[iOS]UIImageをリサイズする

+ (UIImage *)resize:(UIImage *)image rect:(CGRect)rect
{
    UIGraphicsBeginImageContext(rect.size);
    [image drawInRect:rect];
    UIImage* resizedImage = UIGraphicsGetImageFromCurrentImageContext();
    CGContextRef context = UIGraphicsGetCurrentContext();
    CGContextSetInterpolationQuality(context, kCGInterpolationHigh);
    UIGraphicsEndImageContext();
    return resizedImage;
}