iOS开发 - Block块的使用（二）内存管理和特性

void foo()
{
__block int i = 1024;
__block int j = 1;
void (^blk)(void);
void (^blkInHeap)(void);
blk = ^{ printf("%d, %d\n", i, j);};//blk在栈里
j ++ ;
blkInHeap = Block_copy(blk);//blkInHeap在堆里   或者   blkInheap = [Block_copy copy];
blk(); // 此时打印的是 1024 ，2
 }

static int(^maxIntBlock)(int, int) = ^(int a, int b){return a>b?a:b;};
- (void)fooBar
{
int(^maxIntBlockCopied)(int, int) =[maxIntBlock copy];
}
void foo()
{
int(^maxIntBlockCopied)(int, int) = Block_copy(maxIntBlock);
}