ios 更改 UINavigationBar 背景图像
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Changing the UINavigationBar background image
提问by Prine
I've been trying to change the background image of the UINavigationBar of my application. I tried several ways. First I added to my AppDelegate class the following code:
我一直在尝试更改应用程序 UINavigationBar 的背景图像。我尝试了几种方法。首先，我在 AppDelegate 类中添加了以下代码：
@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
But it wasn't working. My next try was to write a CustomizedNavigationBar Class which is overriding the drawRectmethod. It looked like that:
但它不起作用。我的下一个尝试是编写一个自定义导航栏类，它覆盖了drawRect方法。它看起来像这样：
CustomizedNavigationBar.h
自定义导航栏.h
#import <UIKit/UIKit.h>
@interface CustomizedNavigationBar : UINavigationBar
@end
CustomizedNavigationBar.m
自定义导航栏.m
#import "CustomizedNavigationBar.h"
@implementation CustomizedNavigationBar
- (void) drawRect:(CGRect)rect {
UIImage *image = [UIImage imageNamed: @"navigationbar.png"];
[image drawInRect:CGRectMake(0, 0, self.frame.size.width, self.frame.size.height)];
NSLog(@"I got called!!!!!");
}
@end
In my .xib file where the NavigationBar is defined I changed the class to the new CustomizedNavigationBar. But still it is not working..
在定义 NavigationBar 的 .xib 文件中，我将类更改为新的 CustomizedNavigationBar。但它仍然不起作用..
As another test I downloaded an example project where the background image should be changed. But even with that sample code it was not working.
作为另一个测试，我下载了一个应该更改背景图像的示例项目。但即使使用该示例代码，它也无法正常工作。
What am I doing wrong? I am using IOS 5. Any suggestions or other ways I could define a background image?
我究竟做错了什么？我正在使用 IOS 5。有什么建议或其他方法可以定义背景图像吗？
Thanks for your answers!
感谢您的回答！
回答by Craz
Starting in iOS 5 you should use the -setBackgroundImage:forBarMetrics:method:
从 iOS 5 开始，您应该使用以下-setBackgroundImage:forBarMetrics:方法：
[myNavbar setBackgroundImage:[UIImage imageNamed: @"UINavigationBarBackground.png"]
forBarMetrics:UIBarMetricsDefault];
And in Swift 4:
在Swift 4 中：
navigationBar.setBackgroundImage(UIImage(named: "UINavigationBarBackground.png"),
for: .default)
回答by theunexpected1
Considering all iOS versions, this seems to be accomplishing both Custom background image and Custom size of UINavigationBar:
考虑到所有 iOS 版本，这似乎同时完成了 UINavigationBar 的自定义背景图像和自定义大小：
@interface CustomNavigationBar : UINavigationBar
@end
@implementation CustomNavigationBar
-(void) drawRect:(CGRect)rect
{
UIImage *image = [UIImage imageNamed: @"navigationBar"];
[image drawInRect:CGRectMake(0, 0, self.frame.size.width, self.frame.size.height)];
//for iOS5
[self setBackgroundImage:[UIImage imageNamed: @"navigationBar"] forBarMetrics:UIBarMetricsDefault];
}
//for custom size of the UINavigationBar
- (CGSize)sizeThatFits:(CGSize)size {
CGSize newSize = CGSizeMake(320,31);
return newSize;
}
@end
I use such codes in a common place like a Utilities file.
我在一个常见的地方使用这样的代码，比如一个实用程序文件。
Hope this helps.
希望这可以帮助。
回答by Ajay Sharma
Just try with this code.. In your implmentation (.m) file.
只需尝试使用此代码.. 在您的实现 (.m) 文件中。
#import "RootViewController.h"
@implementation UINavigationBar (CustomImage)
- (void)drawRect:(CGRect)rect {
UIImage *image = [UIImage imageNamed: @"navheader.png"];
[image drawInRect:CGRectMake(0, 0, self.frame.size.width, self.frame.size.height)];
}
@end
@implementation RootViewController
@implementation 根视图控制器
- (void)viewDidLoad {
[super viewDidLoad];
// Uncomment the following line to display an Edit button in the navigation bar for this view controller.
// self.navigationItem.rightBarButtonItem = self.editButtonItem;
self.title=@"You are Done.";
}
This has worked in excellent way for me.
这对我来说非常有效。
Above Code Worked for only IOS 4. if you use the IOS 5 then use.....
以上代码仅适用于 IOS 4。如果您使用 IOS 5，则使用.....
[myNavbar setBackgroundImage:[UIImage imageNamed:
@"UINavigationBarBackground.png"]
forBarMetrics:UIBarMetricsDefault];
回答by Pavel Sich
Well for iOS 4 there is a simple solution, like:
对于 iOS 4，有一个简单的解决方案，例如：
nvc.navigationBar.layer.contents = (id)img.CGImage;
回答by Minakshi
You can add UIImageview to navigation bar as follows UINavigationBar navBar = [[UINavigationBar alloc]init]; [navBar addSubview: imageview]; [navBar release];
您可以将 UIImageview 添加到导航栏，如下所示 UINavigationBar navBar = [[UINavigationBar alloc]init]; [navBar addSubview: imageview]; [导航栏发布];
You can check the post : iPhone - NavigationBar Custom Background
您可以查看帖子： iPhone - NavigationBar 自定义背景
回答by Gajendra K Chauhan
You can also try this for Navigationbar Background.
您也可以在导航栏背景中尝试此操作。
UINavigationBar *navigationBar = self.navigationController.navigationBar;
UIImage *image = [UIImage imageNamed: @"NavBar-Wood.png"];
[navigationBar setBackgroundImage:image forBarMetrics: UIBarMetricsDefault];
self.navigationController.navigationBar.tintColor = [UIColor brownColor];
Thanks.
谢谢。
回答by karim
Another way to set an image in navigation bar is,
在导航栏中设置图像的另一种方法是，
UIImage* logo = [ UIImage imageNamed:@"Logo.png" ];
UIImageView* logoView = [[[UIImageView alloc] initWithImage:logo] autorelease];
self.navigationItem.titleView = logoView;
This will not change whole navigation bar background. But adds a background image centered on the navigation bar, which is sometime more intended (what I was looking for).
这不会改变整个导航栏背景。但是添加了一个以导航栏为中心的背景图像，这有时更有意（我正在寻找）。
