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?

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.

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 ?

KCTKernAttributeName option not working in CTFrameGetLines I am trying to get a multiline of text from an NSMutableAttributedString via CTFrameGetLines. All other options are applied, but kCTKernAttributeName option is not reflected in CTFrameGetLines. Even if I put the value of kCTKernAttributeName in NSMutableAttributedString, it behaves as if there is no kCTKernAttributeName value. Is there any solution or cause?

I'm thinking of an app where only the watch app is the main function. However, since all functions are not available in the Watch app, we are thinking about handling some functions in the iPhone/iPad app. So, the Apple Watch standalone app seems impossible. In the iPhone/iPad, we are thinking of managing files and converting those files and transferring them to the Watch app. And the watch app plays the received file. (The main function is to play the file) The iPhone/iPad app does not play files. In the above case, I am wondering if our app can pass the Apple review.