使用UIImageWriteToSavedPhotosAlbum保存图像，但是内存已满，如何捕获错误代码

问题描述

我正在使用以下代码:

UIImageWriteToSavedPhotosAlbum(_curView.image, self,@selector(image:didFinishSavingWithError:contextInfo:), nil);

将图像保存到相册.每当我的设备的内存已满时，我就会使用此选择器:

to save the images to the album. Whenever my device's memory is full, I am using this selector:

-(void)image:(UIImage *)image didFinishSavingWithError:(NSError *)error contextInfo:(void *)contextInfo

，但它不能识别错误，实际上，error为nil.发生错误时，我的设备内存已满.

but it didn't identify the error, in fact, error is nil.When the error occurs my device's memory is full.

如何检测内存是否可用?

How can I detect if the memory is available or not?

推荐答案

我遇到了同样的问题.看来您无法直接从UIImageView保存图像.您需要拍摄快照并保存它. Swift 3示例:

I got the same issue. It seems that you cannot save the image directly from your UIImageView. You need to take a snapshot and save it instead. Swift 3 example:

func takeSnapshot() -> UIImage? {
    UIGraphicsBeginImageContextWithOptions(imageView.bounds.size, false, UIScreen.main.scale);

    imageView.drawHierarchy(in: imageView.bounds, afterScreenUpdates: true)
    let image = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    return image;
}

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