/**
* @author [email protected]
*
* 把图片进行全新绘图 实现更改图片大小
*
* @param image 原始图片
* @param size 想要更改的大小
*
* @return 已更改过大小的图片
*/

- (UIImage*) OriginImage:(UIImage *)image scaleToSize:(CGSize)size
{
    UIGraphicsBeginImageContext(size);  //size 为CGSize类型，即你所需要的图片尺寸

    [image drawInRect:CGRectMake(0, 0, size.width, size.height)];

    UIImage* scaledImage = UIGraphicsGetImageFromCurrentImageContext();

    UIGraphicsEndImageContext();

    return scaledImage;   //返回的就是已经改变的图片
}

/**
* @author [email protected]
*
* 将图片绘制成圆形
*
*/

-(UIImage*) circleImage:(UIImage*) image withParam:(CGFloat) inset {
    UIGraphicsBeginImageContext(image.size);
    CGContextRef context = UIGraphicsGetCurrentContext();
    CGContextSetLineWidth(context, 2);
    CGContextSetStrokeColorWithColor(context, [UIColor orangeColor].CGColor);
    CGRect rect = CGRectMake(0, 0, image.size.width - inset * 2.0f, image.size.height - inset * 2.0f);
    CGContextAddEllipseInRect(context, rect);
    CGContextClip(context);

    [image drawInRect:rect];
    CGContextAddEllipseInRect(context, rect);
    CGContextStrokePath(context);
    UIImage *newimg = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    return newimg;
}