iOS 7 UIBarButtonItem 荒谬的间距问题

Question

我遇到了一个到目前为止我找不到解决方案的问题。我正在向我的应用程序添加一个新功能，并希望在我的 UINavigationBar 的左侧添加第二个 UIBarButtonItem。出于某种原因，iOS 7 将其视为 button1、grandCanyon、button2。我找不到任何方法来消除这两个按钮之间荒谬的间距，这也导致我的标题不对齐。谁能帮忙！？有解决办法吗！？

代码：

UIBarButtonItem *firstButton = [[UIBarButtonItem alloc] initWithImage:[UIImage imageNamed:@"firstButton"] style:UIBarButtonItemStylePlain target:self action:@selector(showSettings)];
UIBarButtonItem *secondButton = [[UIBarButtonItem alloc] initWithImage:[UIImage imageNamed:@"secondButton"] style:UIBarButtonItemStylePlain target:self action:@selector(showAttachments)];
[self.navigationItem setLeftBarButtonItems:[NSArray arrayWithObjects:firstButton, secondButton, nil]];

Answer 1

认为我已经设法使用如下所示的自定义视图解决了问题，它并不完美（例如，选择使按钮变暗而不是变亮）但我明天会尝试解决这个问题。很高兴我的头痛结束了！感谢您的帮助，它让我找到了一些我没有尝试过的新方法。

UIImage *firstButtonImage = [UIImage imageNamed:@"firstButton"];
firstButtonImage = [firstButtonImage imageWithRenderingMode:UIImageRenderingModeAlwaysTemplate];

UIButton *firstButton = [[UIButton alloc] initWithFrame:CGRectMake(0, 0, 35, 35)];
[firstButton setImage:firstButtonImage forState:UIControlStateNormal];
[firstButton addTarget:self action:@selector(firstButtonPressed) forControlEvents:UIControlEventTouchUpInside];

UIImage *secondButtonImage = [UIImage imageNamed:@"secondButton"];
secondButtonImage = [secondButtonImage imageWithRenderingMode:UIImageRenderingModeAlwaysTemplate];

UIButton *secondButton = [[UIButton alloc] initWithFrame:CGRectMake(45, 0, 35, 35)];
[secondButton setImage:secondButtonImage forState:UIControlStateNormal];
[secondButton addTarget:self action:@selector(secondButtonPressed) forControlEvents:UIControlEventTouchUpInside];

UIView *leftBarItemsView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 80, 35)];
[leftBarItemsView addSubview:firstButton];
[leftBarItemsView addSubview:secondButton];

UIBarButtonItem *leftBarItem = [[UIBarButtonItem alloc] initWithCustomView:leftBarItemsView];

[self.navigationItem setLeftBarButtonItems:[NSArray arrayWithObject:leftBarItem]];

Answer 2

可能有更好的方法，但为了纠正 iOS 7 上条形按钮项目的间距问题，我将 UINavigationBar 子类化并覆盖了 layoutSubviews 方法。在那里，您可以将每个条形按钮项移动到任何您想要的位置。

举个例子：

- (void)layoutSubviews
{
    [super layoutSubviews];

    // If iOS 7, fix the bar button positions
    BOOL isIOS7 = [[[UIDevice currentDevice] systemVersion] compare:@"7" options:NSNumericSearch] != NSOrderedAscending;
    if (isIOS7)
    {
        for (UIBarButtonItem *item in self.topItem.leftBarButtonItems)
        {
            // Reposition the customView property
        }

        for (UIBarButtonItem *item in self.topItem.rightBarButtonItems)
        {
            // Reposition the customView property
        }
    }
}

实际上，当我查看我的代码时，我正在使用带有自定义视图的 UIBarButtonItems。所以我能够移动自定义视图位置。

如果您只是将 UIBarButtonItems 与如下图像一起使用，您可能需要遍历 UINavigationBar 的子视图来移动它们：

- (void)layoutSubviews
{
    [super layoutSubviews];

    // If iOS 7, fix the bar button positions
    BOOL isIOS7 = [[[UIDevice currentDevice] systemVersion] compare:@"7" options:NSNumericSearch] != NSOrderedAscending;
    if (isIOS7)
    {
        for (UIView *subview in self.subviews)
        {
            // Reposition as needed
        }      
    }
}