tabbar shadowImage异常，颜色从左到右变淡了

[longitachi]

您好，遇到个问题，设置tabbar shadowImage时候，会出现图中的情况，从左到右变淡了，代码如下

if #available(iOS 13.0, *) {
     let inlineLayoutAppearance = UITabBarItemAppearance()
    inlineLayoutAppearance.normal.titleTextAttributes = normalAttrs
    inlineLayoutAppearance.selected.titleTextAttributes = selectedAttrs

    let standardAppearance = UITabBarAppearance()
    standardAppearance.stackedLayoutAppearance = inlineLayoutAppearance
    standardAppearance.backgroundColor = .tabBarBackground
    standardAppearance.shadowImage = UIImage.imageWithColor(.orange, size: CGSize(width: 0.4, height: 0.4))
    tabBar.standardAppearance = standardAppearance
    if #available(iOS 15.0, *) {
        tabBar.scrollEdgeAppearance = standardAppearance
    }
} else {
    let tabBarItem = UITabBarItem.appearance()
    tabBarItem.setTitleTextAttributes(normalAttrs, for: .normal)
    tabBarItem.setTitleTextAttributes(selectedAttrs, for: .selected)
    UITabBar.appearance().backgroundColor = .tabBarBackground
    UITabBar.appearance().shadowImage = UIImage.imageWithColor(.seperator, size: CGSize(width: 0.4, height: 0.4))
}

[longitachi]

换成一张图片的方式了，用color转image的方式，小于1像素就会这样

[liweican1992]

shadowImage改成这样试试，应该就好了

appearance.shadowImage = UIImage.cyl_image(with: UIColor.black, size: CGSize.init(width:UIScreen.main.bounds.size.width, height: 1/UIScreen.main.scale))