NSTimer 有一个属性叫 fireDate ，意思就是开始时间。所以我们设置一个超远的时间就是暂停，设置当前时间就是开始。
创建
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_timer = [NSTimer scheduledTimerWithTimeInterval:1 target:self selector:@selector(testTimer) userInfo:nil repeats:YES];
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暂停
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[_timer setFireDate:[NSDate distantFuture]];
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继续
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[_timer setFireDate:[NSDate date]];
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停止
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