我也遇到了这个问题，但是您的解决方案无法解决此问题. 这是我的代码:

I met this problem too, but I can't fix this issue by your solution.. Here is my code:

QLPreviewController *preview = [[QLPreviewController alloc] init];
[preview setDataSource:self];
[preview setDelegate:self];

if(SYSTEM_VERSION_LESS_THAN(@"10.0"))
{
    [self addChildViewController:preview];
}

[preview didMoveToParentViewController:self];
[self.view addSubview:preview.view];