//设置返回按钮
let backItem = UIBarButtonItem()
backItem.title = ""
self.navigationItem.backBarButtonItem = backItem
//设置返回按钮
let backItem = UIBarButtonItem()
backItem.title = ""
self.navigationItem.backBarButtonItem = backItem
本文标题：设置导航的返回按钮，之前都好麻烦的去设置。
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