For iPad / iPhone apps, how to have an array of points?

Question

We can have an NSMutableArray object, and add objects to it.

But CGPoint is not an object... are there Point objects suitable to be added to an NSMutableArray object?

I see some code using NSStringFromCGPoint to create an NSString object so that it can be added to the array, and later use CGPointFromString to get the CGPoint back... but that just looks too much of a hack...

score 10 · Accepted Answer · answered Apr 21 '12 at 19:35

10

You can store the points in the array using NSValue as a wrapper:

CGPoint a = CGPointMake(10.0, 10.0);
[array addObject:[NSValue valueWithCGPoint:a]];

CGPoint b = [(NSValue *)[array objectAtIndex:0] CGPointValue];

answered Apr 21 '12 at 19:35

sch

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thanks for the solutions for going back and forth between NSValue and CGPoint – Jeremy L Apr 22 '12 at 05:16

score 6 · Answer 2 · answered Apr 21 '12 at 19:33

6

You should use the NSValue class with the following methods:

+ valueWithCGPoint:
- CGPointValue

answered Apr 21 '12 at 19:33

Hampus Nilsson

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score 3 · Answer 3 · edited May 23 '17 at 11:50

3

You have to choose between...

A. c pointer array (look here)

or

B. NSValue or your NSStringFromCGPoint. Like this: [NSValue valueWithCGPoint:CGPointMake(5.5, 6.6)]

edited May 23 '17 at 11:50

Community

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answered Apr 21 '12 at 19:34

Jonas Schnelli

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For iPad / iPhone apps, how to have an array of points?

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