swift-xattr文件属性处理功能扩展
swift-xattr 是 iOS/OSX Swift 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 Foundation
var errorOrNames = attributesNamesAtPath("/file.txt")
if let names = errorOrNames.names {
names.map { println($0) }
}
else {
println(errorOrNames.error)
}
> com.apple.FinderInfo
> com.apple.metadata:_kMDItemUserTags
setAttributeWithName("custom", data: "abc".dataUsingEncoding(NSUTF8StringEncoding, allowLossyConversion: false)!, atPath: "/file.txt")
errorOrNames = attributesNamesAtPath("/file.txt")
if let names = errorOrNames.names {
names.map { println($0) }
}
else {
println(errorOrNames.error)
}
> com.apple.FinderInfo
> com.apple.metadata:_kMDItemUserTags
> custom
var errorOrData = dataForAttributeNamed("custom", atPath: "/file.txt")
if let data = errorOrData.data {
println(NSString(data: data, encoding: NSUTF8StringEncoding))
}
else {
println(errorOrData.error)
}
> abc
removeAttributeNamed("custom", atPath: "/file.txt")
errorOrData = dataForAttributeNamed("custom", atPath: "/file.txt")
if let data = errorOrData.data {
println(NSString(data: data, encoding: NSUTF8StringEncoding))
}
else {
println(errorOrData.error)
}
> Attribute not found
测试系统：Xcode 6.3, iOS 8.1.1, OS X 10.10
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