共享扩展中图像调整大小崩溃

Question

我正在尝试在我的 ios 应用程序中实现共享扩展。我想分享照片，在应用程序将它们发送到后端之前我想调整照片的大小。 我正在使用这个功能：

+(UIImage*) resizedImage :(UIImage*) image andPreferredSize:(CGSize) size
{
    if(image.size.height > size.height && image.size.width > size.width)
    {
        float ratio1 = image.size.height/size.height;
        float ratio2 = image.size.width/size.width;
        float ratio3 = ratio1 < ratio2 ? ratio1 : ratio2;
        
        CGSize newSize =  CGSizeMake(image.size.width/ratio3 , image.size.height/ratio3);
        UIGraphicsBeginImageContextWithOptions(newSize, NO, 0.0);
        [image drawInRect:CGRectMake(0, 0, newSize.width, newSize.height)];
        UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();
        image = [[newImage retain] autorelease];
        UIGraphicsEndImageContext();        
    }
    
    return  image;
}

如果我在第二张照片中共享多张照片（在串行队列中），我会收到此消息错误并崩溃：

Message from debugger: Terminated due to memory issue

内存使用量不超过20 Mb。知道可能是什么问题吗？

Answer 1

这是我用来调整图像大小的代码。您很快就可以从中找到线索。

func resize(targetSize: CGSize) -> Data {      
    var actualHeight = Float(self.size.height)
    var actualWidth = Float(self.size.width)
    let maxHeight: Float = Float(targetSize.width)
    let maxWidth: Float = Float(targetSize.height)
    var imgRatio: Float = actualWidth / actualHeight
    let maxRatio: Float = maxWidth / maxHeight
    let compressionQuality: Float = 0.5
    //50 percent compression
    if actualHeight > maxHeight || actualWidth > maxWidth {
        if imgRatio < maxRatio {
            //adjust width according to maxHeight
            imgRatio = maxHeight / actualHeight
            actualWidth = imgRatio * actualWidth
            actualHeight = maxHeight
        }
        else if imgRatio > maxRatio {
            //adjust height according to maxWidth
            imgRatio = maxWidth / actualWidth
            actualHeight = imgRatio * actualHeight
            actualWidth = maxWidth
        }
        else {
            actualHeight = maxHeight
            actualWidth = maxWidth
        }
    }
    let rect = CGRect(x: 0.0, y: 0.0, width: CGFloat(actualWidth), height: CGFloat(actualHeight))
    UIGraphicsBeginImageContext(rect.size)
    self.draw(in: rect)
    let img = UIGraphicsGetImageFromCurrentImageContext()
    let imageData = img?.jpegData(compressionQuality: CGFloat(compressionQuality)) ?? Data()
    UIGraphicsEndImageContext()
    return imageData
    
}