文件来自目录文件夹

Question

我怎样才能从目录中的每个文件中获取日期？

let directoryContent = try fileManager.contentsOfDirectory(atPath: directoryURL.path)

这就是我从目录中获取文件的方式.我发现了一些方法:

directoryContent.Contains(...)

数据较旧的文件几天 - 我怎么检查它？

然后;

let fileAttributes = try fileManager.attributesOfItem(atPath: directoryURL.path)

它将在目录中给我最后一个文件.

这将以字节为单位返回日期:

for var i in 0..<directoryContent.count {
                let date = directoryContent.index(after: i).description.data(using: String.Encoding.utf8)!
                print(date)
            }

哪一个是从所有文件中恢复日期的最佳方法,或检查目录是否对比X时间早的特定日期.

提前致谢!

Answer 1

强烈建议使用URL相关的API FileManager以非常有效的方式获取文件属性.

此代码打印指定目录的所有URL,其创建日期早于一周前.

let calendar = Calendar.current
let aWeekAgo = calendar.date(byAdding: .day, value: -7, to: Date())!

do {
    let directoryContent = try fileManager.contentsOfDirectory(at: directoryURL, includingPropertiesForKeys: [.creationDateKey], options: [.skipsSubdirectoryDescendants, .skipsHiddenFiles])
    for url in directoryContent {
        let resources = try url.resourceValues(forKeys: [.creationDateKey])
        let creationDate = resources.creationDate!
        if creationDate < aWeekAgo {
            print(url)
            // do somthing with the found files
        }
    }
}
catch {
    print(error)
}

如果您希望更好地控制工作流,例如URL无效并且您想要打印错误的URL和相关错误但是继续使用枚举器进行其他URL的处理,则语法非常相似:

do {
    let enumerator = fileManager.enumerator(at: directoryURL, includingPropertiesForKeys: [.creationDateKey], options: [.skipsSubdirectoryDescendants, .skipsHiddenFiles], errorHandler: { (url, error) -> Bool in
        print("An error \(error) occurred at \(url)")
        return true
    })
    while let url = enumerator?.nextObject() as? URL {
        let resources = try url.resourceValues(forKeys: [.creationDateKey])
        let creationDate = resources.creationDate!
        if creationDate < last7Days {
            print(url)
            // do somthing with the found files
        }
    }

}
catch {
    print(error)
}