ios 获取某年某月总共多少天

// 获取某年某月总共多少天
- (int)getDaysInMonth:(int)year month:(int)imonth {
    // imonth == 0的情况是应对在CourseViewController里month-1的情况
    if((imonth == 0)||(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;
}