复制NSAttributedString中的UIPasteBoard

Question

如何在中复制NSAttributedString，以允许用户粘贴，或以编程方式粘贴(使用- (void)paste:(id)sender，从UIResponderStandardEditActions协议)。

我试过：

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

但这次坠机事件有：

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

这是预期的，因为NSAttributedString不是一个属性列表值。

如果用户在我的应用程序中粘贴了贴图板的内容，我希望保留属性字符串的所有标准和自定义属性。

Answer 1

我发现，当我(作为应用程序的用户)将富文本从UITextView复制到pasteboard中时，pasteboard包含两种类型：

"public.text",
"Apple Web Archive pasteboard type

基于此，我在UIPasteboard上创建了一个方便的类别。

(大量使用来自this answer的代码)。

它很有效，但：

转换为html格式意味着我将失去自定义属性。任何清洁的解决方案都将被欣然接受。。

文件UIPasteboard+AttributedString.h：

@interface UIPasteboard (AttributedString)

- (void) setAttributedString:(NSAttributedString *)attributedString;

@end

文件UIPasteboard+AttributedString.m：

#import <MobileCoreServices/UTCoreTypes.h>

#import "UIPasteboard+AttributedString.h"

@implementation UIPasteboard (AttributedString)

- (void) setAttributedString:(NSAttributedString *)attributedString {
    NSString *htmlString = [attributedString htmlString]; // This uses DTCoreText category NSAttributedString+HTML - https://github.com/Cocoanetics/DTCoreText
    NSDictionary *resourceDictionary = @{ @"WebResourceData" : [htmlString dataUsingEncoding:NSUTF8StringEncoding],
    @"WebResourceFrameName":  @"",
    @"WebResourceMIMEType" : @"text/html",
    @"WebResourceTextEncodingName" : @"UTF-8",
    @"WebResourceURL" : @"about:blank" };



    NSDictionary *htmlItem = @{ (NSString *)kUTTypeText : [attributedString string],
        @"Apple Web Archive pasteboard type" : @{ @"WebMainResource" : resourceDictionary } };

    [self setItems:@[ htmlItem ]];
}


@end

只实现了setter。如果您想编写getter，并/或将其放在GitHub上，请访问我的客人:)

Answer 2

清洁的解决方案是将NSAttributedString作为RTF (加上明文回退)插入粘贴板中，而不是涉及HTML：

- (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 {
        }
    }
}

Answer 3

这很简单：

  #import <MobileCoreServices/UTCoreTypes.h>

  NSMutableDictionary *item = [[NSMutableDictionary alloc] init];

  NSData *rtf = [attributedString dataFromRange:NSMakeRange(0, attributedString.length)
                             documentAttributes:@{NSDocumentTypeDocumentAttribute: NSRTFDTextDocumentType}
                                          error:nil];

  if (rtf) {
    [item setObject:rtf forKey:(id)kUTTypeFlatRTFD];
  }

  [item setObject:attributedString.string forKey:(id)kUTTypeUTF8PlainText];

  UIPasteboard *pasteboard = [UIPasteboard generalPasteboard];
  pasteboard.items = @[item];