ios 获取系统容量

//获取系统容量及可使用容量
+(float)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];
        totalFreeSpace = [freeFileSystemSizeInBytes floatValue];
        NSLog(@"总容量 %f GB 可用容量 %f GB ", ((totalSpace/1024.0f)/1024.0f/1024.0f), ((totalFreeSpace/1024.0f)/1024.0f)/1024.0f);
    } else {

    }
    return totalFreeSpace;
}