如何将富文本粘贴到UITextView中？ [英] How to paste rich text into a UITextView?

问题描述

我的应用程序允许用户通过单击一些将属性应用于文本视图的attributedText属性的格式设置按钮来格式化UITextView中的文本。我想允许用户从一个UITextView复制其格式的文本，然后使用标准粘贴板和标准剪切/复制/粘贴菜单将其粘贴到另一个文本中。

My app allows users to format text in a UITextView by clicking some formatting buttons that apply attributes to the attributedText property of the text view. I want to allow users to copy their formatted text from one UITextView and paste it into another using the standard pasteboard and standard cut/copy/paste menu.

当前，如果我复制从UITextView格式化文本并将其粘贴到Mail应用程序中的新消息中，将保留格式-因此，将自动进行格式化文本的复制。但是，如果我将格式化后的文本粘贴到应用程序中的另一个UITextView中，则只会显示纯文本。

Currently if I copy formatted text from a UITextView and paste it into a new message in the Mail app, the formatting is preserved -- so the copying of formatted text is happening automatically. But if I paste the formatted text into another UITextView in my app, only the plain text appears.

请按照 iOS文本编程指南，我能够覆盖UITextView的粘贴方法并拦截粘贴的内容：

By following the "Pasting the Selection" section in the Text Programming Guide for iOS, I was able to override the paste method of UITextView and intercept the pasted content:

- (void)paste:(id)sender {
    UIPasteboard *pasteboard = [UIPasteboard generalPasteboard];
    NSLog(@"types available: %@", [pasteboard pasteboardTypes]);
    for (NSString *type in [pasteboard pasteboardTypes]) {
        NSLog(@"type %@ (%@): %@", type, NSStringFromClass([[pasteboard valueForPasteboardType:type] class]), [pasteboard valueForPasteboardType:type]);
    }
}

这向我显示粘贴板包含以下内容格式：com.apple.rtfd，public.rtf，public.text和 Apple Web Archive粘贴板类型。文本的值为纯文本字符串，rtf的值为RTF字符串，两种Apple格式的值为NSData。

This shows me that the pasteboard contains content in the following formats: com.apple.rtfd, public.rtf, public.text and "Apple Web Archive pasteboard type". The value for the text is a plain text string, the value for the rtf is an RTF string and the values for the two Apple formats are NSData.

卡住了。如何将这些项目之一从粘贴板数据转换为为UITextView设置的属性字符串？

This is where I'm stuck. How can I translate one of these items from the pasteboard data to an attributed string to set for the UITextView?

或者更好的是，有没有一种方法可以将UITextView配置为

Or better yet, is there a way to configure the UITextView to accept formatted text automatically when pasting, in the same way that it supplies formatted text automatically when copying?

推荐答案

邓肯在上面问：粘贴时自动接受格式化的文本，就像复制时自动提供格式化的文本一样。您确定已将uitextview设置为处理富文本。我不知道该设置是什么，但是我再次检查了UITextView类的引用，并找到了 allowsEditingTextAttributes 属性。我以前没有使用过它，因为我提供了自己的格式设置按钮，并且不需要启用系统的粗体/斜体/下划线选项。但是，当我将UITextView的属性设置为YES时，它便开始自动接受格式化的文本。哇！

Duncan asked above, "Are you sure you have the uitextview set to handle rich text." I wasn't aware of a setting for that, but I checked the UITextView class reference again and found the allowsEditingTextAttributes property. I hadn't used that before because I was providing my own formatting buttons and didn't need to enable the system Bold/Italic/Underline options. But when I set that property to YES for my UITextView, then it started accepting formatted text automatically. Whew!

这篇关于如何将富文本粘贴到UITextView中？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IT屋！