This is the app we are currently selling. If you follow the steps below, you may experience a black screen phenomenon. Run the app and go to the home screen. Turn off the screen of the device and do not use it for a long time. Turn on the device's screen and launch the app from the home screen. Randomly, the entire app screen is black and nothing works. If you completely close the app and run it again, it will run normally. It has been reported to us since iOS 15. And in iOS 15 and iOS 14.8, a user sent us an email about the same phenomenon. This only happens on the iPad, not the iPhone. Supports iPad multitasking UIApplicationSupportsMultipleScenes is not supported. Can anyone advise us on the cause or solution of this symptom?

After the iOS 15 update, the following process causes the app to die. Go to the home screen while running the app Completely quit by removing the background state of the app Start by pressing the icon on the home screen As soon as the app is opened in the state it was in when the previous home screen was moved, there is a symptom that the app dies. There was no such symptom until iOS 14. Is this symptom a bug in iOS 15 ? Or is there a new option for background state of apps in iOS 15?

We are thinking about using NLTokenizer which is currently using CFStringTokenizer . What are the differences or advantages between the two APIs?

In the app, when users view AdMob rewarded video ads, banner ads are removed for a certain period of time and some additional features are provided. However, we had previously supported rewarded video ads without in-app purchases in the app, but were rejected by the app review. And after adding in-app purchases, it passed the review. Could it be that Apple's policy does not yet allow only rewarded video ads to be added to the app? Or is there any way ?

We are testing an app currently on sale on iOS 15. When I start scrolling up and down by touch in a UIPickerView , the scrolling is not smooth. There is a short break when you start scrolling. If I flick it quickly, it stops and after a while it has already scrolled to where some data has advanced. If we start scrolling and keep scrolling, then we don't have the above symptoms. The above symptoms start after the app does a big operation while loading a file. That is, when the symptom starts, it is there in the UIPickerView throughout the app. Only UIPickerView scrolling, other screen transitions or UITableView scrolling do not show such symptoms. There is no such symptom until iOS 14. Could you give us some advice on the cause of the above symptoms or how to improve it? The device tested is an iPhone 8 plus. We did send feedback to Apple through the Feedback app on devices that currently have iOS 15 installed.