如何删除UIBarButtonItem旁边的填充

Question

我在导航栏的自定义右键栏项目中添加了一个自定义按钮，如图所示。

我希望能够删除按钮后的空格，使其触及屏幕的右边缘，但即使搜索后也无法找到解决方案。如果有人能提到怎么样，会很棒。

这是我正在使用的代码

UIButton *aButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];    
aButton.frame = CGRectMake(50.0, 0.0, 60, 44);
UIBarButtonItem *aBarButtonItem = [[UIBarButtonItem alloc] initWithCustomView:aButton];
[aButton addTarget:self action:@selector(testButtonControl:) forControlEvents:UIControlEventTouchUpInside];

self.navigationItem.rightBarButtonItem = aBarButtonItem;

Answer 1

你可以添加一个负宽度的固定空间元素（我知道，这听起来像一个黑客，但它有效）：

UIButton *aButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];    
aButton.frame = CGRectMake(50.0, 0.0, 60, 44);
UIBarButtonItem *aBarButtonItem = [[UIBarButtonItem alloc] initWithCustomView:aButton];
[aButton addTarget:self action:@selector(testButtonControl:) forControlEvents:UIControlEventTouchUpInside];

UIBarButtonItem *spaceFix = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFixedSpace target:nil action:NULL];
spaceFix.width = -5;

self.navigationItem.rightBarButtonItems = @[spaceFix, aBarButtonItem];

Answer 2

您必须创建一个新视图，添加按钮以及您想要的所有其他内容，并将其添加到titleView中，如图所示。

- (void)viewDidLoad {
    self.navigationItem.titleView = [self titleView];
}

- (UIView *)titleView {
    CGFloat navBarHeight = self.navigationController.navigationBar.frame.size.height;
    CGFloat width = 0.95 * self.view.frame.size.width;
    UIView *containerView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, width, navBarHeight)];
..
// please add what you need here
....
}

Answer 3

除非您继承UINavigationBar或通过类别覆盖其方法，否则不能。

Answer 4

您可以通过添加UIView然后在其中添加x = spaceWidth y = 0的按钮来执行此操作。

查看以下代码中的正确项目（这是在UINavigationItem类别中）

1 -

UIView *_rightView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 44, 44)]; [_rightView setBackgroundColor:[UIColor purpleColor]];//debug color

2-

    UIButton *aLeftButton = [[UIButton alloc] init];

   //...//

    aLeftButton.frame = CGRectMake(-15, 0, 44, 44);//in your case +15
    [aLeftButton setBackgroundImage:[UIImage imageNamed:buttonName] forState:UIControlStateNormal];
    [aLeftButton setBackgroundImage:[UIImage imageNamed:[buttonName stringByAppendingString:@"Selected"]] forState:UIControlStateSelected];
    [aLeftButton setAdjustsImageWhenDisabled:NO];
    [aLeftButton setAdjustsImageWhenHighlighted:NO];

    [aLeftButton addTarget:theSender action:aSelector forControlEvents:UIControlEventTouchUpInside];
    [_rightView addSubview:aLeftButton];
    UIBarButtonItem *aBarButton = [[UIBarButtonItem alloc] initWithCustomView:_rightView];
    [leftBarButtonsItem addObject:aBarButton];`

3

self.leftBarButtonItem = leftBarButtonsItem;