iOS开发之--实现倒计时显示时分秒

这段时间写公司的一个外包项目，需要用到倒计时：需要显示时分秒，通过在网上搜集资料，找到了2中方法，我把这两种方法结合起来，可以很好的满足这个需求：

1、创建一个类继承自UIlabel，用来展示时分秒的

.h文件

#import <UIKit/UIKit.h>

@interface TimerLab : UILabel

@property (nonatomic,assign)NSInteger second;

@property (nonatomic,assign)NSInteger minute;

@property (nonatomic,assign)NSInteger hour;

@end

.m文件

#import "TimerLab.h"

@interface TimerLab ()

@property (nonatomic, strong)NSTimer *timer;

@end

@implementation TimerLab

- (id)initWithFrame:(CGRect)frame{

    self = [super initWithFrame:frame];

    if (self) {

        self.textAlignment = NSTextAlignmentCenter;

        self.timer = [NSTimer scheduledTimerWithTimeInterval: target:self selector:@selector(timeHeadle) userInfo:nil repeats:YES];

    }

    return self;

}

- (void)timeHeadle{

    self.second--;

    if (self.second==-) {

        self.second=;

        self.minute--;

        if (self.minute==-) {

            self.minute=;

            self.hour--;

        }

    }

    if (self.hour <   || self.minute <  || self.second < ) {

        self.text = @"倒计时结束需要显示的字样";

        [self.timer invalidate];

        self.timer = nil;

    }else

    {

        self.text = [NSString stringWithFormat:@"%ld:%ld:%ld",(long)self.hour,(long)self.minute,(long)self.second];

    }

    if (self.second== && self.minute== && self.hour==) {

        [self.timer invalidate];

        self.timer = nil;

    }

}

@end

2、我是在cell里面显示的，（这里注意，不能用xib或者SB拖得，那样不行，必须得是手写，具体是因为使用拖得空间，没有走alloc很重，所以在控制器上显示会有问题）

（1）在项目里面具体实现下面这2个方法

#pragma mark 每个cell倒计时的方法/*-------------------------------------------------------*/

- (NSString*)remainingTimeMethodAction:(long long)endTime

{

    //得到当前时间

    NSDate *nowData = [NSDate date];

    NSLog(@"---当前时间：%@",nowData);

    NSDate *endData=[NSDate dateWithTimeIntervalSince1970:endTime];

    NSLog(@"----结束时间%@",endData);

    NSCalendar* chineseClendar = [ [ NSCalendar alloc ] initWithCalendarIdentifier:NSGregorianCalendar ];

    NSUInteger unitFlags =

    NSHourCalendarUnit | NSMinuteCalendarUnit | NSSecondCalendarUnit | NSDayCalendarUnit | NSMonthCalendarUnit | NSYearCalendarUnit;

    NSDateComponents *cps = [chineseClendar components:unitFlags fromDate:nowData toDate: endData options:];

    NSInteger Hour = [cps hour];

    NSInteger Min = [cps minute];

    NSInteger Sec = [cps second];

    NSInteger Day = [cps day];

    NSInteger Mon = [cps month];

    NSInteger Year = [cps year];

    NSLog( @" From Now to %@, diff: Years: %ld Months: %ld, Days; %ld, Hours: %ld, Mins:%ld, sec:.%ld",

          [nowData description], (long)Year, (long)Mon, (long)Day, (long)Hour, (long)Min,(long)Sec );

    //    NSString *countdown = [NSString stringWithFormat:@"还剩: %zi天 %zi小时 %zi分钟 %zi秒 ", Day,Hour, Min, Sec];

    NSString *countdown = [NSString stringWithFormat:@"%zi:%zi:%zi",Hour, Min, Sec];

    NSLog(@"0000%@",countdown);

    if (Sec< && Min< && Hour<) {

        countdown=[NSString stringWithFormat:@"进行中"];

    }

    return countdown;

}

//时间转化时间戳

-(NSString *)checksting:(NSString *)datas

{

    NSDateFormatter *formatter = [[NSDateFormatter alloc] init];

    [formatter setDateStyle:NSDateFormatterMediumStyle];

    [formatter setTimeStyle:NSDateFormatterShortStyle];

    [formatter setDateFormat:@"YYYY-MM-dd HH:mm:ss"];

    NSDate *date = [formatter dateFromString:datas];

    NSString *timerStrs = [NSString stringWithFormat:@"%ld", (long)[date timeIntervalSince1970]];

    return timerStrs;

}

#pragma mark/*------------------------------------------------------------------------- */

3，cell里面的具体赋值操作

 //1、 获得到期时间串

        NSString *timSts = [NSString stringWithFormat:@"%@",model.time2];

        //2、 转化成到时时间戳，并传进对比方法里面

        NSString *timerStrs = [NSString stringWithFormat:@"%@",[self remainingTimeMethodAction:[[self checksting:timSts] longLongValue]]];

        //3、 分割字符串，取出时分秒

        NSArray *ary = [timerStrs componentsSeparatedByString:@":"];

        NSLog(@"ary is %@",timerStrs);

        if (ary.count == ) {

            cell.YB_dqTimeLab.hour = [[ary objectAtIndex:] integerValue];

            cell.YB_dqTimeLab.minute = [[ary objectAtIndex:] integerValue];

            cell.YB_dqTimeLab.second = [[ary objectAtIndex:] integerValue];

        }else if(ary.count == )

        {

            cell.YB_dqTimeLab.hour = ;

            cell.YB_dqTimeLab.minute = ;

            cell.YB_dqTimeLab.second = ;

        }

我是用了别人写好的倒计时显示用的自定义的label，然后使用时间比对的方法，算出时间差，然后进行倒计时的操作！如有理解不到的地方

还希望大家指正！

巴特西

iOS开发之--实现倒计时显示时分秒

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