iOS - 检测用户何时复制到剪贴板 - [UIPasteboard generalPasteboard] [英] iOS - detect when user copy to clipboard - [UIPasteboard generalPasteboard]

问题描述

快速简单的问题

在使用带有一些文字的WebView时 - 用户可以从中选择一段文本
并按下UIButton我创建 - 运行以下操作：

while using a WebView with some text in it - the user can select a snippet of text from it and press a UIButton which I created - running the following action:

-(IBAction)copyToClip
{
    NSString *copyClip = [UIPasteboard generalPasteboard].string;
    NSLog(@"Clip = %@",copyClip);
    // (works fine)
}

我想打电话给没有UIButton的相同功能，因此当用户执行复制操作时，它将激活上述代码。 （我假设有一个听众）

I would like to call the same function without a UIButton, thus when the user did a "copy" action it will activate the above code. (I assume a listener)

这对于什么是合适的听众？

what would be the appropriate listener for this?

推荐答案

使用NSNotificationCenter并注册UIPasteboardChangedNotification：
http://developer.apple.com/library/IOs/documentation/UIKit/Reference/UIPasteboard_Class/Reference.html#//apple_ref/c/data/UIPasteboardChangedNotification

Use NSNotificationCenter and register for UIPasteboardChangedNotification: http://developer.apple.com/library/IOs/documentation/UIKit/Reference/UIPasteboard_Class/Reference.html#//apple_ref/c/data/UIPasteboardChangedNotification

[[NSNotificationCenter defaultCenter] addObserver:object selector:@selector(copyToClip) name:UIPasteboardChangedNotification object:nil];

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