UIImagePickerController ImageIO_PNG占用大量内存

Question

虽然我在UIImagePickerController完成拍照后调整了图像大小，但我的乐器配置文件显示，每次拍照时，对ImageIO_PNG的调用都会占用大量内存（40 MB +）。这是我的代码：

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info  {
    @autoreleasepool {
        if (myImageView.image == nil) {

            myImageView.contentMode = UIViewContentModeScaleAspectFill;

            UIImage *topImage = [info objectForKey:@"UIImagePickerControllerOriginalImage"];

            UIImage *image = [info objectForKey:UIImagePickerControllerOriginalImage];
            CGRect rect = CGRectMake(0,0,320,440);

            UIGraphicsBeginImageContext( rect.size );
            // use the local image variable to draw in context
            [topImage drawInRect:rect];
            UIImage *topResized = UIGraphicsGetImageFromCurrentImageContext();
            UIGraphicsEndImageContext();

            myImageView.image = topResized;
            image = nil;
            info = nil;

            [picker dismissViewControllerAnimated:NO completion:nil];
            [picker removeFromParentViewController];

Answer 1

从您的代码中移除可能有用的下一行：

image = nil;
info = nil;