRectEdgeNone) {
        return nil;
    }
    UIView *borderView = [[UIView alloc] initWithFrame:CGRectZero];
    borderView.backgroundColor = borderColor;
    CGRect bounds = self.bounds;
    CGRect frame = bounds;
    UIViewAutoresizing mask = UIViewAutoresizingNone;
    switch (edge) {
        case UIRectEdgeTop:
            frame.size.height = borderSize;
            frame.origin.y = inset;
            mask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleBottomMargin;
            break;
        case UIRectEdgeBottom:
            frame.size.height = borderSize;
            frame.origin.y = CGRectGetHeight(bounds)-CGRectGetHeight(frame)-inset;
            mask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleTopMargin;
            break;
        case UIRectEdgeLeft:
            frame.size.width = borderSize;
            frame.origin.y = inset;
            mask = UIViewAutoresizingFlexibleHeight | UIViewAutoresizingFlexibleRightMargin;
            break;
        case UIRectEdgeRight:
            frame.size.width = borderSize;
            frame.origin.x = CGRectGetWidth(bounds)-CGRectGetWidth(frame)-inset;
            mask = UIViewAutoresizingFlexibleHeight | UIViewAutoresizingFlexibleLeftMargin;
        default:
            break;
    }

    borderView.frame = frame;
    borderView.autoresizingMask = mask;

    //[self insertSubview:borderView atIndex:0];
    [self addSubview:borderView];
    return borderView;
}

@end