How to set pointer to CGColor object nil / NULL?

Question

I have the following property:

@property (nonatomic) CGColorRef *strokeColor;

At a certain point in my program, I set it to nil. Then later on in my program I check to see if it's nil:

CGColorRef strokeColor = (*graphicPath.strokeColor != nil) ? CGColorRetain(*graphicPath.strokeColor)  : nil;

I'm getting a bad access at this line. I've also tried using NULL and still no dice. It works when there is something stored in it and it's not nil / NULL.

How can I get this to work?

Answer 1

卸下*您则strokeColor的定义（这已经是一个指针，因为它是一个CGColorRef ），并从graphicPath，它可能会解决您的问题。

Answer 2

Check my comment above:

Whether I don't understand what you're trying to do or your syntax is definitely wrong. Why are you using indirection (*) in the comparison? Remember CGColorRef is already a reference, you don't need to use it as a pointer!

And accept this an answer if helped you.

Answer 3

Had to change

(*graphicPath.strokeColor != nil)

to

(graphicPath.strokeColor != nil)

(got rid of the asterisk).