示例代码简单易懂：
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#import
<uikit uikit.h="">
@interface
viewcontroller : uiviewcontroller
@property
(weak, nonatomic) iboutlet uilabel *daylabel;
@property
(weak, nonatomic) iboutlet uilabel *hourlabel;
@property
(weak, nonatomic) iboutlet uilabel *minutelabel;
@property
(weak, nonatomic) iboutlet uilabel *secondlabel;
@end</uikit>
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#import
"viewcontroller.h"
@interface
viewcontroller ()
{
dispatch_source_t
_timer;
}
@end
@implementation
viewcontroller
/**
*
获取当天的年月日的字符串
*
这里测试用
*
@return 格式为年-月-日
*/
-(nsstring
*)getyyyymmdd{
nsdate
*now = [nsdate date];
nsdateformatter
*formatday = [[nsdateformatter alloc] init];
formatday.dateformat
= @"yyyy-mm-dd";
nsstring
*daystr = [formatday stringfromdate:now];
return
daystr;
}
-
(void)viewdidload
{
[super
viewdidload];
nsdateformatter
*dateformatter=[[nsdateformatter alloc] init];
[dateformatter
setdateformat:@"yyyy-mm-dd"];
nsdate
*enddate = [dateformatter datefromstring:[self getyyyymmdd]];
nsdate
*enddate_tomorrow = [[nsdate alloc] initwithtimeintervalsincereferencedate:([enddate timeintervalsincereferencedate] +
24*3600)];
nsdate
*startdate = [nsdate date];
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);
}
}
}
<span
style="font-family:
arial, verdana, sans-serif;">效果：</span>
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以上所述是小编给大家介绍的ios中实现简单易懂秒杀倒计时／倒计时代码，希望对大家有所帮助，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对服务器之家网站的支持！
原文链接：http://blog.csdn.net/lea__dongyang/article/details/55016344