UIImage和Base64格式图片相互转化!

//Base64图片 -> UIImage+ (UIImage *) dataURL2Image: (NSString *) imgSrc{    NSURL *url = [NSURL URLWithString: imgSrc];    NSData *data = [NSData dataWithContentsOfURL: url];    UIImage *image = [UIImage imageWithData: data];    return image;}//UIImage -> Base64图片+ (BOOL) imageHasAlpha: (UIImage *) image{    CGImageAlphaInfo alpha = CGImageGetAlphaInfo(image.CGImage);    return (alpha == kCGImageAlphaFirst ||            alpha == kCGImageAlphaLast ||            alpha == kCGImageAlphaPremultipliedFirst ||            alpha == kCGImageAlphaPremultipliedLast);}+ (NSString *) image2DataURL: (UIImage *) image{    NSData *imageData = nil;    NSString *mimeType = nil;    if ([self imageHasAlpha: image]) {        imageData = UIImagePNGRepresentation(image);        mimeType = @"image/png";    } else {        imageData = UIImageJPEGRepresentation(image, 1.0f);        mimeType = @"image/jpeg";    }    return [NSString stringWithFormat:@"data:%@;base64,%@", mimeType,            [imageData base64EncodedStringWithOptions: 0]];}