倒计时

倒计时效果图

倒计时代码

- (void)viewDidLoad {

[super viewDidLoad];

[self createUI];

//    [NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:@selector(createTime:) userInfo:nil  repeats:YES];

NSTimer *timer = [NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:@selector(timerFire:) userInfo:nil repeats:YES];

}

- (void)createUI

{

_timeLab = [[UILabel alloc]initWithFrame:CGRectMake(kXFrom5(20), kYFrom5(160), kXFrom5(250), kYFrom5(50))];

_timeLab.backgroundColor = [UIColor blackColor];

[_timeLab setTextColor:[UIColor whiteColor]];

[self.view addSubview:_timeLab];

_todayLab = [[UILabel alloc]initWithFrame:CGRectMake(kXFrom5(10), kYFrom5(90), kXFrom5(300), kYFrom5(50))];

_todayLab.backgroundColor = [UIColor blackColor];

[_todayLab setTextColor:[UIColor whiteColor]];

[self.view addSubview:_todayLab];

_fireDateLab = [[UILabel alloc]initWithFrame:CGRectMake(kXFrom5(10), kYFrom5(30), kXFrom5(300), kYFrom5(50))];

_fireDateLab.backgroundColor = [UIColor blackColor];

[_fireDateLab setTextColor:[UIColor whiteColor]];

[self.view addSubview:_fireDateLab];

}

- (void)timerFire:(NSTimer *)timer

{

NSCalendar *calendar = [NSCalendar currentCalendar];

NSDateComponents *components = [[NSDateComponents alloc] init];

[components setYear:2016];

[components setMonth:7];

[components setDay:2];

[components setHour:9];

[components setMinute:0];

[components setSecond:0];

NSDate *fireDate = [calendar dateFromComponents:components];//目标时间

NSDate *today = [NSDate date];//当前时间

unsigned int unitFlags = NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit | NSHourCalendarUnit | NSMinuteCalendarUnit | NSSecondCalendarUnit;

NSDateComponents *d = [calendar components:unitFlags fromDate:today toDate:fireDate options:0];//计算时间差

_timeLab.text = [NSString stringWithFormat:@"倒计时 %d天%d小时%d%分%d秒", [d day], [d hour], [d minute], [d second]];//倒计时显示

_todayLab.text = [NSString stringWithFormat:@"现在 %@", today];//现在时间

_fireDateLab.text = [NSString stringWithFormat:@"设定时间 %@", fireDate];//设定过去时间

}