小编典典

Swift 3:设置Finder标签颜色

swift

我正在尝试设置取景器显示的彩色标签。我知道的唯一功能是setResourceValue。但这需要本地化名称!

我也可以想象自己的母语和英语,但我不知道其他所有人。我不敢相信,这应该是这样。

是are转换函数,它接受诸如enum或int的标准参数并提供本地化的颜色名称吗?

我参与其中,但是只支持两种语言(德语和英语):

let colorNamesEN = [ "None", "Gray", "Green", "Purple", "Blue", "Yellow", "Red", "Orange" ]
let colorNamesDE = [ "",     "Grau", "Grün",  "Lila",   "Blau", "Gelb",   "Rot", "Orange" ]

public enum TagColors : Int8 {
    case None = -1, Gray, Green, Purple, Blue, Yellow, Red, Orange, Max
}

//let theURL : NSURL = NSURL.fileURLWithPath("/Users/dirk/Documents/MyLOG.txt")

extension NSURL {
    // e.g.  theURL.setColors(0b01010101)
    func tagColorValue(tagcolor : TagColors) -> UInt16 {
        return 1 << UInt16(tagcolor.rawValue)
    }

    func addTagColor(tagcolor : TagColors) -> Bool {
        let bits : UInt16 = tagColorValue(tagcolor) | self.getTagColors()
        return setTagColors(bits)
    }

    func remTagColor(tagcolor : TagColors) -> Bool {
        let bits : UInt16 = ~tagColorValue(tagcolor) & self.getTagColors()
        return setTagColors(bits)
    }

    func setColors(tagcolor : TagColors) -> Bool {
        let bits : UInt16 = tagColorValue(tagcolor)
        return setTagColors(bits)
    }

    func setTagColors(colorMask : UInt16) -> Bool {
        // get string for all available and requested bits
        let arr = colorBitsToStrings(colorMask & (tagColorValue(TagColors.Max)-1))

        do {
            try self.setResourceValue(arr, forKey: NSURLTagNamesKey)
            return true
        }
        catch {
            print("Could not write to file \(self.absoluteURL)")
            return false
        }
    }

    func getTagColors() -> UInt16 {
        return getAllTagColors(self.absoluteURL)
    }
}


// let initialBits: UInt8 = 0b00001111
func colorBitsToStrings(colorMask : UInt16) -> NSArray {
    // translate bits to (localized!) color names
    let countryCode = NSLocale.currentLocale().objectForKey(NSLocaleLanguageCode)!

    // I don't know how to automate it for all languages possible!!!!
    let colorNames = countryCode as! String == "de" ? colorNamesDE : colorNamesEN

    var tagArray = [String]()
    var bitNumber : Int = -1   // ignore first loop
    for colorName in colorNames {
        if bitNumber >= 0 {
            if colorMask & UInt16(1<<bitNumber) > 0 {
                tagArray.append(colorName)
            }
        }
        bitNumber += 1
    }
    return tagArray
}


func getAllTagColors(file : NSURL) -> UInt16 {
    var colorMask : UInt16 = 0

    // translate (localized!) color names to bits
    let countryCode = NSLocale.currentLocale().objectForKey(NSLocaleLanguageCode)!
    // I don't know how to automate it for all languages possible!!!!
    let colorNames = countryCode as! String == "de" ? colorNamesDE : colorNamesEN
    var bitNumber : Int = -1   // ignore first loop

    var tags : AnyObject?

    do {
        try file.getResourceValue(&tags, forKey: NSURLTagNamesKey)
        if tags != nil {
            let tagArray = tags as! [String]

            for colorName in colorNames {
                if bitNumber >= 0 {
                    // color name listed?
                    if tagArray.filter( { $0 == colorName } ).count > 0 {
                        colorMask |= UInt16(1<<bitNumber)
                    }
                }
                bitNumber += 1
            }
        }
    } catch {
        // process the error here
    }

    return colorMask
}

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2020-07-07

共1个答案

小编典典

要设置单一颜色,setResourceValue确实应该使用API​​调用。但是,您应该使用的资源密钥是NSURLLabelNumberKeyURLResourceKey.labelNumberKey在Swift
3中(不是NSURLTagNamesKey):

enum LabelNumber: Int {
    case none
    case grey
    case green
    case purple
    case blue
    case yellow
    case red
    case orange
}

do {
    // casting to NSURL here as the equivalent API in the URL value type appears borked:
    // setResourceValue(_, forKey:) is not available there, 
    // and setResourceValues(URLResourceValues) appears broken at least as of Xcode 8.1…
    // fix-it for setResourceValues(URLResourceValues) is saying to use [URLResourceKey: AnyObject], 
    // and the dictionary equivalent also gives an opposite compiler error. Looks like an SDK / compiler bug. 
    try (fileURL as NSURL).setResourceValue(LabelNumber.purple.rawValue, forKey: .labelNumberKey)
}
catch {
    print("Error when setting the label number: \(error)")
}

