最好点覆盖navigationController的navigationBar属性

发布于 2024-09-03 08:37:21 字数 384 浏览 4 评论 0原文

我正在覆盖 UINavigationController，以将默认的 navigationBar 属性替换为我自己的 UINavigationBar 子类的实例。所以我尝试了类似

_navigationBar = [[SBNavigationBar alloc] init];

-initWithRootViewController: 的方法。但这并没有像我预期的那样进行。仍然显示默认的 navigationBar。

那么覆盖 navigationBar 的最佳点是什么？

提前致谢
–f

原文

I'm overwriting UINavigationController to replace the default navigationBar property with an instance of my own subclass of UINavigationBar. So I tried something like

_navigationBar = [[SBNavigationBar alloc] init];

in my -initWithRootViewController:. But that didn't work out as I expected it. There's still the default navigationBar being displayed.

So what's the best point to overwrite the navigationBar?

Thanks in advance
–f

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素染倾城色 2024-09-10 08:37:21

如果您检查文档 http://developer .apple.com/iphone/library/documentation/uikit/reference/UINavigationController_Class/Reference/Reference.html，您会看到 navigationBar 属性是只读< /强>。

例如，要拥有自定义navigationBar，您可以使用“类别”。您会在 stackoverflow 上找到许多可以回答这个问题的问题。

一个简单的版本是将图像放入 drawRect: 中，如下所示......

@implementation UINavigationBar (Custom)

- (void)drawRect:(CGRect)rect {
    UIImage *image = [UIImage imageNamed: @"bg_toolbar.png"];
    [image drawInRect:CGRectMake(0, 0, self.frame.size.width, self.frame.size.height)];
}

@end

If you check the documentation http://developer.apple.com/iphone/library/documentation/uikit/reference/UINavigationController_Class/Reference/Reference.html, you'll see that the navigationBar property is read-only.

To have a custom navigationBar you can use Categories for example. You will find many questions answering this here on stackoverflow.

One simple version is putting an image in drawRect: like so...

@implementation UINavigationBar (Custom)

- (void)drawRect:(CGRect)rect {
    UIImage *image = [UIImage imageNamed: @"bg_toolbar.png"];
    [image drawInRect:CGRectMake(0, 0, self.frame.size.width, self.frame.size.height)];
}

@end

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