这个复制代码有泄漏吗？

Question

这段代码有泄漏吗？

// Move the group
 Group *movedGroup = [[Group alloc] init];
 movedGroup = [[[[GroupList sharedGroupList] groups] objectAtIndex:fromIndex] copy];
 [[GroupList sharedGroupList] deleteGroup:fromIndex];
 [[GroupList sharedGroupList] insertGroup:movedGroup atIndex:toIndex];

 // Update the loadedGroupIndex pointer
 if (loadedGroupIndex < fromIndex & loadedGroupIndex >= toIndex) {
  loadedGroupIndex = loadedGroupIndex + 1;
 } else if (loadedGroupIndex > fromIndex & loadedGroupIndex < toIndex) {
  loadedGroupIndex = loadedGroupIndex - 1;
 } else if (loadedGroupIndex == fromIndex) {
  loadedGroupIndex = toIndex;
 }
 [movedGroup release]

Answer 1

第一个实例化的 Group 将泄漏。您丢失了对它的引用（分配movedGroup = ...）并且它没有标记为自动释放。您可以将前两行简化为：

Group *movedGroup = [[[[GroupList sharedGroupList] groups] objectAtIndex:fromIndex] copy];

它会做同样的事情，没有泄漏。