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POiOS: Understanding positionFromPosition:inDirection:offset:
 

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  1. POiOS: Understanding positionFromPosition:inDirection:offset:
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    <p>I'm trying to implement my own UITextInput however I'm having trouble updating the position using the cursor key on a Bluetooth keyboard. I'm trying to create a TextInput that loops, if you imagine the characters being numbered like this:</p> <pre><code>1 2 3 4 5 6 7 8 9 </code></pre> <p>Then pressing up at position 2, should take you to position 8 (pressing left on 6 takes you to 4 etc). iOS seems to call positionFromPosition:inDirection:offset: to figure how where to move from the current position. It then calls setSelectedTextRange: to update the cursor position.</p> <p>This is fine so far, but it seem that sometimes iOS DOESN'T call positionFromPosition:inDirection:offset: for example if I press Up and then Down again, iOS appears to cache the previous position and just call setSelectedTextRange: with that previous value. I don't understand this, is there a way of telling iOS that the selected position has changed and it should clear it's cache, i.e. if someone presses a "clear" button or something?</p> <p>The caching ONLY seems to occur for Up and Down cursor key presses, moving left and right never caches previous values and positionFromPosition:inDirection:offset: is always called. Even if I don't consider the possibility of something reseting the cursor position I still have issues with "positionFromPosition:inDirection:offset:" not being called occasionally, and I just keep getting "setSelectedTextRange:" set to the same value by iOS. So if feels like there's something I've misunderstood about how iOS is caching cursor movement. Can anyone help me out?</p>
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    1. COI guess that I don't understand the problem here. If you press up, and then down (quickly enough to where it caches it), shouldn't you end up back at the same location? They would "cancel each other out" in this case....
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    2. CO@lnafziger what if something else changed the cursor position in the mean time? Like a clear button or similar? How would I tell iOS about this?
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    3. CO@lnafziger I'm also finding it sometimes just jams up and the same position keeps being sent to setSelectedTextRange: which makes me think there's something I'm missing.
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