[英]How to make a Navigation Bar and Status Bar blurred (UIBlurEffect)? iOS, Swift 3
如何使导航栏和状态栏模糊(UIBlurEffect)? 当我通过点击图片向下滚动(Scroll View)到其他图片时,这张图片(在这种情况下是白色机器)在导航栏下只是丢失了,并且有必要在导航栏下看到这个图具有 UIBlurEffect 效果的导航栏。
我已经尝试过,但没有奏效:
func addBlurEffect() {
// Add blur view
let bounds = self.navigationController?.navigationBar.bounds as CGRect!
let visualEffectView = UIVisualEffectView(effect: UIBlurEffect(style: .light))
visualEffectView.frame = bounds!
visualEffectView.autoresizingMask = [.flexibleWidth, .flexibleHeight]
self.navigationController?.navigationBar.addSubview(visualEffectView)
self.navigationController?.navigationBar.sendSubview(toBack: visualEffectView)
visualEffectView.isUserInteractionEnabled = false }
首先,当滚动图片时,导航栏下的图片就会消失。
其次,状态栏保持灰色。
NavigationBar 的 UIBlurEffect 不好,StatusBar 没有 UIBlurEffect
为了状态栏不保持灰色,我尝试这样做,但无济于事=(
bounds.offsetBy(dx: 0.0, dy: -20.0)
bounds.size.height = bounds.height + 20.0
同样在didFinishLaunchingWithOptions中的AppDelegate(他用Objective-C编写的应用程序)中,我试图添加它保持不变,没有任何变化:
[[UINavigationBar appearance] setBackgroundImage:[[UIImage alloc]init] forBarMetrics:UIBarMetricsDefault];
[[UINavigationBar appearance] setShadowImage:[[UIImage alloc]init]];
[[UINavigationBar appearance] setBackgroundColor:[UIColor colorWithRed:0.0f green:0.0f blue:0.0f alpha:0.0f]];
[[UINavigationBar appearance] setTranslucent:YES];
请帮忙解决问题,我折腾了3天。
对不起,我的英语不好。
将背景图像设置到导航栏就可以了。 在 swift 3 下面的代码对我有用。
let visualEffectView = UIVisualEffectView(effect: UIBlurEffect(style: .light))
visualEffectView.frame = (self.navigationController?.navigationBar.bounds.insetBy(dx: 0, dy: -10).offsetBy(dx: 0, dy: -10))!
self.navigationController?.navigationBar.isTranslucent = true
self.navigationController?.navigationBar.setBackgroundImage(UIImage(), for: .default)
self.navigationController?.navigationBar.addSubview(visualEffectView)
输出:
离开@Vignesh 回答,硬编码-10 是个坏主意。 例如,这对于 iphone X 的大小将不正确。
// Find size for blur effect.
let statusBarHeight = UIApplication.shared.statusBarFrame.size.height
let bounds = self.navigationController?.navigationBar.bounds.insetBy(dx: 0, dy: -(statusBarHeight)).offsetBy(dx: 0, dy: -(statusBarHeight))
// Create blur effect.
let visualEffectView = UIVisualEffectView(effect: UIBlurEffect(style: .light))
visualEffectView.frame = bounds
// Set navigation bar up.
self.navigationController?.navigationBar.isTranslucent = true
self.navigationController?.navigationBar.setBackgroundImage(UIImage(), for: .default)
self.navigationController?.navigationBar.addSubview(visualEffectView)
self.navigationController?.navigationBar.sendSubview(toBack: visualEffectView)
我还建议创建 UINavigationController 的子类,因为这是一种很好的做法。 像这样的东西:
final class func MyCustomNavigation: UINavigationController {
override func viewDidLoad() {
// Find size for blur effect.
let statusBarHeight = UIApplication.shared.statusBarFrame.size.height
let bounds = navigationBar.bounds.insetBy(dx: 0, dy: -(statusBarHeight)).offsetBy(dx: 0, dy: -(statusBarHeight))
// Create blur effect.
let visualEffectView = UIVisualEffectView(effect: UIBlurEffect(style: .light))
visualEffectView.frame = bounds
// Set navigation bar up.
navigationBar.isTranslucent = true
navigationBar.setBackgroundImage(UIImage(), for: .default)
navigationBar.addSubview(visualEffectView)
navigationBar.sendSubview(toBack: visualEffectView)
}
}
斯威夫特 5、iOS 13 +
您可以在 AppDelegate 文件中使用UINavigationBarAppearance()
。 并且不要忘记为非滚动模式设置外观。 对我来说,它与 navigationBar.prefersLargeTitles 完美配合。
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
let appearance = UINavigationBarAppearance()
appearance.configureWithTransparentBackground()
appearance.backgroundColor = UIColor.clear
appearance.backgroundEffect = UIBlurEffect(style: .light) // or dark
let scrollingAppearance = UINavigationBarAppearance()
scrollingAppearance.configureWithTransparentBackground()
scrollingAppearance.backgroundColor = .white // your view (superview) color
UINavigationBar.appearance().standardAppearance = appearance
UINavigationBar.appearance().scrollEdgeAppearance = scrollingAppearance
UINavigationBar.appearance().compactAppearance = scrollingAppearance
return true
}
您也可以使用测试项目https://github.com/leningradspb/BlurNavigationBar检查此链接
斯威夫特 3
感谢@Vignesh 的回答和@Romain Caron 的评论,我结合了您的代码,以下代码在 Swift 3 中对我有用
let visualEffectView = UIVisualEffectView(effect: UIBlurEffect(style: .light))
visualEffectView.frame = (self.navigationController?.navigationBar.bounds.insetBy(dx: 0, dy: -10).offsetBy(dx: 0, dy: -10))!
self.navigationController?.navigationBar.isTranslucent = true
self.navigationController?.navigationBar.setBackgroundImage(UIImage(), for: .default)
self.navigationController?.navigationBar.addSubview(visualEffectView)
self.navigationController?.navigationBar.sendSubview(toBack: visualEffectView)
这是我用于同一件事的 Objective-C 代码,它包括对 iPhone X 超大导航栏的支持。
UIVisualEffectView *fxView = [[UIVisualEffectView alloc] initWithEffect:[UIBlurEffect effectWithStyle:UIBlurEffectStyleLight]];
[fxView setFrame:CGRectOffset(CGRectInset(self.navigationController.navigationBar.bounds, 0, -12), 0, -60)];
[self.navigationController.navigationBar setTranslucent:YES];
[self.navigationController.navigationBar setBackgroundImage:[UIImage new] forBarPosition:UIBarPositionAny barMetrics:UIBarMetricsDefault];
[self.navigationController.navigationBar insertSubview:fxView atIndex:1];
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