(这是一个Swift 3端口,用于回答相关的Objective-C问题。已在Xcode 8.1,macOS Sierra
10.12.1上进行了测试)

要设置多种颜色,您可以使用通过标签键设置资源值时使用的API。此处介绍了这两种编码之间的区别:http
:
//arstechnica.com/apple/2013/10/os-x-10-9/9/
–基本上,标签键在内部设置了扩展属性“com.apple”。元数据:_kMDItemUserTags”,将这些标签字符串的数组存储为二进制plist,而上面显示的单色选项正在设置32字节长的扩展属性值“com.apple.FinderInfo”的第10个字节。

该键名称中的“本地化”在从用户设置的标签名称中实际设置的是用户选择的标签集的意义上有点混乱。这些标签值确实已本地化,但仅限于在您最初创建帐户时根据本地化设置进行设置的程度。为了演示,这些是Finder在我的系统上使用的标签值,我将其设置为芬兰语本地化作为测试,然后重新启动Finder,重新启动机器等:

➜  defaults read com.apple.Finder FavoriteTagNames
(
    "",
    Red,
    Orange,
    Yellow,
    Green,
    Blue,
    Purple,
    Gray
)

数据在该二进制plist值中的编码方式只是最喜欢的标记名称,后跟其在数组中的索引(固定为长度8,实际值从1开始,即按红色顺序匹配七个颜色,橙色,黄色,绿色,蓝色,紫色,灰色)。例如:

xattr -p com.apple.metadata:_kMDItemUserTags foobar.png | xxd -r -p | plutil -convert xml1 - -o -
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<array>
    <string>Gray
1</string>
    <string>Purple
3</string>
    <string>Green
2</string>
    <string>Red
6</string>
</array>
</plist>

因此,不考虑系统本地化,实际上,在标签中设置任何字符串,后跟一个换行符,再跟一个1–7之间的数字将在Finder中显示,并带有标签索引指示的颜色。但是,要知道正确的当前值以从收藏夹标签集中获取要应用的标签(以便颜色和标签匹配),则需要从Finder首选项(该键来自“
FavoriteTagNames”)中读取该键。域“ com.apple.Finder”,该编码对那些喜欢的标记名称的数组进行编码,如上所示)。

如果您想获得正确的标签名称
颜色,则需要忽略从Finder首选项域中读取的内容(取决于您的应用是否被沙盒化,这可能会或可能不会做),从而忽略上述麻烦。使用多种颜色,这是一个示例解决方案,可以直接使用扩展属性值设置颜色(我使用SOExtendedAttributes以避免麻烦的xattr
C API):

enum LabelNumber: Int {
    case none
    case gray
    case green
    case purple
    case blue
    case yellow
    case red
    case orange

    // using an enum here is really for illustrative purposes:
    // to know the correct values to apply you would need to read Finder preferences (see body of my response for more detail).
    var label:String? {
        switch self {
        case .none: return nil
        case .gray: return "Gray\n1"
        case .green: return "Green\n2"
        case .purple: return "Purple\n3"
        case .blue: return "Blue\n4"
        case .yellow: return "Yellow\n5"
        case .red: return "Red\n6"
        case .orange: return "Orange\n7"
        }
    }

    static func propertyListData(labels: [LabelNumber]) throws -> Data {
        let labelStrings = labels.flatMap { $0.label }
        let propData = try! PropertyListSerialization.data(fromPropertyList: labelStrings,
                                                           format: PropertyListSerialization.PropertyListFormat.binary,
                                                           options: 0)
        return propData
    }
}

do {
    try (fileURL as NSURL).setExtendedAttributeData(LabelNumber.propertyListData(labels: [.gray, .green]),
                                                     name: "com.apple.metadata:_kMDItemUserTags")
}
catch {
    print("Error when setting the label number: \(error)")
}
2020-07-07