根据横向/纵向更改 UINavigationBar 背景？

Posted 2023-03-10

【中文标题】根据横向/纵向更改 UINavigationBar 背景？

【英文标题】：Changing the UINavigationBar background depending on landscape/portrait?

【发布时间】：2013-10-05 08:51:30

【问题描述】：

我希望我的 UINavigationBar 在我的 SignatureViewController 中正确旋转。这是当前旋转时在纵向和横向模式下的外观：http://tinypic.com/view.php?pic=2w5573a&s=5#.Uk5kgYapWrg

如您所见，UINavigationBar 在横向时不会按宽度缩放。我的项目是这样构建的：

rootViewController(UINavgationController) ------模态推送-----> SignatureViewController

(portrait only)                                    (portrait/landscape)

请注意，我没有使用普通推送到 SignatureViewController，我使用的是模态推送。以防万一我想提及这一点，因为我不确定它是否会以任何奇怪的方式影响结果？...我尝试了不同的方法来更改 NavigationBar 的背景，具体取决于它是横向还是纵向。我将在下面发布一些：

试试 nr1：不工作

- (void) viewWillAppear:(BOOL)animated 

[[UINavigationBar appearance]setBackgroundImage:[UIImage imageNamed:@"bar_nav_black.png"] forBarMetrics:UIBarMetricsDefault];
[[UINavigationBar appearance]setBackgroundImage:[UIImage imageNamed:@"navbar25g.png"]  forBarMetrics:UIBarMetricsLandscapePhone];

[[UINavigationBar appearance] setAutoresizingMask:UIViewAutoresizingFlexibleWidth];

试试 nr2：不工作

- (void) viewWillAppear:(BOOL)animated 

 UIImage *navBarLandscape =  [[UIImage imageNamed:@"navbar25g.png"] resizableImageWithCapInsets:UIEdgeInsetsMake(x,x,x,x)];

 [[UINavigationBar appearance]setBackgroundImage:[UIImage imageNamed:@"bar_nav_black.png"] forBarMetrics:UIBarMetricsDefault];
 [[UINavigationBar appearance]setBackgroundImage:navBarLandscape  forBarMetrics:UIBarMetricsDefault];

 [[UINavigationBar appearance] setAutoresizingMask:UIViewAutoresizingFlexibleWidth];

试试 nr3：不工作

- (void)applicationDidChangeStatusBarOrientation:(NSNotification *)notification


UIView *v =  [[UIView alloc]init];

int a = [[notification.userInfo objectForKey: UIApplicationStatusBarOrientationUserInfoKey] intValue];
int w = [[UIScreen mainScreen] bounds].size.width;
int h = [[UIScreen mainScreen] bounds].size.height;
switch(a)
    case 4:
        v.frame =  CGRectMake(0,20,w,h);
        [[UINavigationBar appearance]setBackgroundImage:[UIImage imageNamed:@"bar_nav_black.png"] forBarMetrics:UIBarMetricsDefault];//Have also tried with UIBarMetricsLandscapePhone...
        NSLog(@"willrotate:1");

        break;
    case 3:
        v.frame =  CGRectMake(-20,0,w-20,h+20);
        [[UINavigationBar appearance]setBackgroundImage:[UIImage imageNamed:@"navbar25g.png"] forBarMetrics:UIBarMetricsDefault];//Have also tried with UIBarMetricsLandscapePhone...
        NSLog(@"willrotate:2");
         [self.view addSubview:v];
        break;
    case 2:
        v.frame =  CGRectMake(0,-20,w,h);
        [[UINavigationBar appearance]setBackgroundImage:[UIImage imageNamed:@"bar_nav_black.png"] forBarMetrics:UIBarMetricsDefault];//Have also tried with UIBarMetricsLandscapePhone...
        NSLog(@"willrotate:3");

        break;
    case 1:
        v.frame =  CGRectMake(20,0,w-20,h+20);
        NSLog(@"willrotate:4");
        [[UINavigationBar appearance]setBackgroundImage:[UIImage imageNamed:@"navbar25g.png"]  forBarMetrics:UIBarMetricsDefault];//Have also tried with UIBarMetricsLandscapePhone...

请注意，在 try nr3 中，NSLog 可以工作，但它拒绝更改 UINavigationBar 的背景。那么，有什么想法我会从这里做什么？ / 问候

【参考方案1】：

您能否尝试实现UINavigationBar 类并覆盖一个drawRect: 方法

它应该可以工作

@implementation UINavigationBar (BackgroundImage)

- (void)drawRect:(CGRect)rect 

    UIImage *navimage;
    //we will check if screen width is 320 then it will be potrait
    if(self.frame.size.width == 320) 
    
        navimage = [UIImage imageNamed: @"Your Potrait nav bar image"];
    
    else
    
        navimage = [UIImage imageNamed: @"Your Landscape nav bar image"];
    

    [navimage drawInRect:CGRectMake(0, 0, self.frame.size.width, self.frame.size.height)];


@end

希望对你有帮助...

只需对 nr1 和 nr2 试试这个

只需用这个更改最后一行代码..如果它工作与否...让我知道

self.navigationController.navigationBar.autoresizingMask = UIViewAutoresizingFlexibleTopMargin; //UIViewAutoresizingFlexibleWidth