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  • Block variable in objective C

    @jitendra.bhumiwal
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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.

    1. int x= 111;
    2.  
    3. void (^printXAndY)(int) = ^(int y) {
    4.     printf("%d %d\n", x, y);
    5. };
    6. printXAndY(333);

    output will be :

    1. 111 333

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

    1. int x= 111;
    2. void (^printXAndY)(int) = ^(int y) {
    3.      x=x+y
    4.     printf("%d %d\n", x, y);         //  error here
    5. };

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

    1. _block int x=111;

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

    1. 111+333=444.
    __block in objective C __block storage __block variable
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