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  • Block variable in objective C

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    Block access the data in normal way as the other normal function do. Block can access any class variable or function variable out side it but cannot modified it.

    int x= 111;
    
    void (^printXAndY)(int) = ^(int y) {
        printf("%d %d\n", x, y);
    };
    printXAndY(333);
    

    output will be :

    111 333
    

    But if you try to assing the new value to variable x. then it will not change the value. For example

    int x= 111;
    void (^printXAndY)(int) = ^(int y) {
         x=x+y
        printf("%d %d\n", x, y);         //  error here
    };
    

    so if you want change the value then you can user __block before the variable. for example

    _block int x=111;
    

    then it upper block will the expected result. And it will add the both variable.

    111+333=444.
    

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