iOS 获取今年指定月的天数

//调用

NSInteger i = [self howManyDaysInThisMonth:2];

NSLog(@"%ld",(long)i);

 

// 获取今年指定月的天数

- (NSInteger)howManyDaysInThisMonth :(NSInteger)imonth {

    int year = [[self years][0] intValue];

    if((imonth == 1)||(imonth == 3)||(imonth == 5)||(imonth == 7)||(imonth == 8)||(imonth == 10)||(imonth == 12))

        return 31 ;

    if((imonth == 4)||(imonth == 6)||(imonth == 9)||(imonth == 11))

        return 30;

    if((year%4 == 1)||(year%4 == 2)||(year%4 == 3))

    {

        return 28;

    }

    if(year%400 == 0)

        return 29;

    if(year%100 == 0)

        return 28;

    return 29;

}

 

#pragma mark 获取当前的年月

- (NSArray *) years {

    

    NSMutableArray *yearArr = [[NSMutableArray alloc]init];

    

    NSDate *now = [NSDate date];

    NSCalendar *calendar = [NSCalendar currentCalendar];

    NSUInteger unitFlags = NSCalendarUnitYear | NSCalendarUnitMonth;

    NSDateComponents *dateComponent = [calendar components:unitFlags fromDate:now];

    

    NSInteger year = [dateComponent year];

    NSInteger month = [dateComponent month];

    [yearArr addObject:@(year)];

    [yearArr addObject:@(month)];

    return yearArr;

}