UIScrollView doesn't deal well with subviews requiring touch tracking ...

Just filed bug #6635485:
If you embed a UITextField into a UITableViewCell you can't drag within the text field when it's the first responder (and the keyboard is up) and have the magnifier show up and drag with the touch. (I assume the same problem would happen if a UITextView were used ... but maybe not since it's derived from UIScrollView. I haven't tested that.)
The problem is that the UIScrollView which the UITableView is embedded within seems to be deciding that the touch drag events are scroll gestures and it grabs all of the touches. This also seems to actually screw up the UITextField's internal state (I'm guessing that they're not prepared to accept the "cancel touch events that the UIScrollView generates when it decides to take all the touches).
I've tried using the table view's canCancelContentTouches to NO and I've even tried subclassing UITableView and implementing a touchesShouldCancelInContentView: method which returns NO when the UITextField's are the object. None of this works. The only thing which does work is to disable scrolling by setting scrollEnabled to NO. Unfortunately this causes problem with longer tables where the keyboard slides over the fields one is trying to edit.
Apparently UIScrollView is supposed to have an exception from grabbing touches when the object where the touches began is derived from a UIControl but since UITextField is derived from UIControl this doesn't seem to be working properly. The problem may be caused by the fact that the UIView object which takes the touches (and manages the UITextField editing) is really something called a UIFieldEditor which is an undocumented class.
Since some UIControl-derived objects do work within UIScrollView's, I'm assuming that the issue with UITextField's is an oversight (possibly related to the aforementioned UIFieldEditor class which is taking the touches).
See also other reports of this problem:
http://forums.macrumors.com/showthread.php?t=521818
http://stackoverflow.com/questions/376372/editing-a-uitextfield-inside-a-uitable viewcell-fails

Check out this new thread about using UIScrollView: https://devforums.apple.com/message/85917 It was pretty helpful for me.
The reason you might have a no-op for touchesShouldCancelInContentView is because it has to be in your UIScrollView subclass, not in the child view. (I put it in the child view initially, and got no-ops also.) The ScrollView subclass gets that function called, and then it should probably call a function in your child view to actually tell what to do.

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UIScrollView doesn't deal well with subviews requiring touch tracking ...

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