如何使UINavigationBar透明?虽然我希望它的栏项仍然可见。
当前回答
下面的代码扩展了为这个线程选择的顶部答案,以消除底部边框并设置文本颜色:
The last two coded lines of this code set transparency. I borrowed that code from this thread and it worked perfectly! The "clipsToBounds" property was code I found which got rid of the bottom border line with OR without transparency set (so if you decide to go with a solid white/black/etc. background instead, there will still be no border line). The "tintColor" line (2nd coded line) set my back button to a light grey I kept barTintColor as a backup. I don't know why transparency would not work, but if it doesn't, I want my bg white as I used to have it let navigationBarAppearace = UINavigationBar.appearance() navigationBarAppearace.tintColor = UIColor.lightGray navigationBarAppearace.barTintColor = UIColor.white navigationBarAppearace.clipsToBounds = true navigationBarAppearace.isTranslucent = true navigationBarAppearace.setBackgroundImage(UIImage(), for: .default) navigationBarAppearace.shadowImage = UIImage()
其他回答
这适用于Swift 5。
// Clear the background image.
navigationController?.navigationBar.setBackgroundImage(UIImage(), for: .default)
// Clear the shadow image.
navigationController?.navigationBar.shadowImage = UIImage()
// Ensure the navigation bar is translucent.
navigationController?.navigationBar.isTranslucent = true
extension UINavigationBar {
var isTransperent: Bool {
get {
return false // Just to satisfy property
}
set {
if newValue {
self.shadowImage = UIImage()
self.isTranslucent = true
self.setBackgroundImage(UIImage(), for: .default)
} else {
self.shadowImage = UIImage()
self.isTranslucent = false
self.setBackgroundImage(nil, for: .default)
}
}
}
}
在iOS5中,你可以这样做,使导航栏透明:
nav.navigationBar.translucent = YES; // Setting this slides the view up, underneath the nav bar (otherwise it'll appear black)
const float colorMask[6] = {222, 255, 222, 255, 222, 255};
UIImage *img = [[UIImage alloc] init];
UIImage *maskedImage = [UIImage imageWithCGImage: CGImageCreateWithMaskingColors(img.CGImage, colorMask)];
[nav.navigationBar setBackgroundImage:maskedImage forBarMetrics:UIBarMetricsDefault];
[img release];
在按照上面大家说的去做之后,也就是:
navigationController?.navigationBar.setBackgroundImage(UIImage(), forBarMetrics: .default)
navigationController?.navigationBar.shadowImage = UIImage()
navigationController!.navigationBar.isTranslucent = true
... 我的导航栏还是白色的。所以我加了这一行:
navigationController?.navigationBar.backgroundColor = .clear
... 果不其然!这似乎奏效了。
另一种方式,为我工作是子类UINavigationBar和留下drawRect方法空!!
@IBDesignable class MONavigationBar: UINavigationBar {
// Only override drawRect: if you perform custom drawing.
// An empty implementation adversely affects performance during animation.
override func drawRect(rect: CGRect) {
// Drawing code
}}
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