倒计时
工具tool
.h
//
#import <Foundation/Foundation.h>
#import "CountDown.h"
NS_ASSUME_NONNULL_BEGIN
@interface CountDownTool : NSObject
/**
* 转换
* @brief 转换
* @param aTimeString 字符串
* @return 返回自己要的字符串
*/
+ (NSString *)getNowTimeWithString:(NSString *)aTimeString;
/**
* 根据传入的年份和月份获得该月份的天数
*
* @param year
* 年份-正整数
* @param month
* 月份-正整数
* @return 返回天数
*/
+ (NSInteger)getDayNumberWithYear:(NSInteger)y month:(NSInteger)m;
@end
NS_ASSUME_NONNULL_END
m
//
#import "CountDownTool.h"
@implementation CountDownTool
//+ (void)updateTimeInVisibleTableViewCells:(UITableView *)tableView cell:(UITableViewCell *)tableViewCell
//{
// NSArray *cellArys = tableView.visibleCells; // 取出屏幕可见ceLl
// for (tableViewCell *cell in cellArys)
// {
// NSIndexPath *indexPath = [tableView indexPathForCell:cell];
// cell.countDownLabel.text = [self getNowTimeWithString:dataSource[indexPath.row]];
// if ([cell.countDownLabel.text isEqualToString:@"活动已经结束！"])
// {
// cell.countDownLabel.textColor = [UIColor redColor];
// }
// else
// {
// cell.countDownLabel.textColor = [UIColor orangeColor];
// }
// }
//}
/**
* 转换
* @brief 转换
* @param aTimeString 字符串
* @return 返回自己要的字符串
*/
+ (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 (hours <= 0 && minutes <= 0 && seconds <= 0)
{
return @"活动已经结束！";
}
if (days)
{
return [NSString stringWithFormat:@"%@天 %@小时 %@分 %@秒", dayStr, hoursStr, minutesStr, secondsStr];
}
return [NSString stringWithFormat:@"%@小时 %@分 %@秒", hoursStr, minutesStr, secondsStr];
}
/**
* 根据传入的年份和月份获得该月份的天数
*
* @param year
* 年份-正整数
* @param month
* 月份-正整数
* @return 返回天数
*/
+ (NSInteger)getDayNumberWithYear:(NSInteger)y month:(NSInteger)m
{
int days[] = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
if (2 == m && 0 == (y % 4) && (0 != (y % 100) || 0 == (y % 400))) {
days[1] = 29;
}
return (days[m - 1]);
}
@end
核心
.h
//
#import <Foundation/Foundation.h>
#import <UIKit/UIKit.h>
@interface CountDown : NSObject
/**
* 用NSDate日期倒计时
* @brief 用NSDate日期倒计时
* @param startDate NSDate ，finishDate NSDate
* @return void 返回 completeBlock ， day hour minute second
*/
- (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
* @brief 用时间戳倒计时
* @param starTimeStamp，finishTimeStamp
* @return void 返回
*/
- (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
* @brief 每秒走一次，回调block
* @param <#dic 这是个字典#>
* @return <#void 这是个空值#>
*/
- (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));
}
@end
VC 中 使用操作
创建视图 并初始化
//
self.countDown = [[CountDown alloc] init];
__weak __typeof(self) weakSelf= self;
///每秒回调一次
[self.countDown countDownWithPER_SECBlock:^{
//ALog(@"666666666666666");
[weakSelf updateTimeInVisibleCollectionViewCells];
}];
数据
// 循环创建几个先，
model.timeSsss = [NSString stringWithFormat:@"2023-04-0%d 14:2%d:0%d", i+2, i+1, i+3];
model.timeDown = [CountDownTool getNowTimeWithString:model.timeSsss];
每秒都要处理
// MARK: ----- 更新可视区域的cell倒计时
/// 更新可视区域的cell倒计时
- (void)updateTimeInVisibleCollectionViewCells
{
NSArray *cellArys = self.collectionView.visibleCells; // 取出屏幕可见ceLl
for (UICollectionViewCell *cell in cellArys)
{
if ([cell isKindOfClass:[BaseCollectionTimeCell class]])
{
NSIndexPath *indexPath = [self.collectionView indexPathForCell:cell];
BaseModel *model = self.dataAry[indexPath.section][indexPath.row];
model.timeDown = [CountDownTool getNowTimeWithString:model.timeSsss];
[self.collectionView reloadItemsAtIndexPaths:[NSArray arrayWithObjects:[NSIndexPath indexPathForRow:indexPath.row inSection:indexPath.section], nil]];
}
}
}
参考区域
二哈吃青草.gif
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