SearchBar简单展示

import UIKit

 

class SearchViewController: UIViewController,UISearchBarDelegate {

    let SCREEN_WIDTH = UIScreen.main.bounds.size.width

    let SCREEN_HEIGHT = UIScreen.main.bounds.size.height

    var topSearchBar:UISearchBar!

    override func viewDidLoad() {

        super.viewDidLoad()

        //初始化searchBar

        let topSearchBar = UISearchBar(frame: CGRect(x: 10, y: 5, width:SCREEN_WIDTH-80, height: 34))

        //移除搜索框的灰色背景

        for sv in topSearchBar.subviews {

            if sv.isKind(of: NSClassFromString("UIView")!) && sv.subviews.count>0{

                sv.subviews.first!.removeFromSuperview()

            }

        }

        topSearchBar.placeholder = "搜索商城商品                                             "

        //searchBar 协议

        topSearchBar.delegate = self

        //设置searchBar 边框宽度

        topSearchBar.layer.borderWidth = 1

        //设置searchBar 边框颜色

        topSearchBar.layer.borderColor = UIColor(red: 212/255, green: 212/255, blue: 212/255, alpha: 1.0).cgColor

        //搜索框父view

        let searchView = UIView(frame: CGRect(x: 0, y: 0, width: SCREEN_HEIGHT, height: 44))

        searchView.backgroundColor = UIColor.clear

        //searchBar放置到父view上面

        searchView.addSubview(topSearchBar)

        //view放到navigationItem主题上面

        self.navigationItem.titleView = searchView

    }

 

   

 

}