Transitioning to ARC Release[迁移到ARC机制来实现内存管理:官方文档]见链接：https://developer.apple.co
Transitioning to ARC Release[迁移到ARC机制来实现内存管理:官方文档]
见链接：
https://developer.apple.com/library/mac/#releasenotes/ObjectiveC/RN-TransitioningToARC/Introduction/Introduction.html#//apple_ref/doc/uid/TP40011226
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