- (UIImage *)reSizeImage:(UIImage *)image toSize:(CGSize)reSize{    UIGraphicsBeginImageContext(CGSizeMake(reSize.width, reSize.height));    [image drawAsPatternInRect:(CGRectMake(0, 0, reSize.width, reSize.height))];    UIImage *reSizeImage = UIGraphicsGetImageFromCurrentImageContext();    UIGraphicsEndImageContext();    return reSizeImage;    }

//调用方法

cell.imageView.image=[self reSizeImage:cell.imageView.image toSize:CGSizeMake(25, 20)];