硬盘容量获取

swift 3.0

let size = fileManager[FileAttributeKey.systemFreeSize] as! Double //文件系统的大小
        let freeSize  = fileManager[FileAttributeKey.systemFreeSize] as! Double
        freeSize.distance(to: 2)
        let sizeGB = size / 1024 / 1024 / 1024
        let freeSizeGB = freeSize / 1024 / 1024 / 1024
        let sizeGBstr = String(format: "%0.2f", sizeGB)
        let freeSizeGBstr = String(format: "%0.2f", freeSizeGB)
        diskSpace.text = "   系统总空间 \(sizeGBstr)G. 剩余可用 \(freeSizeGBstr)G"
        

swift 2.3

    func diskmessage(){
      let fileManager:NSDictionary = NSFileManager.defaultManager().attributesOfFileSystemForPath(NSHomeDirectory(), error: nil)!
        let size = fileManager.objectForKey(NSFileSystemSize) as Double //文件系统的大小
        let freeSize  = fileManager.objectForKey(NSFileSystemFreeSize) as Double
        freeSize.distanceTo(2)
        let sizeGB = size / 1024 / 1024 / 1024
        let freeSizeGB = freeSize / 1024 / 1024 / 1024
        let sizeGBstr = String(format: "%0.2f", sizeGB)//保留两位小数
        diskSpace.text = "   系统总空间 \(sizeGBstr)G. 剩余可用 \(freeSizeGB)G"
        //println("总大小\(size)空闲剩余\(freeSize)")

    }