如何使用周数获​​取一周的星期一日期

Question

How can I find out the Date of Monday if I pass the week number. For example, I need the Monday of the Week 24 of the year

Answer 1

Fill out a NSDateComponents object with the information you have. Then you can ask the current NSCalendar what date corresponds to those components.

NSDateComponents *components = [NSDateComponents new];
components.weekday = 2;
components.weekOfYear = 24;
components.year = 2012;
NSDate *date = [[NSCalendar currentCalendar] dateFromComponents: components];

The weekday property starts with Sunday = 1.

If you are on OS X 10.7 or newer you should use the property yearForWeekOfYear instead of year .