swift-xattr是iOS/OSXSwift语言的可扩展文件属性封装器，可处理下列函数：setxattr,getxattr,listxattr,removexattr。
使用示例：
import Foudatiovar errorOrNames = attributesNamesAtPath("/file.txt")if let ames = errorOrNames.ames { ames.map { pritl($0) }}else { pritl(errorOrNames.error)}> com.apple.FiderIfo> com.apple.metadata:_kMDItemUserTagssetAttributeWithName("custom", data: "abc".dataUsigEcodig(NSUTF8StrigEcodig, allowLossyCoversio: false)!, atPath: "/file.txt")errorOrNames = attributesNamesAtPath("/file.txt")if let ames = errorOrNames.ames { ames.map { pritl($0) }}else { pritl(errorOrNames.error)}> com.apple.FiderIfo> com.apple.metadata:_kMDItemUserTags> customvar errorOrData = dataForAttributeNamed("custom", atPath: "/file.txt")if let data = errorOrData.data { pritl(NSStrig(data: data, ecodig: NSUTF8StrigEcodig))}else { pritl(errorOrData.error)}> abcremoveAttributeNamed("custom", atPath: "/file.txt")errorOrData = dataForAttributeNamed("custom", atPath: "/file.txt")if let data = errorOrData.data { pritl(NSStrig(data: data, ecodig: NSUTF8StrigEcodig))}else { pritl(errorOrData.error)}> Attribute ot foud测试系统：Xcode6.3,iOS8.1.1,OSX10.10
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