NSDateComponents 计算时间差的坑

如果你找了好久时间差还没计算对，那恭喜你能看到这篇文章，喜欢的亲点赞

第一步：初始化日历

NSCalendar *gregorian = [[NSCalendar alloc]initWithCalendarIdentifier:NSCalendarIdentifierGregorian];

第二步：设置区域和时区

NSLocale * locale = [NSLocale autoupdatingCurrentLocale];

    [gregorian setLocale:locale];

    NSTimeZone * timeZone = [NSTimeZone systemTimeZone];

    [gregorian setTimeZone:timeZone];

第三步：格式化时间

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

    [dateFormatter setDateFormat:@"yyyy-MM-dd"];

第四步：计算天数

    NSDate *fromDate;

    NSDate *toDate;

    [gregorian rangeOfUnit:NSCalendarUnitDay startDate:&fromDate interval:NULL forDate:[dateFormatter dateFromString:fromDay]];

    [gregorian rangeOfUnit:NSCalendarUnitDay startDate:&toDate interval:NULL forDate:[dateFormatter dateFromString:toDay]];

第五步：比较天数

NSDateComponents *dayComponents = [gregorian components:NSCalendarUnitDay fromDate:fromDate toDate:toDate options:0];

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