UIRefreshControl_iOS_16_17

Testing UIRefreshControl on iOS16 and iOS 17

iOS 16

• Works fine on iOS 16

UIRefreshControl error on iOS 17

• A UIRefreshControl received offscreen beginRefreshing. Ignored. Break on UIRefreshControlReceivedOffscreenBeginRefreshing to debug. <UIRefreshControl: 0x1042081c0; frame = (0 0; 0 60); hidden = YES; autoresize = W; layer = <CALayer: 0x60000022f580>>

Reason for failure on iOS 17

• UIRefreshControl ignores calls to begin refreshing if it's not on screen
• viewDidLoad(), viewWillAppear(); these methods anwsers to life cycles that are not on screen yet

Solution 1

• viewDidAppear(_) method is called when views are on Screen already, so this will fixed the "UIRefreshControlReceivedOffscreenBeginRefreshing error"
• but the UIRefreshControl will not still start to refrest on iOS 17

Solution 1 (Note)

• the refreshing actually works with Solution 1's viewDidAppear(_), because if a gentle pull down is applied on the screen the refresh control is revealed.
• Summarily, it appears that viewDidAppear(_) is too late to handle this with respect to view life cycles
• Also viewDidLoad(), viewWillAppear() are to early.

Solution 2

• In iOS 17, Apple introduced a new life cycle in iOS 17, viewIsAppearing(_)
• having the refresh method in the life cycle hierarchy fixes the issue

Solution 2 (Note)

• viewIsAppearing(_) is backwards compartible all the way down to iOS 13.
• to use this method, you need to be running on XCode 15 and above

Linkd

• Apple Documentation link
• ohmyswift's usage link
• Essential Developer youtube link
• Liamnichols's environment compatibiity link