完美解决 tableview上cell 倒计时。
后台模式依然执行倒计时,最低的 CPU 消耗.
在applicationDidEnterBackground方法中要允许在后台执行 GCD 定时器。
在定时器调用界面,记得及时取消定时器,否则会导致当前对象无法释放。
多cell倒计时
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