7、8上的是否是今年

/** 是否为今年 */
- (BOOL)isThisYear
{
    if ([[[UIDevice currentDevice] systemVersion] floatValue] >= 8.0) {
        NSCalendar *calendar = [NSCalendar currentCalendar];
        NSInteger nowYear = [calendar component:NSCalendarUnitYear fromDate:[NSDate date]];
        NSInteger selfYear = [calendar component:NSCalendarUnitYear fromDate:self];
        return nowYear == selfYear;
    }

    NSDate *now = [NSDate date];
    NSCalendar *calendar = [NSCalendar currentCalendar];
    NSUInteger unitFlags = NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit | NSHourCalendarUnit | NSMinuteCalendarUnit | NSSecondCalendarUnit;
    NSDateComponents *dateComponent = [calendar components:unitFlags fromDate:now];
    int year = [dateComponent year];
    if (year) {
        return YES;
    }
    return NO;

}