1.首先controller只负责创建一个NSTimer，并且放入Runloop里。
self.m_timer = [NSTimer timerWithTimeInterval:1.0 target:self selector:@selector(timerEvent) userInfo:nil repeats:YES];
[[NSRunLoop currentRunLoop] addTimer:_m_timer forMode:NSRunLoopCommonModes];
响应事件timerEvent里需要每隔一秒发送一个通知给cell
- (void)timerEvent
{
for(intcount =0; count
{
TimeModel *model =self.m_dataArray[count];
[model countDown];
}
[[NSNotificationCenter defaultCenter] postNotificationName:NOTIFICATION_TIME_CELL object:nil];
}
2.创建时间Model负责对时间进行减1操作，并且把剩余时间转化成想要的格式赋值给cell。
.h
@property (nonatomic,assign)int countNum
+ (instancetype)timeModelWithTime:(int)time;
- (void)countDown;
- (NSString*)currentTimeString;
.m
+ (instancetype)timeModelWithTime:(int)time
{
TimeModel*model = [self new];
model.countNum= time;
return model;
}
- (void)countDown
{
_countNum -= 1;
}
- (NSString*)currentTimeString
{
if (_countNum <= 0)
{
return@"活动结束";
}
else
{
return [NSString stringWithFormat:@"%02ld:%02ld:%02ld",(long)_countNum/3600,(long)_countNum%3600/60,(long)_countNum%60];
}
}
