如何删除 NavigationBar 的右空间？

Question

我正在玩导航栏按钮，我需要一个右边缘的按钮，空间为 0，在谷歌搜索后我发现下面的代码

 self.filterButton = [[UIButton alloc] initWithFrame:CGRectMake(0, 0, 80, 45)];
[self.filterButton setBackgroundColor:[UIColor redColor]];
UIImage *buttnImage=[UIImage imageNamed:@"chemistry-filter"];
[self.filterButton setImage:buttnImage forState:UIControlStateNormal];
[self.filterButton addTarget:self action:@selector(filterAction:) forControlEvents:UIControlEventTouchUpInside];
UIBarButtonItem *btn2 = [[UIBarButtonItem alloc] initWithCustomView:self.filterButton];

UIBarButtonItem *negativeSpacer = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFixedSpace target:nil action:nil];
negativeSpacer.width = -25;
[self.navigationItem setRightBarButtonItems:[NSArray arrayWithObjects:negativeSpacer,btn2, nil] animated:YES];

但不幸的是，在 iOS 13 中，negativeSpacer 不起作用。任何人都可以建议我解决方案。

这里附上截图 谢谢。

Answer 1

让我们试试这个简单的方法，让我们将空间 BarButtonItem 的宽度定义为 self.view.frame.size.width - width of the button 的宽度。

self.filterButton = [[UIButton alloc] initWithFrame:CGRectMake(0, 0, 80, 45)];
[self.filterButton setBackgroundColor:[UIColor redColor]];
UIImage *buttnImage=[UIImage imageNamed:@"chemistry-filter"];
[self.filterButton setImage:buttnImage forState:UIControlStateNormal];
[self.filterButton addTarget:self action:@selector(filterAction:) 
forControlEvents:UIControlEventTouchUpInside];
UIBarButtonItem *btn2 = [[UIBarButtonItem alloc] 
initWithCustomView:self.filterButton];

UIBarButtonItem *negativeSpacer = [[UIBarButtonItem alloc] 
initWithBarButtonSystemItem:UIBarButtonSystemItemFixedSpace target:nil 
action:nil];
negativeSpacer.width = self.view.frame.size.width - 45; // As 45 is the frame width of your filter button 
[self.navigationItem setRightBarButtonItems:[NSArray 
arrayWithObjects:negativeSpacer,btn2, nil] animated:YES];

希望这会有所帮助！