iOS:获取存储空间及占用空间

获得单个文件的大小

/**
 获得单个文件的大小

 @param filePath 文件路径
 @return 单位(字节)
 */
- (long long) fileSizeAtPath:(NSString*) filePath{
    NSFileManager* manager = [NSFileManager defaultManager];
    if ([manager fileExistsAtPath:filePath]){
        return [[manager attributesOfItemAtPath:filePath error:nil] fileSize];
    }
    return 0;
}

 获得文件夹（遍历）的大小
/**
 获得文件夹（遍历）的大小
 @param folderPath 文件夹路径
 @return 单位(M)
 */
- (float ) folderSizeAtPath:(NSString*) folderPath{
    NSFileManager* manager = [NSFileManager defaultManager];
    if (![manager fileExistsAtPath:folderPath]) return 0;
    NSEnumerator *childFilesEnumerator = [[manager subpathsAtPath:folderPath] objectEnumerator];
    NSString* fileName;
    long long folderSize = 0;
    while ((fileName = [childFilesEnumerator nextObject]) != nil){
        NSString* fileAbsolutePath = [folderPath stringByAppendingPathComponent:fileName];
        folderSize += [self fileSizeAtPath:fileAbsolutePath];
    }
    return folderSize/(1024.0*1024.0);
}

根据上面的获得文件夹（遍历）的大小的方法, 可获取当前应用占用空间

    //获取当前应用的目录
    NSString *destPath = NSHomeDirectory();
    //计算目录占用的控件
    CGFloat AppFolderSize = [self folderSizeAtPath:destPath];

获取本地全部空间(去除系统占用大小)&剩余空间

/**
 获取硬盘空间及剩余可用空间
 */
-(void)getFreeDiskspace {
    float totalSpace;
    float totalFreeSpace;
    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]/1024.0f/1024.0f/1024.0f;
        totalFreeSpace = [freeFileSystemSizeInBytes floatValue]/1024.0f/1024.0f/1024.0f;
        NSLog(@"Memory Capacity of %f GB with %f GB Free memory available.", totalSpace, totalFreeSpace);
    } else {
        NSLog(@"Error Obtaining System Memory Info: Domain = %@, Code = %@", [error domain], [error code]);
    }  
}