如何在 iphone 导航栏上添加背景图片? [英] How to add background image on iphone Navigation bar?

问题描述

我想为导航栏添加图像背景.

I want to add an image background to my navigation bar.

对吗?

//set custom background image
UIImageView *backgroundView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"NavigationBackground.png"]];
[self.navigationBar insertSubview:backgroundView atIndex:0];
[backgroundView release];

推荐答案

这是 link @luvieere 提到.将此代码粘贴到上面的 rootview 控制器中@implementation rootviewController

Here's the code from the link @luvieere mentioned. Paste this code into to the rootview controller just above @implementation rootviewController

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

从 iOS 5 开始，有一种官方方法可以做到这一点.(参见 iOS 开发者库)

As of iOS 5, there is an official way to do this. (see iOS Developer Library)

// someplace where you create the UINavigationController
if ([navigationController.navigationBar respondsToSelector:@selector(setBackgroundImage:forBarMetrics:)] ) {
    UIImage *image = [UIImage imageNamed:@"NavigationBar.png"];
    [navigationBar setBackgroundImage:image forBarMetrics:UIBarMetricsDefault];
}

但是，除非您真的想放弃 iOS 4 及更低版本，否则请保留旧代码以实现向后兼容性.

But still, retain the old code for backward compatibility unless you really want to ditch iOS 4 and below.

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