自定义导航返回按钮是用customView不可以的原因？

来源：互联网发布：广州行知职高编辑：程序博客网时间：2024/05/16 18:48

1、自定义返回按钮时，在父控制器viewController中如下设置：

    UIBarButtonItem *backbutton = [[UIBarButtonItem alloc]init];    backbutton.title = @"返回列表";    self.navigationItem.backBarButtonItem = backbutton;

2、当我们在创建UIBarButtonItem时，如果这样创建是没有效果的：

UIButton *btn = [UIButton buttonWithType:UIButtonTypeSystem];[btn setTitle:@"哈哈" forState:UIControlStateNormal];btn.frame = CGRectMake(0, 0, 40, 30);UIBarButtonItem *backItem = [[UIBarButtonItem alloc] initWithCustomView:btn];self.navigationItem.backBarButtonItem = backItem;[self.navigationController pushViewController:_testVC animated:YES];

为什么用[[UIBarButtonItem alloc] initWithCustomView:btn]创建不可以呢？查阅苹果官方文档说明：
Initializes a new item using the specified custom view.
The bar button item created by this method does not call the action method of its target in response to user interactions. Instead, the bar button item expects the specified custom view to handle any user interactions and provide an appropriate response.
原来此方法无法定义的UIBarButtonItem不能响应交互，就是用此方法创建的UIBarButtonItem会导致push过去的的backItem不能返回，所以苹果不允许在父控制器viewController中这样创建UIBarButtonItem来设置返回按钮；

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