iOS 去掉navigationcontroller返回键文字

///去掉navigationController返回键文字

    self.navigationController.navigationBar.topItem.title = @“";

具体可以这样写：

- (void)viewWillAppear:(BOOL)animated

{

[super viewWillAppear:animated];

self.navigationController.navigationBar.topItem.title = @"";

}

- (void)viewWillDisappear:(BOOL)animated

{

[super viewWillDisappear:animated];

self.navigationController.navigationBar.topItem.title = @"上一级标题";

}