Add border to UIButton on Xcode Interface Builder

MyButtonForInterfaceBuilder

//
//  MyButton.h

#import <UIKit/UIKit.h>

IB_DESIGNABLE

@interface MyButton : UIButton

@property (nonatomic, weak) IBInspectable UIColor *borderColor;
@property (nonatomic, assign) IBInspectable CGFloat borderWidth;
@end


// ------------------------------------------------------------------
//  MyButton.m

#import "MyButton.h"

@implementation MyButton

- (instancetype)initWithFrame:(CGRect)frame
{
    if (!(self = [super initWithFrame:frame])) return self;
    self.borderColor = [UIColor blackColor];
    self.borderWidth = 1;
    return self;
}

- (void)awakeFromNib
{
    [super awakeFromNib];
    self.layer.borderColor = self.borderColor.CGColor;
    self.layer.borderWidth = self.borderWidth;
}

- (void)setBorderColor:(UIColor *)borderColor
{
    _borderColor = borderColor;
    self.layer.borderColor = self.borderColor.CGColor;
}

- (void)setBorderWidth:(CGFloat)borderWidth
{
    _borderWidth = borderWidth;
    self.layer.borderWidth = self.borderWidth;
}

@end