在导航控制器中设置后退按钮的动作
UIBarButtonItem *backButton = [[UIBarButtonItem alloc] initWithTitle: @"Servers" style:UIBarButtonItemStylePlain target:self action:@selector(home)];self.navigationItem.backBarButtonItem = backButton;
leftBarButtonItemnavigationItem
self.navigationItem.leftBarButtonItem = backButton;
viewDidUnload
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