Swift:自定义搜索栏布局问题

Question

我尝试使用此 link 更新我的搜索栏但我即将遇到奇怪的布局问题。我目前的情况是这样的:

我想删除深灰色的角。我正在使用的代码是这样的:

        if #available(iOS 11.0, *) {
            let searchBar = searchController.searchBar
            if let textfield = searchBar.value(forKey: "searchField") as? UITextField {
                
                if let backgroundview = textfield.subviews.first {
                    
                    // Rounded corner
                    backgroundview.layer.cornerRadius = 2;
                    backgroundview.clipsToBounds = true;
                    
                    // Background color
                    backgroundview.backgroundColor = UIColor(red: 255.0/255.0, green: 255.0/255.0, blue: 255.0/255.0, alpha: 0.12)

                    //glass icon colour
                    if let glassIconView = textfield.leftView as? UIImageView{
                        glassIconView.image = glassIconView.image?.withRenderingMode(.alwaysTemplate)
                        glassIconView.tintColor = UIColor.white
                    }
                    
                    // Clear Button Customization
                    if let clearButton = textfield.value(forKey: "clearButton") as? UIButton {
                        clearButton.setImage(clearButton.imageView?.image?.withRenderingMode(.alwaysTemplate), for: .normal)
                        clearButton.tintColor = UIColor.white
                    }
                }
            }
            
            navigationItem.searchController = searchController
            navigationItem.hidesSearchBarWhenScrolling = false
        } else {
            
            tableView.tableHeaderView = searchController.searchBar
        }

请指出我方法中的错误。这是link对于最低限度的项目。

Answer 1

问题是backgroundview.backgroundColor。尝试将 alpha 设置为 1.0，如果设置 alpha < 1.0，则错误

backgroundview.backgroundColor = UIColor(red: 255.0/255.0, green: 255.0/255.0, blue: 255.0/255.0, alpha: 0.12)

你可以用浅灰色代替，看来你想要浅灰色。

backgroundview.backgroundColor = UIColor.lightGray