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let listBtn = UIButton.init(type: .custom)
listBtn.frame = CGRect.init(x: 0, y: 0, width: dp(px: 12), height: dp(px: 14))
listBtn.setBackgroundImage(UIImage.init(named: "prepare_list"), for: .normal)
listBtn.addTarget(self, action: #selector(openStepList), for: .touchUpInside)
let item = UIBarButtonItem.init(customView: listBtn)
searchBtn.frame = CGRect.init(x: 0, y: 0, width: dp(px: 14), height: dp(px: 14))
searchBtn.setBackgroundImage(UIImage.init(named: "search"), for: .normal)
searchBtn.addTarget(self, action: #selector(FlightSafetyNoticeViewController.openSearchVc), for: .touchUpInside)
searchBtn.isHidden = true
//
let whiteBtn = UIButton()
whiteBtn.frame = CGRect.init(x: 0, y: 0, width: dp(px: 12), height: dp(px: 14))
let item2 = UIBarButtonItem.init(customView: searchBtn)
let item3 = UIBarButtonItem.init(customView: whiteBtn)
let items = [item,item3,item2]
self.navigationItem.rightBarButtonItems = items