如何在swift 2.0中使用AttributesOfFileSystemForpaths获得总磁盘空间和可用磁盘空间

Question

这是我在Objective-C中使用的方式

-(uint64_t)getFreeDiskspace {
float totalSpace = 0;
float totalFreeSpace = 0;
NSError *error = nil;
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSDictionary *dictionary = [[NSFileManager defaultManager] attributesOfFileSystemForPath:[paths lastObject] error: &error];

if (dictionary) {
    NSNumber *fileSystemSizeInBytes = [dictionary objectForKey: NSFileSystemSize];
    NSNumber *freeFileSystemSizeInBytes = [dictionary objectForKey:NSFileSystemFreeSize];
    totalSpace = [fileSystemSizeInBytes floatValue];
    self.totalSpace = [NSString stringWithFormat:@"%.3f GB",totalSpace/(1024*1024*1024)];
    totalFreeSpace = [freeFileSystemSizeInBytes unsignedLongLongValue];
    self.freeSpace = [NSString stringWithFormat:@"%.3f GB",totalFreeSpace/(1024*1024*1024)];

} else {
    LogError(@"Error Obtaining System Memory Info: Domain = %@, Code = %ld", [error domain], (long)[error code]);
}

return totalFreeSpace;

}

我尝试将其转换为swift和

中的错误

if(dictionary)

和

attributesOfFileSystemForPaths 

显示。任何人都可以帮助我将其转换为swift 2.0？它会为我的项目做一个好的世界。提前谢谢。

Answer 1

更新Swift 3 @ Md.Muzahidul Islam

func getFreeSize() -> Int64? {
        let paths = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)
        if let dictionary = try? FileManager.default.attributesOfFileSystem(forPath: paths.last!) {
            if let freeSize = dictionary[FileAttributeKey.systemFreeSize] as? NSNumber {
                return freeSize.int64Value
            }
        }else{
            print("Error Obtaining System Memory Info:")
        }
        return nil
    }

    func getTotalSize() -> Int64?{
        let paths = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)
        if let dictionary = try? FileManager.default.attributesOfFileSystem(forPath: paths.last!) {
            if let freeSize = dictionary[FileAttributeKey.systemSize] as? NSNumber {
                return freeSize.int64Value
            }
        }else{
            print("Error Obtaining System Memory Info:")
        }
        return nil
    }

Answer 2

你可以这样使用

func getFreeSize() -> Int64? {
    let paths = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true)
    if let dictionary = try? NSFileManager.defaultManager().attributesOfFileSystemForPath(paths.last!) {
        if let freeSize = dictionary[NSFileSystemFreeSize] as? NSNumber {
            return freeSize.longLongValue
        }
    }else{
        print("Error Obtaining System Memory Info:")
    }
    return nil
}

func getTotalSize() -> Int64?{
    let paths = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true)
    if let dictionary = try? NSFileManager.defaultManager().attributesOfFileSystemForPath(paths.last!) {
        if let freeSize = dictionary[NSFileSystemSize] as? NSNumber {
            return freeSize.longLongValue
        }
    }else{
        print("Error Obtaining System Memory Info:")
    }
    return nil
}

现在将这些功能称为如下：

    if let total = getTotalSize(){
        print(total) // total disk space, use as you like
    }

    if let free = getFreeSize(){
        print(free) // free disk space, use as you like
    }

Answer 3

更新Swift-4

func getFreeDiskspace() -> Int64? {
        let paths = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)
        if let dictionary = try? FileManager.default.attributesOfFileSystem(forPath: paths.last!) {
            if let freeSize = dictionary[FileAttributeKey.systemFreeSize] as? NSNumber {
                return freeSize.int64Value
            }
        }else{
            print("Error Obtaining System Memory Info:")
        }
        return nil
    }

if let getFreespace = getFreeDiskspace() {
   print(getFreespace) // free disk space
}

Answer 4

已使用Swift 5.2（根据Vishal Vaghasiya的回答）更新了Result。

func getFreeDiskspace() -> Result<Int64, Error> {
    let paths = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)
    do {
        let dictionary = try FileManager.default.attributesOfFileSystem(forPath: paths.last!)
        let freeSize = dictionary[FileAttributeKey.systemFreeSize] as! Int64
        return Result.success(freeSize)
    } catch {
        return Result.failure(error)
    }
}