IOS关于大型网站抢购、距活动结束，剩余时间倒计时的实现代码，代码比较简单，大家根据需求适当的添加修改删除代码

1.定义4个 Label 来接收倒计时:

@property (weak, nonatomic) IBOutlet UILabel *dayLabel;@property (weak, nonatomic) IBOutlet UILabel *hourLabel;@property (weak, nonatomic) IBOutlet UILabel *minuteLabel;@property (weak, nonatomic) IBOutlet UILabel *secondLabel;

2.在实现文件中实现方法:

//时间戳转换为日期格式(毫秒的时间戳)- (NSString *)timeWithTimeIntervalString:(NSString *)timeString{ // 格式化时间 NSDateFormatter* formatter = [[NSDateFormatter alloc] init]; formatter.timeZone = [NSTimeZone timeZoneWithName:@"shanghai"]; [formatter setDateStyle:NSDateFormatterMediumStyle]; [formatter setTimeStyle:NSDateFormatterShortStyle]; [formatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"]; // 毫秒值转化为秒 NSDate* date = [NSDate dateWithTimeIntervalSince1970:[timeString doubleValue]/ 1000.0]; NSString* dateString = [formatter stringFromDate:date]; NSLog(@"时间 === %@",dateString); return dateString;}-(void)downSecondHandle:(NSString *)aTimeString{ NSDateFormatter *dateFormatter=[[NSDateFormatter alloc] init]; [dateFormatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"]; NSDate *endDate = [dateFormatter dateFromString:[self timeWithTimeIntervalString:aTimeString]]; //结束时间 NSDate *endDate_tomorrow = [[NSDate alloc] initWithTimeIntervalSinceReferenceDate:([endDate timeIntervalSinceReferenceDate])]; NSDate *startDate = [NSDate date]; NSString* dateString = [dateFormatter stringFromDate:startDate]; NSLog(@"现在的时间 === %@",dateString); NSTimeInterval timeInterval =[endDate_tomorrow timeIntervalSinceDate:startDate]; if (_timer==nil) { __block int timeout = timeInterval; //倒计时时间 if (timeout!=0) { dispatch_queue_t queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0); _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，关闭 dispatch_source_cancel(_timer); _timer = nil; dispatch_async(dispatch_get_main_queue(), ^{ self.dayLabel.text = @""; self.hourLabel.text = @"00"; self.minuteLabel.text = @"00"; self.secondLabel.text = @"00"; }); }else{ int days = (int)(timeout/(3600*24)); if (days==0) { self.dayLabel.text = @""; } int hours = (int)((timeout-days*24*3600)/3600); int minute = (int)(timeout-days*24*3600-hours*3600)/60; int second = timeout-days*24*3600-hours*3600-minute*60; dispatch_async(dispatch_get_main_queue(), ^{ if (days==0) { self.dayLabel.text = @"0天"; }else{ self.dayLabel.text = [NSString stringWithFormat:@"%d天",days]; } if (hours<10) { self.hourLabel.text = [NSString stringWithFormat:@"0%d",hours]; }else{ self.hourLabel.text = [NSString stringWithFormat:@"%d",hours]; } if (minute<10) { self.minuteLabel.text = [NSString stringWithFormat:@"0%d",minute]; }else{ self.minuteLabel.text = [NSString stringWithFormat:@"%d",minute]; } if (second<10) { self.secondLabel.text = [NSString stringWithFormat:@"0%d",second]; }else{ self.secondLabel.text = [NSString stringWithFormat:@"%d",second]; } }); timeout--; } }); dispatch_resume(_timer); } }}

3.在需要出使用:

[self downSecondHandle:@"1494622800000"];

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