Adaptation for iOS11 NavagitonBar with Objective-C

NSObject+Tracker.h
NSObject+Tracker.m
UINavigationItem+Tracker.h
UINavigationItem+Tracker.m

You need to change revise two parameters in UINavigationItem+Tracker.m:

static CGFloat margin = 5.0;
static CGFloat space = 1.0;

margin: The distance of the _UIButtonBarStackView to the leading or trailing of NavigationBar; space:The distance of the BarButtonItems in _UIButtonBarStackView;

NSObject+Tracker.h
NSObject+Tracker.m
UIView+Tracker.h
UIView+Tracker.m

You need to change revise two parameters in UINavigationItem+Tracker.m:

static CGFloat margin = 5.0;
static CGFloat space = 1.0;

margin: The distance of the _UIButtonBarStackView to the leading or trailing of NavigationBar; space:The distance of the BarButtonItems in _UIButtonBarStackView;