如何获得标准的iPhone复制气泡出现在UIImage？ [英] How can I get the standard iPhone Copy bubble to appear on a UIImage?

问题描述

在iPhoto中，我可以直接在图片上按住手指以获得复制弹出式窗口（例如您在文本框中看到的弹出式窗口）。

In iPhoto, I can simply hold my finger over an image to get a "Copy" popup (like the popup you see in text boxes).

UIImageView的，这不是这样的。如何启用？

In my UIImageView's, this is not the case. How can I enable it?

推荐答案

您可以使用 UIMenuController class 。例如，以下代码将显示以您的图片为中心的菜单：

You can manually display the Cut / Copy / Paste menu using the UIMenuController class. For example, the following code will display the menu, centered on your image:

[self becomeFirstResponder];

UIMenuController *copyMenuController = [UIMenuController sharedMenuController];

[copyMenuController setTargetRect:image.frame inView:self.view];
[copyMenuController setMenuVisible:YES animated:YES];

这假设您将在 UIViewController

This assumes that you'll be implementing this code in a UIViewController for the view that hosts your image.

要启用各种菜单项，还需要在控制器中实现几个委托方法：

To enable the various menu items, you'll also need to implement a few delegate methods in your controller:

- (BOOL)canPerformAction:(SEL)action withSender:(id)sender 
{   
    if (action == @selector(cut:))
        return NO;
    else if (action == @selector(copy:))
        return YES;
    else if (action == @selector(paste:))
        return NO;
    else if (action == @selector(select:) || action == @selector(selectAll:)) 
        return NO;
    else
        return [super canPerformAction:action withSender:sender];
}

- (BOOL)canBecomeFirstResponder 
{
    return YES;
}

在这种情况下，只会启用复制菜单选项。您还需要实现相应的-copy：方法来处理用户选择该菜单项时会发生什么。

In this case, only the Copy menu option will be enabled. You'll also need to implement the appropriate -copy: method to handle what happens when the user selects that menu item.

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