CODEWITHSUNDEEP
iosobjective-c
FrozenHeart
FrozenHeart

Reputation: 20746

Scope in implementation block

I wonder is there any difference between the following code:

First

@implementation ViewController {
    AAShareBubbles *shareBubbles;
}

// methods' implementations

@end

Second

@implementation ViewController

AAShareBubbles *shareBubbles;

// methods' implementations

@end

Which one do you prefer and why?

Upvotes: 1

Views: 46

Answers (2)

QHa
QHa

Reputation: 36

First one: it's an instance variable.

Second one: it's a variable inside your implementation scope, you cannot use as an instance variable.

So they're different. P/S: I've never used the second one.

Upvotes: 2

larva
larva

Reputation: 5148

First code define Objective-C internal variable, so you can use inside of current implement.

Second define a private global variable in C style. If the same variable name is existed in two or more class this will case of runtime error like following image

enter image description here

Upvotes: 0

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