在 UIPasteBoard 中复制 NSAttributedString

如何在粘贴板中复制 NSAttributedString，允许用户粘贴或以编程方式粘贴（使用- (void)paste:(id)sender，来自 UIResponderStandardEditActions 协议）。

I tried:

UIPasteboard *pasteBoard = [UIPasteboard generalPasteboard];
[pasteBoard setValue:attributedString forPasteboardType:(NSString *)kUTTypeRTF];

但这次崩溃：

-[UIPasteboard setValue:forPasteboardType:]: value is not a valid property list type'

这是可以预料的，因为 NSAttributedString 不是属性列表值。

如果用户将粘贴板的内容粘贴到我的应用程序中，我想保留属性字符串的所有标准和自定义属性。

干净的解决方案不是涉及 HTML，而是将 NSAttributedString 作为 RTF（加上纯文本后备）插入粘贴板：

- (void)setAttributedString:(NSAttributedString *)attributedString {
    NSData *rtf = [attributedString dataFromRange:NSMakeRange(0, attributedString.length)
                               documentAttributes:@{NSDocumentTypeDocumentAttribute: NSRTFTextDocumentType}
                                            error:nil];
    self.items = @[@{(id)kUTTypeRTF: [[NSString alloc] initWithData:rtf encoding:NSUTF8StringEncoding],
                     (id)kUTTypeUTF8PlainText: attributedString.string}];
}

Swift 5

import MobileCoreServices

public extension UIPasteboard {
    func set(attributedString: NSAttributedString) {
        do {
            let rtf = try attributedString.data(from: NSMakeRange(0, attributedString.length), documentAttributes: [NSAttributedString.DocumentAttributeKey.documentType: NSAttributedString.DocumentType.rtf])
            items = [[kUTTypeRTF as String: NSString(data: rtf, encoding: String.Encoding.utf8.rawValue)!, kUTTypeUTF8PlainText as String: attributedString.string]]
        } catch {
        }
    }
}