ios 向 UIBarButtonItem 添加自定义选择器
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Add a custom selector to a UIBarButtonItem
提问by Suchi
I am an iOS newbie. I have a navigation bar button which when clicked should execute a function of my own. What is the best way to do that?
我是iOS新手。我有一个导航栏按钮，单击该按钮时应执行我自己的功能。最好的方法是什么？
UIBarButtonItem *doneBarButtonItem=[[UIBarButtonItem alloc] init];
doneBarButtonItem.title=@"Done";
self.navigationItem.rightBarButtonItem = doneBarButtonItem;
[doneBarButtonItem release];
回答by bryanmac
One way is to init with the target and action:
一种方法是使用目标和操作进行初始化：
UIBarButtonItem *buttonHello = [[UIBarButtonItem alloc] initWithTitle:@"Say Hello"
style:UIBarButtonItemStyleBordered target:self action:@selector(sayHello:)];
Another way is to set the target and action after you created it
另一种方法是在创建后设置目标和操作
[buttonHello setTarget:self];
[buttonHello setAction:@selector(sayHello:)];
Target is the instance of the object that will get called. In the case of self, the method will be on this instance of the object.
Target 是将被调用的对象的实例。在 self 的情况下，方法将在对象的这个实例上。
Action is the method that will get called. Typically, you decorate it with IBAction to hint to the designer that it's an action. It compiles to void.
Action 是将被调用的方法。通常，您使用 IBAction 装饰它以提示设计者这是一个动作。它编译为无效。
- (IBAction)sayHello:(id)sender
{
// code here
}
回答by Luke
There's a variety of different init calls you can use, listed in the Instance Methods section here:
您可以使用各种不同的 init 调用，在此处的实例方法部分中列出：
- (id)initWithBarButtonSystemItem:(UIBarButtonSystemItem)systemItem target:(id)target action:(SEL)action
- (id)initWithCustomView:(UIView *)customView
- (id)initWithImage:(UIImage *)image style:(UIBarButtonItemStyle)style target:(id)target action:(SEL)action
- (id)initWithTitle:(NSString *)title style:(UIBarButtonItemStyle)style target:(id)target action:(SEL)action
Also, you can check out a sample in-use here:
此外，您可以在此处查看正在使用的示例：
How to set target and action for UIBarButtonItem at runtime
如何在运行时为 UIBarButtonItem 设置目标和操作
Hope this helps!
希望这可以帮助！
