我一直在自定义带有中心圆形按钮的标签栏，还设置了圆角半径曲线，我在情节提要中进行了如下设置，

我已经将图像渲染为原始图像，但是我的问题是，当我在模拟器中运行时，圆角的上半部丢失了，如图所示，

我已经为UITabBar设置了类，

class ProminentTabBar: UITabBar {
    var prominentButtonCallback: (()->())?
    
    override func hitTest(_ point: CGPoint,with event: UIEvent?) -> UIView? {
        guard let items = items,items.count>0 else {
            return super.hitTest(point,with: event)
        }
        
        let middleItem = items[items.count/2]
        let middleExtra = middleItem.imageInsets.top
        let middleWidth = bounds.width/CGFloat(items.count)
        let middleRect = CGRect(x: (bounds.width-middleWidth)/2,y: middleExtra,width: middleWidth,height: abs(middleExtra))
        if middleRect.contains(point) {
            prominentButtonCallback?()
            return nil
        }
        return super.hitTest(point,with: event)
    }
}

和tabbarcontroller也在行下方添加了

override func viewDidLoad() {
    super.viewDidLoad()
    
    let prominentTabBar = self.tabBar as! ProminentTabBar
    prominentTabBar.prominentButtonCallback = prominentTabTaped
}

func prominentTabTaped() {
    selectedIndex = (tabBar.items?.count ?? 0)/2
}

此来源来自堆栈溢出票证：-How do we create a bigger center UITabBar Item

有人对此有解决方案吗？