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:
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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"]; |
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持服务器之家。
原文链接：https://blog.csdn.net/qq_19678579/article/details/71479968
