Question

当屏幕切换到横向模式时，我想为导航栏设置更大的背景。这就是我在视图控制器中所做的：

- (void)willAnimateRotationToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration
{
    UIDeviceOrientation deviceOrientation = toInterfaceOrientation;

    if([[UINavigationBar class] respondsToSelector:@selector(appearance)]) {
        [self.navigationController.navigationBar setBackgroundImage: [UIImageHelper createTopBar: deviceOrientation] forBarMetrics: UIBarMetricsDefault];
    }
    else
        [self.navigationController.navigationBar setBackgroundColor: [UIColor colorWithPatternImage: [UIImageHelper createTopBar: [[UIDevice currentDevice] orientation]]]];
}

这是createTopBar方法：

+ (UIImage *)createTopBar: (UIDeviceOrientation) orientation {
    // Create a new image context
    CGSize size;
    if (orientation == UIInterfaceOrientationLandscapeLeft || orientation == UIInterfaceOrientationLandscapeRight){
        if ([UIDevice isiPhone5]) {
            size = CGSizeMake(568, 34);
            UIGraphicsBeginImageContextWithOptions(CGSizeMake(568, 34), NO, 0.0);
        }
        else if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad) {
            size = CGSizeMake(1024, 44);
            UIGraphicsBeginImageContextWithOptions(size, NO, 0.0);
        }
        else {
            size = CGSizeMake(480, 34);
            UIGraphicsBeginImageContextWithOptions(CGSizeMake(480, 34), NO, 0.0);
        }
    }
    else{
        if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad) {
            size = CGSizeMake(768, 44);
            UIGraphicsBeginImageContextWithOptions(CGSizeMake(768, 44), NO, 0.0);
        }
        else if ([UIDevice isiPhone5]) {
            size = CGSizeMake(320, 44);
            UIGraphicsBeginImageContextWithOptions(CGSizeMake(320, 44), NO, 0.0);
        }
        else {
            size = CGSizeMake(320, 44);
            UIGraphicsBeginImageContextWithOptions(CGSizeMake(320, 44), NO, 0.0);
        }
    }
    UIImage * image = [UIImage imageNamed: @"top_bar_without_title"];

    [image drawInRect:CGRectMake(0, 0, size.width, size.height+4)];
    UIImage * destImage = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    return destImage;
}

在纵向模式下结果很好：

enter image description here

这在iOS 6中的横向模式下也很有效：

enter image description here

但这就是iOS 7中横向模式的结果：

enter image description here

您可以看到状态栏与导航栏重叠，导航栏底部还有一些额外的空间。（另一方面，我已经编辑了info.plist文件来修复重叠状态栏问题。这只有在我尝试为导航栏设置新的背景图像时才会发生。）你对这个问题有什么建议吗？如果你这样做，请告诉我，谢谢你。

Answer 1

感谢@ eagle.dan.1349的回答，我想出了一个想法：我将导航栏背景的高度扩展到包含状态栏的高度，然后开始从低到高的绘制背景图像留下状态栏的空间：

+ (UIImage *)createTopBar: (UIDeviceOrientation) orientation {
    // Create a new image context
    CGSize size;
    if (orientation == UIInterfaceOrientationLandscapeLeft || orientation == UIInterfaceOrientationLandscapeRight){
        if ([UIDevice isiPhone5]) {
            if ([[[UIDevice currentDevice] systemVersion] floatValue] >= 7){
                size = CGSizeMake(568, 34);
                UIGraphicsBeginImageContextWithOptions(CGSizeMake(568, 54), NO, 0.0);
            }
            else {
                size = CGSizeMake(568, 34);
                UIGraphicsBeginImageContextWithOptions(CGSizeMake(568, 34), NO, 0.0);
            }

        }
        else if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad) {
            size = CGSizeMake(1024, 44);
            UIGraphicsBeginImageContextWithOptions(size, NO, 0.0);
        }
        else {
            if ([[[UIDevice currentDevice] systemVersion] floatValue] >= 7){
                size = CGSizeMake(480, 34);
                UIGraphicsBeginImageContextWithOptions(CGSizeMake(480, 54), NO, 0.0);
            }
            else {
                size = CGSizeMake(480, 34);
                UIGraphicsBeginImageContextWithOptions(CGSizeMake(480, 34), NO, 0.0);
            }

        }
    }
    else{
        if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad) {
            size = CGSizeMake(768, 44);
            UIGraphicsBeginImageContextWithOptions(CGSizeMake(768, 44), NO, 0.0);
        }
        else if ([UIDevice isiPhone5]) {
            size = CGSizeMake(320, 44);
            UIGraphicsBeginImageContextWithOptions(CGSizeMake(320, 44), NO, 0.0);

        }
        else {
            size = CGSizeMake(320, 44);
            UIGraphicsBeginImageContextWithOptions(CGSizeMake(320, 44), NO, 0.0);

        }
    }
    UIImage * image = [UIImage imageNamed: @"top_bar_without_title"];

    if ((orientation == UIInterfaceOrientationLandscapeLeft ||
         orientation == UIInterfaceOrientationLandscapeRight) &&
        [[[UIDevice currentDevice] systemVersion] floatValue] >= 7){

        [[UIColor blackColor] set];
        UIRectFill(CGRectMake(0, 0, size.width, 40));
        [image drawInRect:CGRectMake(0, 20, size.width, size.height+4)];
    }
    else {
        [image drawInRect:CGRectMake(0, 0, size.width, size.height+4)];
    }
    UIImage * destImage = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    return destImage;
}

瞧，它就像一个魅力！真的希望这对于那些试图像我一样坚持iOS 6的状态栏风格的人来说有点帮助。

Answer 2

iOS 7在系统控制和外观方面有很多未记录的行为。我建议你“放弃”对抗状态栏并调整你的形象以适应它。您可以尝试在图像顶部添加20px的黑色。

iOS 7 - 在横向模式下设置导航栏的背景

2 个答案: