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iOS实现秒杀活动倒计时

转载 作者:qq735679552 更新时间:2022-09-28 22:32:09 25 4
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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 。

iOS实现秒杀活动倒计时

1.定义4个 label 来接收倒计时

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@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

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//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

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[self downsecondhandle:@ "1494622800000" ];

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原文链接:https://blog.csdn.net/qq_19678579/article/details/71479968 。

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