Tutorial :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?


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];  


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];  


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


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];  

Note:If u also have question or solution just comment us below or mail us on toontricks1994@gmail.com
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