减少导航栏左右栏按钮项的左右空间

Question

I am adding two custom buttons on navigation bar. one at left and other at right. I am successfully done with it,

but I failed to reduce the space between the starting point and frame of buttons.

I tried a lot, also gave the negative value of x, still didn't helped. Here is the code for buttons

-(void)addLeftButton
{
    UIButton *aButton = [UIButton buttonWithType:UIButtonTypeCustom];
    aButton.backgroundColor = [UIColor redColor];
    [aButton setTitle:@"H" forState:UIControlStateNormal];
    aButton.frame = CGRectMake(0.0, 0.0, 40, 40);
    [aButton setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
    UIBarButtonItem *aBarButtonItem = [[UIBarButtonItem alloc] initWithCustomView:aButton];
    [aButton addTarget:self action:@selector(backBtnClicked:) forControlEvents:UIControlEventTouchUpInside];
    [self.navigationItem setLeftBarButtonItem:aBarButtonItem];
}

-(void)addRightButton
{
    UIButton *aButton = [UIButton buttonWithType:UIButtonTypeCustom];
    aButton.backgroundColor = [UIColor greenColor];
    [aButton setTitle:@"B" forState:UIControlStateNormal];
    aButton.frame = CGRectMake(0.0, 0.0, 40, 40);
    [aButton setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
    UIBarButtonItem *aBarButtonItem = [[UIBarButtonItem alloc] initWithCustomView:aButton];
    [aButton addTarget:self action:@selector(backBtnClicked:) forControlEvents:UIControlEventTouchUpInside];
    [self.navigationItem setRightBarButtonItem:aBarButtonItem];
}

Also tried using

aBarButtonItem.width = -16;

but didn't helped.

How to achieve this...? Thanks in advance...

These are the some links that I preferred but didn't helped much How to Edit Empty Spaces of Left, Right UIBarButtonItem in UINavigationBar [iOS 7]

How to Edit Empty Spaces of Left, Right UIBarButtonItem in UINavigationBar [iOS 7]

Answer 1

UIBarButtonItem *negativeSpacer = [[UIBarButtonItem alloc]
                                                           initWithBarButtonSystemItem:UIBarButtonSystemItemFixedSpace
                                                           target:nil action:nil];
    negativeSpacer.width = -16;
    [self.navigationItem setLeftBarButtonItems:[NSArray arrayWithObjects:negativeSpacer,yourbutton, nil] animated:YES];

Use like that.

Answer 2

Here's a Swift version:

let negativeSpacer = UIBarButtonItem()
negativeSpacer.width = -16

let hamburgerButton = UIBarButtonItem(image: UIImage(named: "hamburgerMenu")?.withRenderingMode(.alwaysOriginal),
                                              style: .plain,
                                              target: self,
                                              action: #selector(menuButtonPressed))

navigationItem.setLeftBarButtonItems([negativeSpacer, hamburgerButton], animated: true)