SDWebImage3.6.4内存暴涨问题

• 原因： sd3.6.4 图片为高清或者 图片分辨率高的话sd根据图片分配的内存空间会很大，导致程序内存暴涨

• 解决方案

  • 当控制器内存到一定程度释放聂村重新加载
  • 修改sd

  •         //将等比压缩过的image在赋在转成data赋给self.imageData
    

  •         NSData *data = UIImageJPEGRepresentation(image, 1);
    

  •         self.imageData = [NSMutableData dataWithData:data];
    

  • +(UIImage *)compressImageWith:(UIImage *)image
  • {

  • float imageWidth = image.size.width;
    

  • float imageHeight = image.size.height;
    

  • float width = 640;
    

  • float height = image.size.height/(image.size.width/width);
    

• float widthScale = imageWidth /width;
  

• float heightScale = imageHeight /height;
  

  // 创建一个bitmap的context
  // 并把它设置成为当前正在使用的context
  UIGraphicsBeginImageContext(CGSizeMake(width, height));

  if (widthScale > heightScale) {
  [image drawInRect:CGRectMake(0, 0, imageWidth /heightScale , height)];
  }
  else {
  [image drawInRect:CGRectMake(0, 0, width , imageHeight /widthScale)];
  }

  // 从当前context中创建一个改变大小后的图片
  UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();
  // 使当前的context出堆栈
  UIGraphicsEndImageContext();

  return newImage;

}

else {
    image = [[UIImage alloc] initWithData:data];
    if (data.length/1024 > 128) {
        image = [self compressImageWith:image];
    }
    UIImageOrientation orientation = [self sd_imageOrientationFromImageData:data];
    if (orientation != UIImageOrientationUp) {
        image = [UIImage imageWithCGImage:image.CGImage