是否存在与Java包中包含的类等效的Objective-C类java.util.zip
?
是执行CLI命令的唯一选择吗?
从iOS8 / OSX10.10开始,使用的内置方法来创建zip存档NSFileCoordinatorReadingOptions.ForUploading
。一个不带任何非可可依赖项的创建zip存档的简单示例:
public extension NSURL {
/// Creates a zip archive of the file/folder represented by this URL and returns a references to the zipped file
///
/// - parameter dest: the destination URL; if nil, the destination will be this URL with ".zip" appended
func zip(dest: NSURL? = nil) throws -> NSURL {
let destURL = dest ?? self.URLByAppendingPathExtension("zip")
let fm = NSFileManager.defaultManager()
var isDir: ObjCBool = false
let srcDir: NSURL
let srcDirIsTemporary: Bool
if let path = self.path where self.fileURL && fm.fileExistsAtPath(path, isDirectory: &isDir) && isDir.boolValue == true {
// this URL is a directory: just zip it in-place
srcDir = self
srcDirIsTemporary = false
} else {
// otherwise we need to copy the simple file to a temporary directory in order for
// NSFileCoordinatorReadingOptions.ForUploading to actually zip it up
srcDir = NSURL(fileURLWithPath: NSTemporaryDirectory()).URLByAppendingPathComponent(NSUUID().UUIDString)
try fm.createDirectoryAtURL(srcDir, withIntermediateDirectories: true, attributes: nil)
let tmpURL = srcDir.URLByAppendingPathComponent(self.lastPathComponent ?? "file")
try fm.copyItemAtURL(self, toURL: tmpURL)
srcDirIsTemporary = true
}
let coord = NSFileCoordinator()
var error: NSError?
// coordinateReadingItemAtURL is invoked synchronously, but the passed in zippedURL is only valid
// for the duration of the block, so it needs to be copied out
coord.coordinateReadingItemAtURL(srcDir, options: NSFileCoordinatorReadingOptions.ForUploading, error: &error) { (zippedURL: NSURL) -> Void in
do {
try fm.copyItemAtURL(zippedURL, toURL: destURL)
} catch let err {
error = err as NSError
}
}
if srcDirIsTemporary { try fm.removeItemAtURL(srcDir) }
if let error = error { throw error }
return destURL
}
}
public extension NSData {
/// Creates a zip archive of this data via a temporary file and returns the zipped contents
func zip() throws -> NSData {
let tmpURL = NSURL(fileURLWithPath: NSTemporaryDirectory()).URLByAppendingPathComponent(NSUUID().UUIDString)
try self.writeToURL(tmpURL, options: NSDataWritingOptions.DataWritingAtomic)
let zipURL = try tmpURL.zip()
let fm = NSFileManager.defaultManager()
let zippedData = try NSData(contentsOfURL: zipURL, options: NSDataReadingOptions())
try fm.removeItemAtURL(tmpURL) // clean up
try fm.removeItemAtURL(zipURL)
return zippedData
}
}
很好,但是反过来呢?也就是说,拥有一个zip文件,然后像读取目录一样读取其内容?
我看了一下,但找不到其他类似的方法。我赞成这个答案,因为它很棒。但是,在我的Mac应用程序中,我改用NSTask来调用/ usr / bin / zip和/ usr / bin / unzip。它很简单,提供了许多文档化的选项来控制行为,在我的情况下,所需的代码少于此。
为什么这种方法没有更广泛地使用?内置解决方案,不需要维护任何额外的库,非常完美。将其“转换”为目标c,它似乎也起作用。