ios - CAAnimation 的 delegate 用 strong的原因是？

Question

IOS中，CAAnimation 这个类的 @property(nullable, strong) id delegate; 这个delegate用 strong的原因是？

Answer 1

Are you worried that the strong delegate will cause circular references? The situation here is different from the general delegate. First of all, the animation is asynchronous. During the animation process, its delegate may be released at any time. If it is not a strong reference, for example, the user clicks return. On the other hand, generally you don't hold a strong reference to a CAAnimation (unlike a UITableView). The documentation also says that this is an exception to the memory management rules.