计算目录大小 stat 和 fileManager

// 计算目录大小    速度稍快一点

func folderSizeAtPath(_ path:String) -> Float{      

  let fileManager = Foundation.FileManager.default;      

  var folderSize:Float = 0      

  if fileManager.fileExists(atPath: path){           

 let childerFiles = fileManager.subpaths(atPath: path)           

 for fileName in childerFiles!  {                

let absolutePath = (path as NSString).appendingPathComponent(fileName);         

       var statadd = stat.init()          

      let cs = (absolutePath as NSString).utf8String             

   var buffer = UnsafeMutablePointer(mutating: cs)

stat(buffer, &statadd)

TLog.v(statadd.st_size)

//folderSize += self.fileSizeAtPath(absolutePath)

folderSize += Float(statadd.st_size) / 1024.0 / 1024.0

}

}

return folderSize;

}

// 计算目录大小 速度一般

func folderSizeAtPath(_ path:String) -> Float{

let fileManager = Foundation.FileManager.default;

var folderSize:Float = 0

if fileManager.fileExists(atPath: path){

let childerFiles = fileManager.subpaths(atPath: path)

for fileName in childerFiles!  {

let absolutePath = (path as NSString).appendingPathComponent(fileName);

folderSize += self.fileSizeAtPath(absolutePath)

}

}

return folderSize;

}

// 计算单个文件大小

func fileSizeAtPath(_ path:String) -> Float{

let fileManager = Foundation.FileManager.default;

let dict:NSDictionary;

if fileManager.fileExists(atPath: path) {

do {

dict = try fileManager.attributesOfItem(atPath: path) as NSDictionary;

let size:UInt64 = dict.fileSize();

return Float(size) / 1024.0 / 1024.0;

}

catch let error {

TLog.v(error);

}

}

return 0.0

}

文件内容很大的推荐做法

https://github.com/Haneke/HanekeSwift/blob/master/Haneke/DiskCache.swift