objective-c - 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?

Answer 1

@synthesize根本不实例化一个对象——它只是创建一个变量（初始化为 nil）和访问器方法。您需要实际创建数组。在你的initWithFrame:，你会想要类似的东西_shapeCoords = [[NSMutableArray alloc] init]。