标签：
http://stackoverflow.com/questions/10663184/implementing-a-countdown-timer-in-objective-c
http://stackoverflow.com/questions/17145112/countdown-timer-ios-tutorial
iOS Countdown Timer To Specific Date
UITableViewCell countdown UILabel not updating
Multiple countdown timer in uitableviewcell not working
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原文地址：http://www.cnblogs.com/hl666/p/3870623.html
