IOS 判断是否为昨天

代码：

- (BOOL)isYesterday

{

    NSDate *now = [NSDate date];

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

    fmt.dateFormat = @"yyyy-MM-dd";

    

    NSString *nowStr = [fmt stringFromDate:now];

    NSDate *nowDate = [fmt dateFromString:nowStr];

    

    

    NSString *selfStr = [fmt stringFromDate:self];

    NSDate *selfDate = [fmt dateFromString:selfStr];

    

    //获得nowDate和selfDate的差距

    NSCalendar *calendar = [NSCalendar currentCalendar];

    NSDateComponents *cmps = [calendar components:NSCalendarUnitDay fromDate:selfDate toDate:nowDate options:0];

    return cmps.day == 1;

    

}

其他内容详见NSDate+MJ