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iPhone 导航栏标题文本颜色

发布于 2024-07-14 18:26:13 字数 163 浏览 8 评论 0原文

iOS 导航栏标题颜色默认为白色。有没有办法将其更改为不同的颜色？

我知道使用图像的 navigationItem.titleView 方法。由于我的设计能力有限，未能达到标准的光泽度，所以我更喜欢更改文本颜色。

任何见解将不胜感激。

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香草可樂 2024-07-21 18:26:13

现代方法

现代方法，对于整个导航控制器......在加载导航控制器的根视图时执行一次。

[self.navigationController.navigationBar setTitleTextAttributes:
   @{NSForegroundColorAttributeName:[UIColor yellowColor]}];

不过，这似乎并没有对后续的观点产生影响。

经典方法

旧方法，每个视图控制器（这些常量适用于 iOS 6，但如果想在 iOS 7 外观上每个视图控制器执行此操作，您将需要相同的方法，但具有不同的常量）：

您需要使用 UILabel 作为 navigationItem 的 titleView。

标签应该：

具有清晰的背景颜色 (label.backgroundColor = [UIColorclearColor])。
使用粗体 20pt 系统字体 (label.font = [UIFont boldSystemFontOfSize: 20.0f])。
具有 50% Alpha 的黑色阴影 (label.shadowColor = [UIColor colorWithWhite:0.0 alpha:0.5])。
您还需要将文本对齐设置为居中（label.textAlignment = NSTextAlignmentCenter（对于旧版 SDK 为 UITextAlignmentCenter）。

将标签文本颜色设置为任何自定义颜色你确实想要一种不会导致文本融入阴影的颜色，这会很难阅读，

但我想出的值最终太简单了。它们不是 Apple 选择的:)

如果您想验证这一点，请将此代码放入 Apple 的导航栏示例。这会将文本替换为黄色标签。除了颜色之外，这应该与 Apple 代码生成的原始版本没有区别。

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self)
    {
        // this will appear as the title in the navigation bar
        UILabel *label = [[[UILabel alloc] initWithFrame:CGRectZero] autorelease];
        label.backgroundColor = [UIColor clearColor];
        label.font = [UIFont boldSystemFontOfSize:20.0];
        label.shadowColor = [UIColor colorWithWhite:0.0 alpha:0.5];
        label.textAlignment = NSTextAlignmentCenter;
                           // ^-Use UITextAlignmentCenter for older SDKs.
        label.textColor = [UIColor yellowColor]; // change this color
        self.navigationItem.titleView = label;
        label.text = NSLocalizedString(@"PageThreeTitle", @"");
        [label sizeToFit];
    }

    return self;
}

编辑：另外，请阅读下面 Erik B 的回答。我的代码显示了效果，但他的代码提供了一种更简单的方法来将其放置在现有视图控制器上。

Modern approach

The modern way, for the entire navigation controller… do this once, when your navigation controller's root view is loaded.

[self.navigationController.navigationBar setTitleTextAttributes:
   @{NSForegroundColorAttributeName:[UIColor yellowColor]}];

However, this doesn't seem have an effect in subsequent views.

Classic approach

The old way, per view controller (these constants are for iOS 6, but if want to do it per view controller on iOS 7 appearance you'll want the same approach but with different constants):

You need to use a UILabel as the titleView of the navigationItem.

The label should:

Have a clear background color (label.backgroundColor = [UIColor clearColor]).
Use bold 20pt system font (label.font = [UIFont boldSystemFontOfSize: 20.0f]).
Have a shadow of black with 50% alpha (label.shadowColor = [UIColor colorWithWhite:0.0 alpha:0.5]).
You'll want to set the text alignment to centered as well (label.textAlignment = NSTextAlignmentCenter (UITextAlignmentCenter for older SDKs).

Set the label text color to be whatever custom color you'd like. You do want a color that doesn't cause the text to blend into shadow, which would be difficult to read.

I worked this out through trial and error, but the values I came up with are ultimately too simple for them not to be what Apple picked. :)

If you want to verify this, drop this code into initWithNibName:bundle: in PageThreeViewController.m of Apple's NavBar sample. This will replace the text with a yellow label. This should be indistinguishable from the original produced by Apple's code, except for the color.

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self)
    {
        // this will appear as the title in the navigation bar
        UILabel *label = [[[UILabel alloc] initWithFrame:CGRectZero] autorelease];
        label.backgroundColor = [UIColor clearColor];
        label.font = [UIFont boldSystemFontOfSize:20.0];
        label.shadowColor = [UIColor colorWithWhite:0.0 alpha:0.5];
        label.textAlignment = NSTextAlignmentCenter;
                           // ^-Use UITextAlignmentCenter for older SDKs.
        label.textColor = [UIColor yellowColor]; // change this color
        self.navigationItem.titleView = label;
        label.text = NSLocalizedString(@"PageThreeTitle", @"");
        [label sizeToFit];
    }

    return self;
}

Edit: Also, read Erik B's answer below. My code shows the effect, but his code offers a simpler way to drop this into place on an existing view controller.

iPhone 导航栏标题文本颜色

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