本文介绍了为 UIBarButtonItem 添加/删除 EventHandler的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
可以在构造函数中定义一个EventHandler
:
One can define an EventHandler
in the constructor:
UIBarButtonItem logoutButton = new UIBarButtonItem (UIBarButtonSystemItem.Stop, logoutButtonEventHandler);
private void logoutButtonEventHandler(object sender, EventArgs args){
Console.WriteLine("Logout");
}
之后是否可以删除EventHandler
?也许根本不使用 EventHandler
而是使用 ?我没有找到任何例子.始终只使用匿名方法.
Is it possible to remove the EventHandler
afterwards? Perhaps by not using an EventHandler
at all and instead use the Action
/Target
properties of UIBarButtonItem
? I don't find any examples. Only anonymous methods are used all the time.
你是怎么做到的?
推荐答案
实例化你的对象,然后设置处理程序:
Instantiate your object and then set the handler:
var logoutButton = new UIBarButtonItem (UIBarButtonSystemItem.Stop)
logoutButton.Clicked += logoutButtonEventHandler;
要在之后删除它,请使用 -=
语法:
To remove it afterwards use the -=
syntax:
logoutButton.Clicked -= logoutButtonEventHandler;
请注意常见的陷阱 当你这样做是因为它们可能会导致内存泄漏.
Just beware of commom pitfalls when you do so because they may cause memory leaks.
这篇关于为 UIBarButtonItem 添加/删除 EventHandler的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持!