导航栏 + 搜索控制器 + 大标题:滚动时的细线 [英] Navigation bar + Search controller + Large title: Hairline during scrolling

问题描述

上下文:

• UINavigationController 带有 UITableViewController
• UISearchController 在导航栏中
• 半透明黑色导航栏，使用大标题，tintColor，barTintColor(所以没有背景图片).

• UINavigationController with a UITableViewController
• UISearchController in the navigation bar
• Navigation bar translucent with black style, it uses large title, tintColor, barTintColor (so no background image).

问题:

我有一个奇怪的动画故障，在搜索栏上方显示一条细线.细线仅在滚动期间出现.

I have a strange animation glitch that shows a hairline above the search bar. The hairline appears only during the scroll.

针对类似问题，我已经尝试了很多解决方案，但都没有帮助.

I have already tried many solutions concerning similar problems, but they have not helped.

在装有 iOS 12.1.3 的 iPhone 7 上测试

Tested with an iPhone 7 with iOS 12.1.3

推荐答案

您可以使用此解决发际线问题

You can fix hairline issue using this

searchController.searchBar.layer.borderColor = UIColor(red: 242/255.0, green: 82/255.0, blue: 46/255.0, alpha: 1).CGColor
searchController.searchBar.layer.borderWidth = 1

如果上述方法不起作用.你可以完全去除发际线

if the above didn’t work. you can remove the hairline completely

extension UINavigationBar {
        func hideBottomHairline() {
            self.hairlineImageView?.isHidden = true
        }

        func showBottomHairline() {
            self.hairlineImageView?.isHidden = false
        }
    }

extension UIView {
    fileprivate var hairlineImageView: UIImageView? {
        return hairlineImageView(in: self)
    }

    fileprivate func hairlineImageView(in view: UIView) -> UIImageView? {
        if let imageView = view as? UIImageView, imageView.bounds.height <= 1.0 {
            return imageView
        }

        for subview in view.subviews {
            if let imageView = self.hairlineImageView(in: subview) { return imageView }
        }

        return nil
    }
}

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