swift使用zlib框架compress/uncompress进行解压缩，示例代码如下，
func testDataCompression() {
let helloworld = "Hello"
let data = helloworld.data(using: .utf8)
// 压缩数据
var uncompressedSize = uLong(data?.count ?? 0)
var compressedSize = compressBound(uLong(data!.count))
var compressedData = Data(count: Int(compressedSize))
compressedData.withUnsafeMutableBytes { compressedBytes in
data!.withUnsafeBytes { uncompressedBytes in
compress(compressedBytes.baseAddress!.assumingMemoryBound(to: Bytef.self), &compressedSize, uncompressedBytes.baseAddress!.assumingMemoryBound(to: Bytef.self), uncompressedSize)
}
}
compressedData.count = Int(compressedSize)
print("压缩后的数据：\(compressedData)")
var uncompressedData = Data(count: Int(uncompressedSize))
let actualSize = uncompressedData.withUnsafeMutableBytes { uncompressedBytes in
compressedData.withUnsafeBytes { compressedBytes in
return uncompress(uncompressedBytes.baseAddress!.assumingMemoryBound(to: Bytef.self), &uncompressedSize, compressedBytes.baseAddress!.assumingMemoryBound(to: Bytef.self), uLong(compressedData.count))
}
}
if actualSize != Z_OK {
print("解压缩数据失败")
} else {
let uncompressedString = String(data: uncompressedData, encoding: .utf8)!
print("解压缩后的数据：\(uncompressedString)")
}
}
