如何计算最佳的 titleView 宽度？

发布于 2024-07-30 07:27:30 字数 540 浏览 6 评论 0原文

我正在使用带有自定义 UIView 子类的导航，该子类成为我的 titleView。我想确保这是完整的可用宽度。

从逻辑上讲，从我的 UIViewController 的 viewWillAppear: 来看，这应该是：（

CGFloat width = self.width - self.navigationItem.leftBarButtonItem.width - someConstant;

我这里没有合适的项目。）

然后，这会适应不同可能的宽度leftBarButtonItem。问题是 leftBarButtonItem 为 nil，因此 leftBarButtonItem.width 始终为 0（无论如何，在模拟器中）。

backBarButtonItem 也是零。

我应该做什么呢？

原文

I am using navigation with a custom UIView subclass that becomes my titleView. I want to ensure this is the full available width.

Logically from my UIViewController's viewWillAppear:, this should be:

CGFloat width = self.width - self.navigationItem.leftBarButtonItem.width - someConstant;

(I don't have a right item here.)

This would adapt, then, for different possible widths of the leftBarButtonItem. The catch is that leftBarButtonItem is nil, so leftBarButtonItem.width is always 0 (well, in the simulator anyway).

backBarButtonItem is also nil.

What should I be doing instead?

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没有你我更好 2024-08-06 07:27:30

我通过执行以下操作来解决这个问题：

    int vcStackSize = [[self.navigationController viewControllers] count];
    WEViewController* previousController = [[self.navigationController viewControllers] objectAtIndex:vcStackSize - 2];

    NSString* previousTitle = [previousController title];

    UIFont* font = [UIFont boldSystemFontOfSize:12];


    lw = [previousTitle sizeWithFont:font].width + 26;

令人讨厌但它有效

I hacked this by doing the following:

    int vcStackSize = [[self.navigationController viewControllers] count];
    WEViewController* previousController = [[self.navigationController viewControllers] objectAtIndex:vcStackSize - 2];

    NSString* previousTitle = [previousController title];

    UIFont* font = [UIFont boldSystemFontOfSize:12];


    lw = [previousTitle sizeWithFont:font].width + 26;

Nasty but it works

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