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

}

}