EXC_BAD_ACCESS when copying or retaining Block
exc-bad-access, iphone, objective-c, objective-c-blocks
Solution
After a long and boring afternoon and evening I finally came across this answer here, although it may seem unrelated, the chain of websites I visited to find it, creates that relation.
Basically I had to remove `-weak_library /usr/lib/libSystem.B.dylib` from the linker flags and replace it with `-weak-lSystem`.
Problem
As far as I understand a Block acts like an object, in that you can send copy or release messages to it, e.g: ``` [myBlock copy]; ``` However whenever I do this, or release a block, I get EXC_BAD_ACCESS. If I use the block functions, everything works as expected, e.g.: ``` Block_copy(myBlock); ``` I thought both ways of releasing and copying blocks were identical? It's not that much of a problem, but it is a little annoying that if I have a property (copy) which is a Block, I have to write the setter method myself. For example: With Properties: ``` //Header @property (nonatomic, copy) void (^cancelledBlock)(void); //Implementation @sythesize cancelledBlock; ``` leads to EXC_BAD_ACCESS when setting `cancelledBlock` but if I do: ``` //Header @property (nonatomic, copy) void (^cancelledBlock)(void); //Implementation @sythesize cancelledBlock; //saves me doing the getter as well - (void)setCancelledBlock:(void (^)(void))aCancelledBlock { if (cancelledBlock == aCancelledBlock) { return; } void (^oldValue)(void) = cancelledBlock; cancelledBlock = Block_copy(aCancelledBlock); Block_release(oldValue); } ``` there is no EXC_BAD_ACCESS and everything runs as it should.