我采用的是UISeachController

有以下几样自定义了

image-20200703232411687

取消按钮

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UIBarButtonItem.appearance(whenContainedInInstancesOf: [UISearchBar.self]).title = "取消"

背景颜色

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UITextField.appearance(whenContainedInInstancesOf: [UISearchBar.self]).backgroundColor = .white

文本颜色

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UITextField.appearance(whenContainedInInstancesOf: [UISearchBar.self]).defaultTextAttributes = [NSAttributedString.Key.foregroundColor: UIColor.orange]
//UITextField.appearance(whenContainedInInstancesOf: [UISearchBar.self]).textColor = .orange // 不起作用

Placeholder

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UITextField.appearance(whenContainedInInstancesOf: [UISearchBar.self]).attributedPlaceholder = NSAttributedString(string: "搜索个屁", attributes: [NSAttributedString.Key.foregroundColor: UIColor.yellow]) //颜色不起作用，但是对于普通UITextField起作用

放大镜颜色

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if let textfield = searchController.searchBar.value(forKey: "searchField") as? UITextField {
           if let leftView = textfield.leftView as? UIImageView {
               leftView.image = leftView.image?.withRenderingMode(.alwaysTemplate)
               leftView.tintColor = UIColor.red
           }
       }

补充

使用appearance方法时，如果重复入栈（重新打开页面）会失效，使用valueforkey更为保险，目前我的方案：

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if let textfield = searchController.searchBar.value(forKey: "searchField") as? UITextField {
            textfield.backgroundColor = .white
            textfield.placeholder = "搜索"
            textfield.attributedPlaceholder = NSAttributedString(string: "搜索", attributes: [NSAttributedString.Key.foregroundColor: UIColor.orange])
            if let leftView = textfield.leftView as? UIImageView {
                leftView.image = leftView.image?.withRenderingMode(.alwaysTemplate)
                leftView.tintColor = TColor.main
            }
        }