Convert NSValue back to CGPoint

Question

I made an NSMutableArray like this storing a bunch of CGPoints

    safeZonePoints = [NSMutableArray array];
    [safeZonePoints addObject:[NSValue valueWithCGPoint:CGPointMake(234, 160)]];
    [safeZonePoints addObject:[NSValue valueWithCGPoint:CGPointMake(284, 210)]];
    [safeZonePoints addObject:[NSValue valueWithCGPoint:CGPointMake(334, 160)]];
    [safeZonePoints addObject:[NSValue valueWithCGPoint:CGPointMake(284, 10)]];
    [safeZonePoints addObject:[NSValue valueWithCGPoint:CGPointMake(234, 160)]];

Now I can get the NSValues from the array, but how do I convert an NSValue back to CGPoint?

There are docs. If you lookup `valueWithCGPoint` the description provides the inverse operation with "See Also `– CGPointValue:`". — zaph, Jul 30 '14 at 21:34

score 2 · Accepted Answer · edited May 23 '17 at 12:32

2

Do something like this:

NSValue *cgpointObj = [NSValue valueWithCGPoint:CGPointMake(234, 160)];
CGPoint loc = cgpointObj.pointValue;

Check out the following link: CGPoint to NSValue and reverse

It should be enough to answer your question.

edited May 23 '17 at 12:32

Community

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answered Jul 30 '14 at 21:32

Wyetro

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I have one more question, is it computationally better to use CGPoint[] over NSMutableArray, and if it is how much better is it. – the pickle Aug 01 '14 at 01:30
Not sure, google it or ask a new question. – Wyetro Aug 01 '14 at 04:38
This doesn't work in XCode 10. – Jubei Aug 13 '19 at 22:02
@Jubei this is from over 5 years ago – Wyetro Aug 14 '19 at 04:28
@Wyetro I’m just adding knowledge to this post. Is this a reason for you to downvote me? I have improved the post in case somebody stumbles upon this today (like I did). – Jubei Aug 24 '19 at 11:48
@Jubei you can't downvote comments... My point was only that this is from a long time ago. Additionally, the link I have there has the solution: `CGPoint location = locationValue.CGPointValue` – Wyetro Aug 24 '19 at 19:37

Convert NSValue back to CGPoint

1 Answers1