IOS等比率缩放图片 工具function

//图片等比率缩放，scaleSize填写缩放比率- (UIImage *)scaleImage:(UIImage *)image toScale:(float)scaleSize {    UIGraphicsBeginImageContext(CGSizeMake(image.size.width * scaleSize, image.size.height * scaleSize));                                [image drawInRect:CGRectMake(0, 0, image.size.width * scaleSize, image.size.height * scaleSize)];                                UIImage *scaledImage = UIGraphicsGetImageFromCurrentImageContext();                                UIGraphicsEndImageContext();                                                                return scaledImage;}