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



Question:

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:1

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];  


Solution:2

I use this:

Create array:

NSArray *myArray = @[[NSValue valueWithCGPoint:CGPointMake(30.0, 150.0)],[NSValue valueWithCGPoint:CGPointMake(41.67, 145.19)]];  

Get 1st CGPoint object:

CGPoint myPoint = [myArray[0] CGPointValue];  


Solution:3

Have you taken a look at CFMutableArray? That might work better for you.


Solution:4

You can also write this in a standard C/C++ way:

CGPoint oldschool[] = { CGPointMake(5.5, 6.6),                          CGPointMake(7.7, 8.8) };    CGPoint p2 = oldschool[1];  

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