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1，暂停：
pauseStart = [[NSDate dateWithTimeIntervalSinceNow:0] retain];
previousFireDate = [[timer fireDate] retain];
[timer setFireDate:[NSDate distantFuture]];
2，恢复：
float pauseTime = -1*[pauseStart timeIntervalSinceNow];
[timer setFireDate:[NSDate dateWithTimeInterval:pauseTime sinceDate:previousFireDate]];
just so easy!!
其中 要先声明：两个date对象：
pauseStart, previousFireDate. 还有一个timer对象。NSTimer *timer; | 
转播
