如何在 iphone 中向 uinavigationbar 添加条形按钮 [英] How to add bar button to uinavigationbar in iphone

问题描述

我的班级是一个普通的视图控制器，我通过 IB 添加了一个导航栏，我正在使用以下代码以编程方式将左侧的栏按钮项添加到导航栏

My class is a normal view controller and I added a navigation bar through IB and i am adding a barbutton item on left to the navigation bar programmatically using the following code

UIBarButtonItem *addButton1 = [[UIBarButtonItem alloc] initWithTitle:@"Start" style:UIBarButtonItemStylePlain target:self  action:@selector(tourBtnClicked:)];
 self.navigationItem.leftBarButtonItem = addButton1;       

但它不起作用......我应该以编程方式添加导航栏还是我的班级应该是一个 uinavigationcontroller

but its not working... should i add the navigationbar also programmatically or should my class a uinavigationcontroller

谢谢你

推荐答案

如果您没有使用 UINavigationController，您将需要添加代码来以编程方式管理导航栏.例如，您需要使用以下方法向导航栏发送消息以将导航项推入其堆栈:

If you're not using a UINavigationController, you will need to add code to manage the navigation bar programmatically. For example, you'd need to send a message to the navigation bar to push a navigation item onto its stack using the following method:

- (void)pushNavigationItem:(UINavigationItem *)item animated:(BOOL)animated

当您尝试设置其属性时，您还应该确保 navigationItem 属性当前不是 nil.来自 navigationItem 属性的 UIViewController 类参考:

You should also make sure the the navigationItem property isn't currently nil when you attempt to set its properties. From the UIViewController class reference for the navigationItem property:

确保导航项是已配置，您可以覆盖它属性并添加代码以加载栏按钮项目在那里或加载项目在您的视图控制器中初始化代码

To ensure the navigation item is configured, you can override this property and add code to load the bar button items there or load the items in your view controller’s initialization code

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