IOS How to copy all image from resouce to documents folder

/* Copy all image from resouce to documents folder */
+ (void) copyAllImageFromResourceToDocuments {
   
    NSFileManager*manager = [NSFileManager defaultManager];
   
    NSString*dirToCopyTo = [NSHomeDirectory() stringByAppendingPathComponent:@"Documents"];
   
    NSString*path = [[NSBundle mainBundle] resourcePath];
   
    NSError *error;
   
    NSArray*files = [manager contentsOfDirectoryAtPath:path error:nil];
    NSArray *pngList = [files pathsMatchingExtensions:[NSArray arrayWithObject:@"png"]];
   
    for (NSString *file in pngList)    {
        [manager copyItemAtPath:[path stringByAppendingPathComponent:file] toPath:[dirToCopyTo stringByAppendingPathComponent:file] error:&error];

        if (error)        {
           // NSLog(@"%@",[error localizedDescription]);
        }
    }   
}

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