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iosobjective-ciphonecocoa-touchuikit

How can I add CGPoint objects to an NSArray the easy way?


I have about 50 CGPoint objects that describe something like a "path", and I want to add them to an NSArray. It's going to be a method that will just return the corresponding CGPoint for an given index. I don't want to create 50 variables like p1 = ...; p2 = ..., and so on. Is there an easy way that would let me to define those points "instantly" when initializing the NSArray with objects?


Solution

  • With UIKit Apple added support for CGPoint to NSValue, so you can do:

    NSArray *points = [NSArray arrayWithObjects:
                         [NSValue valueWithCGPoint:CGPointMake(5.5, 6.6)],
                         [NSValue valueWithCGPoint:CGPointMake(7.7, 8.8)],
                         nil];
    

    List as many [NSValue] instances as you have CGPoint, and end the list in nil. All objects in this structure are auto-released.

    On the flip side, when you're pulling the values out of the array:

    NSValue *val = [points objectAtIndex:0];
    CGPoint p = [val CGPointValue];