ios - 将图像上传到 AWS 压缩时间过长？

Question

所以我将我的 S3 存储桶设置为美国标准，但图像上传到存储桶大约需要 10-15 秒。现在想想，我猜是因为我没有压缩图像，而是将相机拍摄的图像存储到文件路径中，然后上传它。我想知道为了压缩图像我会使用 UIImageJPEGRepresentation，将 NSData 写入文件，然后将该文件上传到 S3 吗？或者有更好/不同的方式吗？或者，如果上传速度慢不是因为压缩，它是否恰好是为存储桶选择的区域？我不完全确定压缩图像是否会加快上传时间，但这可能是造成延迟的一个重要原因

Compress images to reduce file size

Answer 1

• 使用此方法压缩图片
• 像这样调用这个方法:

首先设置图片大小

CGSize newSize = CGSizeMake(200, 200);

* UIImage *profileImage = [AppManager resizeImageToSize:newSize image:croppedImage];

#pragma mark - resize Image ToSize
+ (UIImage *)resizeImageToSize:(CGSize)targetSize image:   (UIImage*)captureImage
{
  UIImage *sourceImage = captureImage;
  UIImage *newImage = nil;

  CGSize imageSize = sourceImage.size;
  CGFloat width = imageSize.width;
  CGFloat height = imageSize.height;

  CGFloat targetWidth = targetSize.width;
  CGFloat targetHeight = targetSize.height;

  CGFloat scaleFactor = 0.0;
  CGFloat scaledWidth = targetWidth;
  CGFloat scaledHeight = targetHeight;

  CGPoint thumbnailPoint = CGPointMake(0.0,0.0);

  if (CGSizeEqualToSize(imageSize, targetSize) == NO) {

    CGFloat widthFactor = targetWidth / width;
    CGFloat heightFactor = targetHeight / height;

    if (widthFactor < heightFactor)
      scaleFactor = widthFactor;
    else
      scaleFactor = heightFactor;

    scaledWidth  = width * scaleFactor;
    scaledHeight = height * scaleFactor;

    // make image center aligned
    if (widthFactor < heightFactor)
    {
      thumbnailPoint.y = (targetHeight - scaledHeight) * 0.5;
    }
    else if (widthFactor > heightFactor)
    {
      thumbnailPoint.x = (targetWidth - scaledWidth) * 0.5;
    }
  }

  UIGraphicsBeginImageContext(targetSize);
  CGRect thumbnailRect = CGRectZero;
  thumbnailRect.origin = thumbnailPoint;
  thumbnailRect.size.width  = scaledWidth;
  thumbnailRect.size.height = scaledHeight;

  [sourceImage drawInRect:thumbnailRect];
  newImage = UIGraphicsGetImageFromCurrentImageContext();
  UIGraphicsEndImageContext();

  if(newImage == nil)
      CCLogs(@"could not scale image");

  return newImage;
}