Negative spacer for UIBarButtonItem in navigation bar on iOS 11

Just a workaround for my case, it might be helpful to some people. I would like to achieve this:

and previously I was using the negativeSpacer as well. Now I figured out this solution:

        let logoImage = UIImage(named: "your_image")
        let logoImageView = UIImageView(image: logoImage)
        logoImageView.frame = CGRect(x: -16, y: 0, width: 150, height: 44)
        logoImageView.contentMode = .scaleAspectFit
        let logoView = UIView(frame: CGRect(x: 0, y: 0, width: 10, height: 44))
        **logoView.clipsToBounds = false**
        logoView.addSubview(logoImageView)
        let logoItem = UIBarButtonItem(customView: logoView)
        navigationItem.leftBarButtonItem = logoItem

Based on keithbhunter's answer I've created a custom UINavigationBar:

NavigationBarCustomMargins.h:

#import <UIKit/UIKit.h>

@interface NavigationBarCustomMargins : UINavigationBar

@property (nonatomic) IBInspectable CGFloat leftMargin;
@property (nonatomic) IBInspectable CGFloat rightMargin;

@end

NavigationBarCustomMargins.m:

#import "NavigationBarCustomMargins.h"

#define DefaultMargin 16
#define NegativeSpacerTag 87236223

@interface NavigationBarCustomMargins ()

@property (nonatomic) BOOL leftMarginIsSet;
@property (nonatomic) BOOL rightMarginIsSet;

@end

@implementation NavigationBarCustomMargins

@synthesize leftMargin = _leftMargin;
@synthesize rightMargin = _rightMargin;

- (void)layoutSubviews {
    [super layoutSubviews];

    if (([[[UIDevice currentDevice] systemVersion] compare:@"11.0" options:NSNumericSearch] != NSOrderedAscending)) {
        BOOL isRTL = [UIApplication sharedApplication].userInterfaceLayoutDirection == UIUserInterfaceLayoutDirectionRightToLeft;
        for (UIView *view in self.subviews) {
            view.layoutMargins = UIEdgeInsetsMake(0, isRTL ? self.rightMargin : self.leftMargin, 0, isRTL ? self.leftMargin : self.rightMargin);
        }
    } else {
        //left
        NSMutableArray *leftItems = [self.topItem.leftBarButtonItems mutableCopy];
        if (((UIBarButtonItem *)leftItems.firstObject).tag != NegativeSpacerTag) {

            UIBarButtonItem *negativeSpacer = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFixedSpace target:nil action:nil];
            negativeSpacer.tag = NegativeSpacerTag;
            negativeSpacer.width = self.leftMargin - DefaultMargin;
            [leftItems insertObject:negativeSpacer atIndex:0];

            [self.topItem setLeftBarButtonItems:[leftItems copy] animated:NO];
        }

        //right
        NSMutableArray *rightItems = [self.topItem.rightBarButtonItems mutableCopy];
        if (((UIBarButtonItem *)rightItems.firstObject).tag != NegativeSpacerTag) {

            UIBarButtonItem *negativeSpacer = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFixedSpace target:nil action:nil];
            negativeSpacer.tag = NegativeSpacerTag;
            negativeSpacer.width = self.rightMargin - DefaultMargin;
            [rightItems insertObject:negativeSpacer atIndex:0];
            [self.topItem setRightBarButtonItems:[rightItems copy] animated:NO];
        }
    }
}

- (CGFloat)leftMargin {
    if (_leftMarginIsSet) {
        return _leftMargin;
    }
    return DefaultMargin;
}

- (CGFloat)rightMargin {
    if (_rightMarginIsSet) {
        return _rightMargin;
    }
    return DefaultMargin;
}

- (void)setLeftMargin:(CGFloat)leftMargin {
    _leftMargin = leftMargin;
    _leftMarginIsSet = YES;
}

- (void)setRightMargin:(CGFloat)rightMargin {
    _rightMargin = rightMargin;
    _rightMarginIsSet = YES;
}

@end

After that I set custom class to my UINavigationController in Interface Builder and just set needed margins: Screenshot 1

Works fine. Supports RTL and iOS prior 11: Screenshot 2

Another way is that , you can wrapper your content to a offset view

class CustomBarItemView : UIView {
    
    var offsetContentView : UIView = UIView.init(frame: .zero)
    
    override init(frame: CGRect) {
        super.init(frame: frame)
        addSubview(offsetContentView)
        offsetContentView.snp.makeConstraints { make in
            make.edges.equalToSuperview().inset(UIEdgeInsets(top: 0, left: -8, bottom: 0, right: 0))
        }
        // implement add your content on offsetContentView
        // todo ...
    }
    
    required init?(coder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
}

because CustomBarItemView layer not use maskToBounds = true，so it looks like OK

let naviItem = UIBarButtonItem.init(customView: CustomBarItemView())

For me this answer help https://stackoverflow.com/a/44896832
In particular i've set both imageEdgeInsets and titleEdgeInsets because my button has image and title together