CODEWITHSUNDEEP
objective-cobjective-c-blocks
Enrico Susatyo
Enrico Susatyo

Reputation: 19790

Returning value to another variable outside a block

Suppose I have this kind function with a block inside it:

-(BOOL)checkSomething
{
    server = [[Server alloc] initWith:privateVar];

    [server checkSomethingWithCompletion:^(BOOL success){
        //I want to return the value of success
    }];

}

How do I go about returning the value that I get from the completion block? I'm not able to set variable from outside the block inside it. I'm also not able to return the value directly from the block.

Upvotes: 0

Views: 206

Answers (1)

Sulthan
Sulthan

Reputation: 130092

If your checkSomethingWithCompletion: method is running synchronously, declare a __block variable before the block. You can then write to the variable from your block.

If your method is running asynchronously, checkSomething will return sooner than checkSomethingWithCompletion and therefore you cannot return anything from this block. In this case, you should use some asynchronous way to get the data, e.g. using notification, delegate or a callback method. The completion block could also be a parameter to your checkSomething method.

Upvotes: 4

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