子类化 UINavigationBar ...如何在 UINavigationController 中使用它?

Subclassing UINavigationBar ... how do I use it in UINavigationController?(子类化 UINavigationBar ...如何在 UINavigationController 中使用它?)

问题描述

我想继承 UINavigationBar(设置自定义背景图像和文本颜色)并将其用于我应用程序中的所有导航栏.查看 UINavigationController 的 API 文档，看起来 navigationBar 是只读的:

I wanted to subclass UINavigationBar (to set a custom background image & text color) and use that for all the navigation bars in my app. Looking at the API docs for UINavigationController, it looks like navigationBar is read-only:

@property(nonatomic, readonly) UINavigationBar *navigationBar

@property(nonatomic, readonly) UINavigationBar *navigationBar

有没有办法在我的 UIViewControllers 中实际使用自定义 UINavigationBar?我知道其他应用已经做了自定义导航栏，比如 flickr:

Is there a way to actually use a custom UINavigationBar in my UIViewControllers? I know that other apps have done custom navigation bars, like flickr:

http://img.skitch.com/20100520-bpxjaca11h5xne5yakjdc2m6xx.png

这是我的 UINavigationBar 子类:

Here is my UINavigationBar subclass:

#import <UIKit/UIKit.h>

@interface MyNavigationBar : UINavigationBar <UINavigationBarDelegate> {

}

@end

实现

#import "MyNavigationBar.h"

@implementation MyNavigationBar

- (id)initWithFrame:(CGRect)frame {
    if (self = [super initWithFrame:frame]) {
        // Initialization code
    }
    return self;
}

- (void)drawRect:(CGRect)rect {
    // override the standard background with our own custom one
    UIImage *image = [[UIImage imageNamed:@"navigation_bar_bgd.png"] retain];
    [image drawInRect:rect];
    [image release];
}

#pragma mark -
#pragma mark UINavigationDelegate Methods

- (void)navigationController:(UINavigationController *)navigationController willShowViewController:(UIViewController *)viewController animated:(BOOL)animated{
    // use the title of the passed in view controller
    NSString *title = [viewController title];

    // create our own UILabel with custom color, text, etc
    UILabel *titleView = [[UILabel alloc] init];
    [titleView setFont:[UIFont boldSystemFontOfSize:18]];
    [titleView setTextColor:[UIColor blackColor]];
    titleView.text = title;
    titleView.backgroundColor = [UIColor clearColor];
    [titleView sizeToFit];

    viewController.navigationItem.titleView = titleView;
    [titleView release];

    viewController.navigationController.navigationBar.tintColor = [UIColor colorWithRed:0.1 green:0.2 blue:0.3 alpha:0.8];
}
- (void)navigationController:(UINavigationController *)navigationController didShowViewController:(UIViewController *)viewController animated:(BOOL)animated{
}


- (void)dealloc {
    [super dealloc];
}

@end

我知道我可以使用一个类别来改变背景图片，但我仍然希望能够设置导航栏标题的文本颜色

I know that I can use a category to change the background image, but i still want to be able to set the text color of the navigation bar title

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

有什么建议或其他解决方案吗?我基本上想创建像 Flickr 的应用导航栏这样的浅色背景和深色文本

any suggestions or other solutions? I basically want to create a light background and dark text like Flickr's app navigation bars

推荐答案

我不知道你是否明白这一点.但是对于其他可能有这个问题的人......

I dunno if you got this figured out. But for others that might have this problem...

您需要做的是在您的 XIB 中将类指定为您的类名(在本例中为 MyNavigationBar.

What you need to do is to specify the class in your XIB to your class name (in this case MyNavigationBar.

查看 WWDC 2011 中的会话 123.

Check session 123 in WWDC 2011.

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