How to initialize a NSMutable array in a UIView subclass

Question

I create an NSMutableArray and fill it with a bunch coordinates.

I assign the array to the property of another array like this:

draw.shapeCoords = [shapes shapeCoords];

Where draw is a class and shapes is a class and shapeCoords are properties in both of them.

When I get to my drawRect method, the array of coordinates is empty. I'm did a little research and found that the @synthesize does not fully instantiate an NSMutableArray, how then in my draw class (which implements UIView) do I initialize the array? Basically, I need access to the data in the array, how do I get it?

Chuck · Accepted Answer · 2013-04-17 23:25:09Z

2

@synthesize doesn't instantiate an object at all — it just creates a variable (initialized to nil) and accessor methods. You need to actually create the array. In your initWithFrame:, you'll want something like _shapeCoords = [[NSMutableArray alloc] init].

answered Apr 17, 2013 at 23:25

Chuck

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6 Comments

tentmaking Over a year ago

When is initiWithFrame called? I don't think it is being called and I am not calling it. How do I get initWithFrame to execute? Thanks.

tentmaking Over a year ago

That didn't work, I was sure it would though. Can you think of any reason why the array would be empty every time I try to grab it?

j_lentini Over a year ago

Just wondering, shouldn't it be self.shapeCoords since _shapeCoords is an accessor, not a setter?

Chuck Over a year ago

@ChrisLoonam: Either I don't understand what you're saying or you have that backwards.

j_lentini Over a year ago

Maybe I'm wrong, I just thought that using self. is how you're supposed to set properties

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