Crop to keep bottom part of UIImage

CropBottomPart

- (UIImage *)cropImage:(UIImageView *)image {
    UIGraphicsBeginImageContext(CGSizeMake(320, 64));
    CGContextRef context = UIGraphicsGetCurrentContext();
    CGContextTranslateCTM(context, 0, -image.frame.size.height + 64);
    [image.layer renderInContext:context];
    UIImage *subImage = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();

    return subImage;
}