call a method in a block?

问题

I'm new to ARC. I want to call a method in a complete block, but I get the warning: Capturing 'self' strongly in this block is likely to lead to a retain cycle.. Code:

- (void) handlerComplete
{
    //...
}

- (void) loadData
{
    ...
    operation.completeBlock = ^(NSInteger index) {
        [self handlerComplete];
    };
}

Any advice? Thanks.

回答1:

Try with

- (void) loadData
{
    __weak MyClassType *myClass = self;
    operation.completeBlock = ^(NSInteger index) {
        [myClass handlerComplete];
    };
}

回答2:

Make a weak reference instead:

operation.completeBlock = ^(NSInteger index) {
    __weak Foo *bar = self;
    [bar handlerComplete];
};

I think this will work, though I haven't verified it.

来源：https://stackoverflow.com/questions/9835476/call-a-method-in-a-block