iOS 在多个cell上进行单独倒计时的处理方法

具体效果如下


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在一个第三方库的基础上进行的修改完善。每次写博客之前，都感觉犹如连绵江水滔滔不绝，一开始写，就各种卡壳，还是直接上代码吧。
三方库.h

#import <Foundation/Foundation.h>
#import <UIKit/UIKit.h>

@interface CountDown : NSObject
///用NSDate日期倒计时
-(void)countDownWithStratDate:(NSDate *)startDate finishDate:(NSDate *)finishDate completeBlock:(void (^)(NSInteger day,NSInteger hour,NSInteger minute,NSInteger second))completeBlock;
///用时间戳倒计时
-(void)countDownWithStratTimeStamp:(long long)starTimeStamp finishTimeStamp:(long long)finishTimeStamp completeBlock:(void (^)(NSInteger day,NSInteger hour,NSInteger minute,NSInteger second))completeBlock;
///每秒走一次，回调block
-(void)countDownWithPER_SECBlock:(void (^)())PER_SECBlock;
-(void)destoryTimer;
-(NSDate *)dateWithLongLong:(long long)longlongValue;
@end

.m

#import "CountDown.h"

@interface CountDown ()
@property(nonatomic,retain) dispatch_source_t timer;
@property(nonatomic,retain) NSDateFormatter *dateFormatter;

@end

@implementation CountDown
- (instancetype)init{
    self = [super init];
    if (self) {
        self.dateFormatter=[[NSDateFormatter alloc] init];
        [self.dateFormatter setDateFormat:@"YYYY-MM-dd HH:mm:ss"];
          NSTimeZone *localTimeZone = [NSTimeZone localTimeZone];
         [self.dateFormatter setTimeZone:localTimeZone];
    }
    return self;
}

-(void)countDownWithStratDate:(NSDate *)startDate finishDate:(NSDate *)finishDate completeBlock:(void (^)(NSInteger day,NSInteger hour,NSInteger minute,NSInteger second))completeBlock{
    if (_timer==nil) {
        NSTimeInterval timeInterval =[finishDate timeIntervalSinceDate:startDate];
        __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(), ^{
                        completeBlock(0,0,0,0);
                    });
                }else{
                    int days = (int)(timeout/(3600*24));
                    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(), ^{
                        completeBlock(days,hours,minute,second);
                    });
                    timeout--;
                }
            });
            dispatch_resume(_timer);
        }
    }
}
-(void)countDownWithPER_SECBlock:(void (^)())PER_SECBlock{
    if (_timer==nil) {
            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, ^{
                dispatch_async(dispatch_get_main_queue(), ^{
                    PER_SECBlock();
                });
            });
            dispatch_resume(_timer);
    }
}
-(NSDate *)dateWithLongLong:(long long)longlongValue{
    long long value = longlongValue/1000;
    NSNumber *time = [NSNumber numberWithLongLong:value];
    //转换成NSTimeInterval,用longLongValue，防止溢出
    NSTimeInterval nsTimeInterval = [time longLongValue];
    NSDate *date = [[NSDate alloc] initWithTimeIntervalSince1970:nsTimeInterval];
    return date;
}
-(void)countDownWithStratTimeStamp:(long long)starTimeStamp finishTimeStamp:(long long)finishTimeStamp completeBlock:(void (^)(NSInteger day,NSInteger hour,NSInteger minute,NSInteger second))completeBlock{
    if (_timer==nil) {
        NSDate *finishDate = [self dateWithLongLong:finishTimeStamp];
        NSDate *startDate  = [self dateWithLongLong:starTimeStamp];
        NSTimeInterval timeInterval =[finishDate timeIntervalSinceDate:startDate];
        __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(), ^{
                        completeBlock(0,0,0,0);
                    });
                }else{
                    int days = (int)(timeout/(3600*24));
                    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(), ^{
                        completeBlock(days,hours,minute,second);
                    });
                    timeout--;
                }
            });
            dispatch_resume(_timer);
        }
    }
}
/**
 *  获取当天的年月日的字符串
 *  @return 格式为年-月-日
 */
-(NSString *)getNowyyyymmdd{
    NSDate *now = [NSDate date];
    NSDateFormatter *formatDay = [[NSDateFormatter alloc] init];
    formatDay.dateFormat = @"yyyy-MM-dd";
    NSString *dayStr = [formatDay stringFromDate:now];
    return dayStr;
}
/**
 *  主动销毁定时器
 *  @return 格式为年-月-日
 */
-(void)destoryTimer{
    if (_timer) {
        dispatch_source_cancel(_timer);
        _timer = nil;
    }
}

-(void)dealloc{
    NSLog(@"%s dealloc",object_getClassName(self));
}

需要倒计时的Controller

@interface WKSeeVideoViewController ()
@property (strong, nonatomic)  CountDown *countDown;
@end
- (void)viewDidLoad {
    [super viewDidLoad];
    
    self.countDown = [[CountDown alloc] init];

