Swift 3:设置Finder标签颜色

问题描述 投票:5回答:4

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

我可以想象我的母语和英语,但我不知道所有其他人。我不敢相信,这应该是这样的。

是转换函数,它采用像enum或int这样的标准参数并提供本地化的颜色名称?

我有一个运行的部分,但只有两种语言(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
}
swift macos cocoa label finder
4个回答
2
投票

历史

首先是我之前的答案,它适用于将一个颜色标签设置为文件:https://stackoverflow.com/a/39751001/2227743

然后@mz2发布了这个优秀的答案,成功地将几个颜色标签设置到一个文件并解释了这个过程:https://stackoverflow.com/a/40314367/2227743

现在这个小插件,一个简单的follow-up到@ mz2的答案。

我简单地实现了@ mz2的建议:我已经使用获取Finder首选项的方法扩展了他的枚举示例,并在将属性设置到文件之前提取了正确的本地化标签颜色名称。

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

    func label(using list: [String] = []) -> String? {
        if list.isEmpty || list.count < 7 {
            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"
            }
        } else {
            switch self {
            case .none: return nil
            case .gray: return list[0]
            case .green: return list[1]
            case .purple: return list[2]
            case .blue: return list[3]
            case .yellow: return list[4]
            case .red: return list[5]
            case .orange: return list[6]
            }
        }
    }

    static func set(colors: [LabelColors],
                    to url: URL,
                    using list: [String] = []) throws
    {
        // 'setExtendedAttributeData' is part of https://github.com/billgarrison/SOExtendedAttributes
        try (url as NSURL).setExtendedAttributeData(propertyListData(labels: colors, using: list),
                                                    name: "com.apple.metadata:_kMDItemUserTags")
    }

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

    static func localizedLabelNames() -> [String] {
        // this doesn't work if the app is Sandboxed:
        // the users would have to point to the file themselves with NSOpenPanel
        let url = URL(fileURLWithPath: "\(NSHomeDirectory())/Library/SyncedPreferences/com.apple.finder.plist")

        let keyPath = "values.FinderTagDict.value.FinderTags"
        if let d = try? Data(contentsOf: url) {
            if let plist = try? PropertyListSerialization.propertyList(from: d,
                                                                       options: [],
                                                                       format: nil),
                let pdict = plist as? NSDictionary,
                let ftags = pdict.value(forKeyPath: keyPath) as? [[AnyHashable: Any]]
            {
                var list = [(Int, String)]()
                // with '.count == 2' we ignore non-system labels
                for item in ftags where item.values.count == 2 {
                    if let name = item["n"] as? String,
                        let number = item["l"] as? Int {
                        list.append((number, name))
                    }
                }
                return list.sorted { $0.0 < $1.0 }.map { "\($0.1)\n\($0.0)" }
            }
        }
        return []
    }
}

用法:

do {
    // default English label names
    try LabelColors.set(colors: [.yellow, .red],
                        to: fileURL)

    // localized label names
    let list = LabelColors.localizedLabelNames()
    try LabelColors.set(colors: [.green, .blue],
                        to: fileURL,
                        using: list)
} catch {
    print("Error when setting label color(s): \(error)")
}

4
投票

由于新的URLResourceValues()结构和标签号,我得到了它,而不必知道颜色名称。

知道每个标签号代表标签颜色:

0无 1格雷 2绿色 3紫色 4蓝色 5黄色 6红色 7橙色

制作文件的网址:

var url = URL(fileURLWithPath: pathToYourFile)

它必须是var,因为我们要改变它。

创建一个新的URLResourceValues实例(也需要是一个变量):

var rv = URLResourceValues()

设置标签号如下:

rv.labelNumber = 2 // green

最后,将标记写入文件:

do {
    try url.setResourceValues(rv)
} catch {
    print(error.localizedDescription)
}

在我们的示例中,我们将数字标记设置为2,因此此文件标记为绿色。


4
投票

要设置单一颜色,setResourceValue API调用确实是您应该使用的。但是,您应该使用的资源键是NSURLLabelNumberKey,或者Swift 3中的URLResourceKey.labelNumberKey(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an answer to a related Objective-C question的Swift 3端口。使用Xcode 8.1测试,macOS Sierra 10.12.1)

要设置多种颜色,您可以使用您在设置资源值时使用的API和标签键。这里描述了这两种编码之间的区别:http://arstechnica.com/apple/2013/10/os-x-10-9/9/ - 基本上标签键是在内部设置扩展属性“com.apple.metadata:_kMDItemUserTags”,它将这些标签字符串的数组存储为二进制plist,而单一颜色选项则显示上面是设置32字节长扩展属性值“com.apple.FinderInfo”的第10个字节。

该密钥名称中的“本地化”有点令人困惑,因为实际设置的是用户在用户设置的标签名称中选择的标签集。这些标签值确实是本地化的,但仅限于最初创建帐户时根据本地化设置设置的范围。为了演示,这些是Finder在我的系统上使用的标签值,我将其设置为芬兰本地化作为测试并重新启动Finder,重启机器等:

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

数据在二进制plist值中编码的方式只是最喜欢的标记名称,后跟数组中的索引(固定为长度为8,实际值从1开始,即匹配红色顺序中的七种颜色,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,系统本地化不会被考虑在内,事实上,使用任何字符串后跟换行设置标签,然后在1-7之间设置一个数字,将在Finder中显示标签索引指示的颜色。但是,要知道要应用的正确当前值以从最喜欢的标签集中应用标签(这样颜色和标签都匹配),您需要从Finder首选项中读取该键(键入'FavoriteTagNames'来自domain'com.apple.Finder',它编码一组最喜欢的标签名称,如上所示)。

如果您想要获取标签名称和颜色正确,请忽略上述复杂情况,需要从Finder首选项域(您可能会或可能不会这样做,取决于您的应用程序是否为沙盒),如果您希望使用多种颜色,这是一个直接使用扩展属性值设置颜色的示例解决方案(我使用SOExtendedAttributes来避免触及笨重的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)")
}

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