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;
}