CODEWITHSUNDEEP
iphoneuiscrollview
Jools
Jools

Reputation: 133

Determine if a subview is visible in a UIScrollView

I've added a view to my app, that contains a UIScrollView, with a number of UITextViews in it's content view. This works perfectly on OS 3.0 and up, but when I test it on my 2.2.1 iPod touch, there is a UITextView bug that stops any text views automatically updating their content when they are scrolled into view - so you have to send them the setNeedsDisplay message.

However, I only want to do this when they start to become visible during the scroll - how do I determine, in the UIScrollView's scrollViewDidScroll delegate method, whether a UITextView is visible in the UIScrollView's frame?

Ta. Jools.

Upvotes: 12

Views: 20287

Answers (1)

Ole Begemann
Ole Begemann

Reputation: 135588

You have to do the calculation manually whenever the scroll view scrolls. This answer might help.

Upvotes: 16

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