![](/img/trans.png)
[英]How to draw a transparent UIToolbar or UINavigationBar in iOS7
[英]How can I make my UINavigationBar totally transparent on iOS7?
我正在開發與iOS7兼容的應用程序,並且遇到UINavigationBar的問題,這使我發瘋:
我想使我的navigationBar完全透明,沒有任何模糊或backgroundPicture,但包含並顯示navigationItem按鈕。
在iOS6中,我通常是這樣進行的:
UIImage *maskedImage = [UIImage imageNamed:@"transparent_image.png"]
[navigationBar setBackgroundImage:maskedImage forBarMetrics:UIBarMetricsDefault];
但它在iOS7上不再起作用。
有什么建議么 ?
也許這會回答您的問題? 如果您選擇視圖控制器,然后取消選中“在頂部欄下方擴展邊緣”旁邊的框,則背景圖像將不會在其下方流血。
@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
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