NSTimer 计时器的创建

最新推荐文章于 2021-07-24 22:21:30 发布

转载最新推荐文章于 2021-07-24 22:21:30 发布 · 391 阅读

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#NSTimer 倒计时计时器 iOS

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//定时器

m_pTimer =[NSTimer scheduledTimerWithTimeInterval:1.0

target:self

selector:@selector(calcuRemainTime)

userInfo:nil

repeats:YES];

//开始时间获取

m_pStartDate =[NSDate date];

// m_pStartDate= [[NSDate date] retain];

==============

#define TOTAL_TIME 3600

- (void)calcuRemainTime

{

double deltaTime =[[NSDate date] timeIntervalSinceDate:m_pStartDate];

// NSLog(@"%.f",deltaTime);

// NSLog(@"%d",(int)(deltaTime+0.5));

int remainTime= TOTAL_TIME -(int)(deltaTime+0.5) ;

if (remainTime< 0.0)

{

[m_pTimer invalidate];

//TODO:

//game over

return;

}

[self showTime:remainTime];

}

- (void)showTime:(int)time

{

int inputSeconds= (int)time;

int hours= inputSeconds/ 3600;

int minutes= ( inputSeconds - hours * 3600 )/ 60;

int seconds= inputSeconds - hours * 3600 -minutes * 60;

NSString *strTime= [NSString stringWithFormat:@"%.2d:%.2d:%.2d",hours,minutes,seconds];

//显示在文本视图中

NSLog(@"==%@",strTime);

}

第二种方式：

[NSTimerscheduledTimerWithTimeInterval:1.0 target:selfselector:@selector(timerFireMethod:) userInfo:nilrepeats:YES];//使用timer定时，每秒触发一次，然后就是写selector了。

-(void)timerFireMethod:(NSTimer*)theTimer{

//NSDateFormatter*dateformatter = [[[NSDateFormatter alloc]init]autorelease];//定义NSDateFormatter用来显示格式

//[dateformattersetDateFormat:@"yyyy MM dd hh mm ss"];//设定格式
NSCalendar *cal = [NSCalendarcurrentCalendar];//定义一个NSCalendar对象
NSDateComponents *shibo =[[NSDateComponents alloc] init];//初始化目标时间（好像是世博会的日期）
[shibo setYear:2010];
[shibo setMonth:5];
[shibo setDay:1];使用NSTimer实现倒计时
[shibo setHour:8];
[shibo setMinute:0];
[shibo setSecond:0];

NSDate *todate = [caldateFromComponents:shibo];//把目标时间装载入date
[shibo release];
// NSString *ssss = [dateformatter stringFromDate:dd];
// NSLog([NSString stringWithFormat:@"shiboshi:%@",ssss]);

NSDate *today = [NSDatedate];//得到当前时间
// NSString *sss = [dateformatter stringFromDate:today];
// NSLog([NSString stringWithFormat:@"xianzaishi:%@",sss]);
//用来得到具体的时差
unsigned int unitFlags =NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit |NSHourCalendarUnit | NSMinuteCalendarUnit |NSSecondCalendarUnit;
NSDateComponents *d = [calcomponents:unitFlags fromDate:today toDate:todateoptions:0];
lab.text = [NSStringstringWithFormat:@"%d年%d月%d日%d时%d分%d秒",[d year],[d month], [d day],[d hour], [d minute], [d second]];
}