}

//倒计时按钮的点击事件
-(void)okButtonClick:(UIButton*)btn{

    //获取btn的tag值，根据tag值获取当前btn的数据源。
    NSString * index = [NSString stringWithFormat:@"%ld",btn.tag - 600];

    WKVideoInfoListModel * model = self.dataArr[index.integerValue];

    //判断当前下标数组是否已包含此btn
    BOOLisInsert = [self.timerArrcontainsObject:index];

    if(isInsert ==NO) {
        [self.timerArraddObject:index];
    }
    //btn处于“去完成”状态时，才允许进行倒计时操作
    if ([btn.titleLabel.text isEqualToString:@"去完成"]) {

        //每次倒计时之前，当前时间加上120秒。
        [dataSource replaceObjectAtIndex:index.integerValue withObject:[self getCurrentTimesAndAfterTime:model.time]];

        __weak__typeof(self) weakSelf=self;

        ///每秒回调一次
        [self.countDown countDownWithPER_SECBlock:^{

            [weakSelfupdateTimeInVisibleCells];

        }];
    }
}

#pragma mark - 倒计时相关⏬⏬⏬⏬⏬⏬⏬⏬⏬⏬⏬⏬
-(void)updateTimeInVisibleCells{
    
    NSArray  *cells = self.tableView.visibleCells; //取出屏幕可见ceLl
    
    //下标数组包含的btn才可进行倒计时操作
    for (NSString * index in self.timerArr) {
        
        for (WKMakesListCell * cell in cells) {
            
            if (cell.tag == index.integerValue) {
                
                [cell.okButton setTitle:[self getNowTimeWithString:dataSource[cell.tag]] forState:0];
            }
        }
    }
}

(NSString *)getNowTimeWithString:(NSString *)aTimeString{
    NSDateFormatter* formater = [[NSDateFormatter alloc] init];
    [formater setDateFormat:@"yyyy-MM-dd HH:mm:ss"];
    // 截止时间date格式
    NSDate  *expireDate = [formater dateFromString:aTimeString];
    NSDate  *nowDate = [NSDate date];
    // 当前时间字符串格式
    NSString *nowDateStr = [formater stringFromDate:nowDate];
    // 当前时间date格式
    nowDate = [formater dateFromString:nowDateStr];
    
    NSTimeInterval timeInterval =[expireDate timeIntervalSinceDate:nowDate];
    int days = (int)(timeInterval/(3600*24));
    int hours = (int)((timeInterval-days*24*3600)/3600);
    int minutes = (int)(timeInterval-days*24*3600-hours*3600)/60;
    int seconds = timeInterval-days*24*3600-hours*3600-minutes*60;
    
    NSString *dayStr;NSString *hoursStr;NSString *minutesStr;NSString *secondsStr;
    //天
    dayStr = [NSString stringWithFormat:@"%d",days];
    //小时
    hoursStr = [NSString stringWithFormat:@"%d",hours];
    //分钟
    if(minutes<10)
        minutesStr = [NSString stringWithFormat:@"0%d",minutes];
    else
        minutesStr = [NSString stringWithFormat:@"%d",minutes];
    //秒
    if(seconds < 10)
        secondsStr = [NSString stringWithFormat:@"0%d", seconds];
    else
        secondsStr = [NSString stringWithFormat:@"%d",seconds];
    if (minutes<=0&&seconds<=0) {
        return @"去完成";
    }
    if (days) {
//在这里也可以添加天、时、分、秒
        return [NSString stringWithFormat:@"%@:%@",minutesStr,secondsStr];
    }
//在这里也可以添加时、分、秒
    return [NSString stringWithFormat:@"%@:%@", minutesStr,secondsStr];
}
//获取当前的时间 加上若干时间后的时间，单位：秒
-(NSString*)getCurrentTimesAndAfterTime:(NSInteger)afterTime{
    
    NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
    
    // ----------设置你想要的格式,hh与HH的区别:分别表示12小时制,24小时制
    
    [formatter setDateFormat:@"YYYY-MM-dd HH:mm:ss"];
    
    //现在时间,你可以输出来看下是什么格式
    
    NSDate *datenow = [NSDate date];
    
    NSCalendar *gregorian = [[NSCalendar alloc] initWithCalendarIdentifier:NSCalendarIdentifierGregorian];
    NSDateComponents *offsetComponents = [[NSDateComponents alloc] init];
    [offsetComponents setSecond:afterTime];//加上若干秒
    NSDate *resultDate = [gregorian dateByAddingComponents:offsetComponents toDate:datenow options:0];

    //----------将nsdate按formatter格式转成nsstring
    NSString *currentTimeString = [formatter stringFromDate:resultDate];
    
    NSLog(@"currentTimeString =  %@",currentTimeString);
    
    return currentTimeString;
}
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