建议判断一下 isTranslucent 再增加progressView

[bulolo]

if(self.navigationController?.navigationBar.isTranslucent == true){
       progressView?.frame = CGRect(x: 0, y: 64, width: view.bounds.size.width, height: 3)
}else{
       progressView?.frame = CGRect(x: 0, y: 0, width: view.bounds.size.width, height: 3)
}