时间戳

时间戳

ios 在webView中的网页中，时间戳使用时（js）格式要用/ 而不能是-
如 应该使用2018/09/07，而不是2018-07-09

时间戳的使用和获取

1. 根据时间string获取时间戳

//根据时间string获取时间戳
NSString *startTime = [_sessionArray[indexPath.row] objectForKey:@"talktime"];
NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
[formatter setDateFormat:@"YYYY-MM-dd HH:mm"];
NSDate *startDate = [formatter dateFromString:startTime];
NSUInteger startStamp = [startDate timeIntervalSince1970];

2. 获取当前时间戳

//获取当前时间戳
NSDate *nowDate = [NSDate date];
NSUInteger nowStamp = [nowDate timeIntervalSince1970];

3. 根据时间获取倒计时并显示

if (nowStamp < startStamp) {
    [self startTimerWithSeconds:startStamp - nowStamp endBlock:^{
        //time 倒计时显示时间
        NSString *time = [self timeBeforeInfoWithString:startStamp];
     }];
}
// 根据时间戳进行倒计时
- (void)startTimerWithSeconds:(long)seconds endBlock:(void(^)(void))endBlock
{
    __block long timeout = seconds;//倒计时时间
    dispatch_queue_t queue =dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT,0);
    dispatch_source_t _timer =dispatch_source_create(DISPATCH_SOURCE_TYPE_TIMER,0,0,queue);
    dispatch_source_set_timer(_timer,dispatch_walltime(NULL,0),1.0*NSEC_PER_SEC,0);//每秒执行
    dispatch_source_set_event_handler(_timer, ^{
        if(timeout < 0){ //倒计时结束，回调block
            dispatch_source_cancel(_timer);
            dispatch_async(dispatch_get_main_queue(), ^{
                // 主线程处理

            });
        }else{
            timeout -= 1;
            dispatch_async(dispatch_get_main_queue(), ^{
                if(endBlock) {
                    endBlock();
                }
            });
        }
    });
    dispatch_resume(_timer);
}

//倒计时显示格式 （剩余时间）
- (NSString *)timeBeforeInfoWithString:(NSTimeInterval)timeIntrval{
    
    NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
    [dateFormatter setDateFormat:@"YYYY-MM-dd HH:mm:ss"];
    //获取此时时间戳长度
    NSTimeInterval nowTimeinterval = [[NSDate date] timeIntervalSince1970];
    int timeInt = timeIntrval - nowTimeinterval; //时间差
    
    int year = timeInt / (3600 * 24 * 30 *12);
    int month = timeInt / (3600 * 24 * 30);
    int day = timeInt / (3600 * 24);
    int hour = timeInt % (3600 * 24) / 3600;
    int minute = timeInt % (3600 * 24) % 3600 / 60;
    int second = timeInt % (3600 * 24) % 3600 % 60;
    if (year > 0) {
        return [NSString stringWithFormat:@"%d年后",year];
    }else if(month > 0){
        return [NSString stringWithFormat:@"%d个月后",month];
    }else if(day > 0){
        return [NSString stringWithFormat:@"%d天%02d:%02d:%02d", day, hour, minute, second];
    }else if(hour > 0){
        return [NSString stringWithFormat:@"%02d:%02d:%02d", hour, minute, second];
    }else if(minute > 0){
        return [NSString stringWithFormat:@"%02d:%02d",minute, second];
    }else{
        return [NSString stringWithFormat:@"%02d", second];
    }
}