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;
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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);
}
}
}
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3.在需要出使用:
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[self downsecondhandle:@"1494622800000"];
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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