从导航栏左右栏按钮项减少左侧空间和右侧空间

Question

我在导航栏上添加了两个自定义按钮。一个在左边，另一个在右边。我成功完成了它，

但是我没有减少按钮起点和框架之间的空间。

我尝试了很多，也给了x的负值，仍然没有帮助。这是按钮的代码

-(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];
}

也试过用

aBarButtonItem.width = -16;

但没有帮助。

如何实现这个......？提前致谢...

这些是我喜欢的一些链接，但没有帮助太多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];

就这样使用。

Answer 2

这是一个Swift版本：

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)