uiimage 和 uicolor 互转

 *  根据颜色和大小获取Image
 *
 *  @param color 颜色
 *  @param size  大小
 *
 */
+ (UIImage *)imageWithColor:(UIColor *)color size:(CGSize)size
{
    UIGraphicsBeginImageContextWithOptions(size, 0, [UIScreen mainScreen].scale);
    [color set];
    UIRectFill(CGRectMake(0, 0, size.width, size.height));
    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    return image;
}

UIColor *color = [UIColor colorWithPatternImage:[UIImageimageNamed:@"Background"]]