时间格式化 当天显示为 今天 和 HH:mm, 非当天显示

最近有个需求处理时间格式化如下图

当天显示为 今天 和 HH:mm, 不是同一天的显示为 MM/dd 和 HH:mm, 非当年的显示yyyy年
最后用了一个简单的思路来解决下

先写一个工具类
.h文件
@interface TimeModel : NSObject

@property (nonatomic, copy) NSString *yearString;

@property (nonatomic, copy) NSString *monthDayString;

@property (nonatomic, copy) NSString *timeString;

/*
 * 时间格式化  当天显示为  今天 和 HH:mm,  非当天显示MM/dd 和 HH:mm, 非当年的显示yyyy年
 *pragma prevDate - 上一个时间
 *pragma nextDate - 当前需要计算的时间
 *pragma formate - 时间格式化样式
 */
+ (TimeModel *)formateDate:(NSDate *)prevDate
                  nextDate:(NSDate *)nextDate
               withFormate:(NSString *)formate;

@end

.m文件
@implementation TimeModel

/*
 * 时间格式化  当天显示为  今天 和 HH:mm,  非当天显示MM/dd 和 HH:mm, 非当年的显示yyyy年
 *pragma prevDate - 上一个时间
 *pragma nextDate - 当前需要计算的时间
 *pragma formate - 时间格式化样式
 */
+ (TimeModel *)formateDate:(NSDate *)prevDate
                  nextDate:(NSDate *)nextDate
               withFormate:(NSString *)formate
{
    @try {

        if (formate.length < 0) {
            formate = @"yyyy-MM-dd HH:mm:ss";
        }
    
        //实例化一个NSDateFormatter对象
        NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
        [dateFormatter setDateFormat:formate];
        
        NSDate * nowDate = [NSDate date];

        // 再然后，把间隔的秒数折算成天数和小时数：
        NSString *yearString = @"";
        NSString *monthDayString = @"";
        NSString *timeString = @"";

        /** 同一天的数据 */
        [dateFormatter setDateFormat:@"MM/dd"];
        NSString *prevMonthDay = [dateFormatter stringFromDate:prevDate];
        NSString *needMonthDay = [dateFormatter stringFromDate:nextDate];
        NSString *nowMonthDay = [dateFormatter stringFromDate:nowDate];
        
        /** 同一年 */
        [dateFormatter setDateFormat:@"yyyy年"];
        NSString *prevYear = [dateFormatter stringFromDate:prevDate];
        NSString *needYear = [dateFormatter stringFromDate:nextDate];
        NSString *nowYear = [dateFormatter stringFromDate:nowDate];
        
        
        /** 处理显示年 */
        if (![needYear isEqualToString:prevYear]) {
            yearString = needYear;
            if (!prevYear && [needYear isEqualToString:nowYear]) {
                yearString = @"";
            }
        }
        
        /** 处理显示天 */
        if (![needMonthDay isEqualToString:prevMonthDay]) {
            monthDayString = needMonthDay;
            [dateFormatter setDateFormat:@"HH:mm"];
            timeString = [dateFormatter stringFromDate:nextDate];
            if (!prevMonthDay) {
                if ([needMonthDay isEqualToString:nowMonthDay]) {
                    monthDayString = @"今天";
                }
            }
        } else {
            [dateFormatter setDateFormat:@"HH:mm"];
            timeString = [dateFormatter stringFromDate:nextDate];
        }
        
        TimeModel *timeModel = [[TimeModel alloc] init];
        timeModel.yearString = yearString;
        timeModel.monthDayString = monthDayString;
        timeModel.timeString = timeString;
        return timeModel;
        
    } @catch (NSException *exception) {
        TimeModel *timeModel = [[TimeModel alloc] init];
        return timeModel;
    }
}
@end

实际中的业务逻辑是可以获取到一些时间数组,以时间戳为例

//获取当前时间戳 （以毫秒为单位）
+ (NSString *)getNowTimeTimestamp3{
    NSDateFormatter *formatter = [[NSDateFormatter alloc] init] ;
    [formatter setDateStyle:NSDateFormatterMediumStyle];
    [formatter setTimeStyle:NSDateFormatterShortStyle];
    [formatter setDateFormat:@"YYYY-MM-dd HH:mm:ss SSS"]; // ----------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
    //设置时区,这个对于时间的处理有时很重要
    NSTimeZone* timeZone = [NSTimeZone timeZoneWithName:@"Asia/Shanghai"];
    [formatter setTimeZone:timeZone];
    NSDate *datenow = [NSDate date];//现在时间,你可以输出来看下是什么格式
    NSString *timeSp = [NSString stringWithFormat:@"%ld", (long)[datenow timeIntervalSince1970]*1000];
    return timeSp;
}

/** 存储时间戳数组 */
- (NSMutableArray *)dataArray
{
    if (!_dataArray) {
        _dataArray = [NSMutableArray array];
        [_dataArray addObject:[[self class] getNowTimeTimestamp3]];
        [_dataArray addObject:@"1634300370000"];
        [_dataArray addObject:@"1634806363000"];
        [_dataArray addObject:@"1634806422000"];
    }
    return _dataArray;
}

/** 存储格式化后的 TimeModel 数据 */
- (NSMutableArray *)resultArray
{
    if (!_resultArray) {
        _resultArray = [NSMutableArray array];
    }
    return _resultArray;
}

/**
 将时间戳转化为date类型

 @param dateString 毫秒字符串时间
 @return NSDate日期
 */
- (NSDate *)formatDateWithDateString:(NSString *)dateString
{
    NSTimeInterval time = [dateString longLongValue]/1000;
    NSDate *confromTimesp = [NSDate dateWithTimeIntervalSince1970:time];
    return confromTimesp;
}


暂时写在touch事件里做测试
-(void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event
{
    [self.resultArray removeAllObjects];
    
    for (int i = 0; i < self.dataArray.count; i++) {
       
        NSDate *infoDate;
        NSDate *nextDate;
        
        if (i == 0) {
            infoDate = nil;
        }else{
            infoDate = [self formatDateWithDateString:self.dataArray[i-1]];
        }
        nextDate = [self formatDateWithDateString:self.dataArray[i]];

        TimeModel *timeModel = [[self class] formateDate:infoDate nextDate:nextDate withFormate:@""];
        [self.resultArray addObject:timeModel];
    }
    
    NSLog(@"self.resultArray = %@", self.resultArray);
    
}

时间处理结束