Objective-C:导航栏中的背景图片和标题 [英] Objective-C: Background image and title in Navigation Bar

问题描述

在导航栏中需要背景图片和标题.对于图像，我写了一个类别:

In need a background image AND a title in my Navigation Bar. For the image I write a category:

@implementation UINavigationBar(MyNavigationBar)
- (void)setBackgroundImage {
    UIImageView *aTabBarBackground = [[UIImageView alloc]initWithImage:[UIImage imageNamed:@"navBarBackgrd.png"]];
    [self addSubview: aTabBarBackground];
    [self sendSubviewToBack: aTabBarBackground];
    [aTabBarBackground release];
}
@end

我在AppDelegate中将此类别称为类别"，并且在整个应用程序中都有背景图片:

I call this category in my AppDelegate and have background images in the whole application:

[navigationController.navigationBar setBackgroundImage]; 

每个ViewController都有标题:

Every ViewController has a title:

[self setTitle:@"MyTitle"];

但是设置背景图像后，标题出现了问题.

But after setting the background image, I have a problem with the title.

在每幅作品的第一个视图中，我看到背景图像和标题:-) 但是在下一个视图中，标题消失了.仅背景图像可见.也许标题在图片下方?

In the first view every works, I see the background image and the title :-) But in the next view, the title disappears. Only the background image is visible. Maybe the title is under the image?

从技术上讲，可以同时显示两者.有了这个技巧，它就可以工作了:

Technically it's possible to show both. With this trick it works:

1. 在打开下一个ViewController之前隐藏导航栏:

1. Hide Navigation Bar BEFORE opening the next ViewController:

[self.navigationController setNavigationBarHidden:YES];

[self.navigationController setNavigationBarHidden:YES];

在下一个ViewController中显示导航栏:

Show the Navigation Bar in the next ViewController:

[self.navigationController setNavigationBarHidden:NO];

[self.navigationController setNavigationBarHidden:NO];

现在，图像和标题可见，但是这种解决方案不是最好的;-)

Now, image AND title are visible, but this solution isn't the best ;-)

推荐答案

我明白了！

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

请参见导航视图的背景图像

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