*改变图像的尺寸，方便上传服务器

 * &-image 待传入UIImage

 * &-size 待传入UIImage要改变图像的尺寸

 * 返回处理好的UIImage

 */

+ (UIImage *)scaleFromImage:(UIImage *)image toSize:(CGSize)size;

/**

 * 改变图像的尺寸，方便上传服务器

 */

+ (UIImage *) scaleFromImage: (UIImage *) image toSize: (CGSize) size

{

    UIGraphicsBeginImageContext(size);

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

    UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();

    UIGraphicsEndImageContext();

   

return newImage;

}