1

当屏幕切换到横向模式时,我想为导航栏设置更大的背景。所以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;
}

结果在纵向模式下很好:

在此处输入图像描述

这在 iOS 6 的横向模式下也很有效:

在此处输入图像描述

但这就是 iOS 7 横向模式的结果:

在此处输入图像描述

您可以看到状态栏与导航栏重叠,并且导航栏底部有一些额外的空间。(附带说明,我编辑了 info.plist 文件以修复重叠状态栏问题。这仅在我尝试为导航栏设置新背景图像时发生。)您对这个问题有什么建议吗?如果你这样做,请告诉我,谢谢。

4

2 回答 2

2

所以感谢@eagle.dan.1349的回答,我想出了一个主意:我将导航栏背景的高度扩展为包括状态栏的高度,然后从下方开始绘制背景图像以离开空间对于状态栏:

+ (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!真的希望这对像我这样试图保持 iOS 6 状态栏风格的人有所帮助。

于 2013-11-07T16:06:28.533 回答
1

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”与状态栏的斗争,并调整你的形象以适应它。您可以尝试在图像顶部添加 20 像素的黑色。

于 2013-11-07T12:19:56.590 回答