如何让我的UINavigationBar在iOS7上完全透明?

时间:2013-09-19 23:07:54

标签: ios objective-c ios7

我正在努力使应用程序与iOS7兼容,而且我遇到了UINavigationBar的问题,这让我发疯了:

我想让我的navigationBar完全透明,没有任何模糊或backgroundPicture,但包含并显示navigationItem按钮。

在iOS6中,我曾经这样做过:

UIImage *maskedImage = [UIImage imageNamed:@"transparent_image.png"]
[navigationBar setBackgroundImage:maskedImage forBarMetrics:UIBarMetricsDefault];

但它在iOS7上不再起作用了。

有什么建议吗?

2 个答案:

答案 0 :(得分:2)

也许this会回答你的问题?如果您选择视图控制器,然后取消选中“在顶部条下方延伸边缘”旁边的框,则背景图像不会在其下方出血。

答案 1 :(得分:0)

@implementation MyCustomNavigationBar

- (id)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    if (self) {
        [self setup];
    }
    return self;
}

- (id)initWithCoder:(NSCoder *)aDecoder {
    self = [super initWithCoder:aDecoder];
    if (self) {
        [self setup];
    }
    return self;
}

- (void)setup {
    [self setupBackground];
}

- (void)setupBackground {
    self.backgroundColor = [UIColor clearColor];
    self.tintColor = [UIColor clearColor];

    // make navigation bar overlap the content
    self.translucent = YES; 
    self.opaque = NO;

    // remove the default background image by replacing it with a clear image
    [self setBackgroundImage:[self.class maskedImage] forBarMetrics:UIBarMetricsDefault];

    // remove defualt bottom shadow
    [self setShadowImage: [UIImage new]]; 
}

+ (UIImage *)maskedImage {
    const float colorMask[6] = {222, 255, 222, 255, 222, 255};
    UIImage *img = [UIImage imageNamed:@"nav-white-pixel-bg.jpg"];
    return [UIImage imageWithCGImage: CGImageCreateWithMaskingColors(img.CGImage, colorMask)];
}

@end