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我有一个文本视图，其中包含黑色和蓝色文本。现在我需要通过向每个文本添加特殊标记（__BLACK__ and __BLUE__）将其传递给服务器。因此，如果我的文字是，例如在下面的图像中

发送字符串应为__BLUE__Hi__/BLUE__ __BLACK__this__/BLACK__ __BLUE__is__/BLUE__ __BLACK__John__/BLACK__

所以，当我从服务器上取回它时，我可以识别哪些是黑色和蓝色，并为其应用属性。

目前，如果我打印属性字符串的描述，它将在下面显示

Hi {
    NSColor = "UIExtendedSRGBColorSpace 0 0 1 1";
    NSFont = "<UICTFont: 0x7ffbdfd10ce0> font-family: \".SFUIText\"; font-weight: normal; font-style: normal; font-size: 14.00pt";
    NSParagraphStyle = "Alignment 4, LineSpacing 0, ParagraphSpacing 0, ParagraphSpacingBefore 0, HeadIndent 0, TailIndent 0, FirstLineHeadIndent 0, LineHeight 0/0, LineHeightMultiple 0, LineBreakMode 0, Tabs (\n    28L,\n    56L,\n    84L,\n    112L,\n    140L,\n    168L,\n    196L,\n    224L,\n    252L,\n    280L,\n    308L,\n    336L\n), DefaultTabInterval 0, Blocks (\n), Lists (\n), BaseWritingDirection -1, HyphenationFactor 0, TighteningForTruncation NO, HeaderLevel 0";
}this {
    NSColor = "UIExtendedGrayColorSpace 0 1";
    NSFont = "<UICTFont: 0x7ffbdfd10ce0> font-family: \".SFUIText\"; font-weight: normal; font-style: normal; font-size: 14.00pt";
    NSParagraphStyle = "Alignment 4, LineSpacing 0, ParagraphSpacing 0, ParagraphSpacingBefore 0, HeadIndent 0, TailIndent 0, FirstLineHeadIndent 0, LineHeight 0/0, LineHeightMultiple 0, LineBreakMode 0, Tabs (\n    28L,\n    56L,\n    84L,\n    112L,\n    140L,\n    168L,\n    196L,\n    224L,\n    252L,\n    280L,\n    308L,\n    336L\n), DefaultTabInterval 0, Blocks (\n), Lists (\n), BaseWritingDirection -1, HyphenationFactor 0, TighteningForTruncation NO, HeaderLevel 0";
}is {
    NSColor = "UIExtendedSRGBColorSpace 0 0 1 1";
    NSFont = "<UICTFont: 0x7ffbdfd10ce0> font-family: \".SFUIText\"; font-weight: normal; font-style: normal; font-size: 14.00pt";
    NSParagraphStyle = "Alignment 4, LineSpacing 0, ParagraphSpacing 0, ParagraphSpacingBefore 0, HeadIndent 0, TailIndent 0, FirstLineHeadIndent 0, LineHeight 0/0, LineHeightMultiple 0, LineBreakMode 0, Tabs (\n    28L,\n    56L,\n    84L,\n    112L,\n    140L,\n    168L,\n    196L,\n    224L,\n    252L,\n    280L,\n    308L,\n    336L\n), DefaultTabInterval 0, Blocks (\n), Lists (\n), BaseWritingDirection -1, HyphenationFactor 0, TighteningForTruncation NO, HeaderLevel 0";
}John{
    NSColor = "UIExtendedGrayColorSpace 0 1";
    NSFont = "<UICTFont: 0x7ffbdfd10ce0> font-family: \".SFUIText\"; font-weight: normal; font-style: normal; font-size: 14.00pt";
    NSParagraphStyle = "Alignment 4, LineSpacing 0, ParagraphSpacing 0, ParagraphSpacingBefore 0, HeadIndent 0, TailIndent 0, FirstLineHeadIndent 0, LineHeight 0/0, LineHeightMultiple 0, LineBreakMode 0, Tabs (\n    28L,\n    56L,\n    84L,\n    112L,\n    140L,\n    168L,\n    196L,\n    224L,\n    252L,\n    280L,\n    308L,\n    336L\n), DefaultTabInterval 0, Blocks (\n), Lists (\n), BaseWritingDirection -1, HyphenationFactor 0, TighteningForTruncation NO, HeaderLevel 0";
}

如何识别哪个文本应标记为__BLACK__ and __BLUE__？