Static block variable in Objective-C

Question

Is it possible to have a static variable of a "block type"?

I have a class that only does stuff in static methods. Upon execution of those methods i'm calling statusChangedBlock. Just for that i create a shared instance of the class, and use its single block property. I wonder if it's possible to have a static block variable; so i wouldn't have to create a instance with a single property, just for notifying that my status changed.

I know there is an option of NSNotification, but i don't like using it, with some rare exceptions.

...this question somehow sounds stupid, i can't tell why. I hope someone points that out.

you can declare it static, but not create it static. it is what function for — Bryan Chen, Nov 22 '13 at 00:24
@BryanChen i can't figure out how to declare it static; also not sure what do you mean by "function for". Can you give a simple example? — user1244109, Nov 22 '13 at 00:27

score 11 · Accepted Answer · answered Nov 22 '13 at 00:29

11

to declare a static variable of block type

typedef ReturnType (^MyBlockType)(ArgumentType, ArgumentType2);
static MyBlockType myblock;
static MyBlockType myblock2;

or

static ReturnType (^myblock)(ArgumentType, ArgumentType2);

answered Nov 22 '13 at 00:29

Bryan Chen

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`static MyBlockType myAssignedBlock = ^ReturnType(ArgumentType arg1,ArgumentType2 arg2){...do something...};` works fine. – Wil Macaulay Jul 27 '14 at 18:07

score 0 · Answer 2 · edited Feb 03 '20 at 14:51

0

A block type variable is actually a pointer, similar to an object. You can have a static block variable, but you must assign its value at runtime, perhaps using a dispatch_once block.

edited Feb 03 '20 at 14:51

Iulian Onofrei

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answered Nov 22 '13 at 00:27

Holly

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Thanks! it would realy help if you provided some simplest example – user1244109 Nov 22 '13 at 00:29

Static block variable in Objective-C

2 Answers2