ios - 尝试从手机库中选择全景图像时 UIImagePickerController 崩溃

Question

我正在尝试使用 UIImagePickerController 从设备库中选择一个图像，一切正常，除非我选择一个非常大的图像(全景图像)，应用程序崩溃而没有留下任何痕迹。我认为这是一个内存问题(我注意到内存使用量增加到 600m)。所以我的问题是我可以指定图像大小作为过滤器吗？或者我应该创建我的自定义图像选择器？我还使用 facebook 和 twitter 图像选择器测试了相同的图像:twitter 失败 ...

我的代码启动图像选择器是:

var picker = UIImagePickerController()
picker.delegate = self
picker.sourceType = .PhotoLibrary
presentViewController(self.picker, animated: true, completion: nil)

并捕获选定的图像:

extension MYViewController : UIImagePickerControllerDelegate,UINavigationControllerDelegate{
    func imagePickerController(
    picker: UIImagePickerController,
    didFinishPickingMediaWithInfo info: [String : AnyObject])
    {
        print("user did select an image")
        let chosenImage = info[UIImagePickerControllerOriginalImage] as! UIImage

        dismissViewControllerAnimated(true, completion: nil)

    }
    func imagePickerControllerDidCancel(picker: UIImagePickerController) {
        //do code when cancel
        print("cancel ...")
        userDidCancelImageChoosing = true
        dismissViewControllerAnimated(true, completion: nil)
    }
}

编辑:我检查了视频持续时间的问题，但这不是我需要的，我们没有同样的问题，这里我谈谈从图像选择器中选择图像，你可以在推特上试试应用程序并附加一个巨大的全景总部图像。该问题建议讨论限制录制视频的持续时间。

Answer 1

应用程序因图像过大而崩溃。您可以使用以下函数调整图像大小。此函数将返回图像。如果您需要数据，则取消注释这两行并返回数据而不是图像。

func compressImage(image:UIImage) -> UIImage {
    // Reducing file size to a 10th

    var actualHeight : CGFloat = image.size.height
    var actualWidth : CGFloat = image.size.width
    let maxHeight : CGFloat = 1136.0
    let maxWidth : CGFloat = 640.0
    var imgRatio : CGFloat = actualWidth/actualHeight
    let maxRatio : CGFloat = maxWidth/maxHeight

    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;
            compressionQuality = 1;
        }
    }


    let rect = CGRect.init(x: 0.0, y: 0.0, width: actualWidth, height: actualHeight)

    UIGraphicsBeginImageContext(rect.size);


    image.draw(in: rect)
    let img = UIGraphicsGetImageFromCurrentImageContext();

    //        let imageData = UIImageJPEGRepresentation(img ?? UIImage.init(named: "imgPlaceHolder")!, compressionQuality);
    //
    //        UIGraphicsEndImageContext();
    //
    return img ?? image
}

使用这个函数的代码

        picker.dismiss(animated: false, completion: {
            let img = self.compressImage(image: chosenImage)
            let cropViewController = TOCropViewController(image: img)
            cropViewController.delegate = self
            self.present(cropViewController, animated: false, completion: nil)

        })