dayofyear到NSDate目標c

Question

簡單的問題。我有一些骯髒的解決方案，但無法弄清楚一個乾淨，健壯的解決方案。問題是我有dayofyear（從SQL Server），我想將其轉換爲NSDate。詳細介紹：

int dayofyear = 205 //I have this 

NSDate* date = ??something by adding dayofyear to 1/1/currentyear(2013)?? 

//must have : date = 07/25/2013 

感謝

阿爾達

Answer 1

獲得 「本年度的開始」：

NSCalendar *cal = [NSCalendar currentCalendar]; 
NSDate *now = [NSDate date]; 
NSDate *startOfYear; 
[cal rangeOfUnit:NSYearCalendarUnit startDate:&startOfYear interval:NULL 
     forDate:now]; 
// startOfYear represents now the start of the current year. 

添加205天：

int dayofyear = 205; 
NSDateComponents *comp = [[NSDateComponents alloc] init]; 
[comp setDay:dayofyear]; 
NSDate *newDate = [cal dateByAddingComponents:comp toDate:startOfYear options:0];