在本周获取周数和星期一和星期日的日期（iOS上的Objective-C）

Question

如何才能获得本周的当前周数以及周一和周日的日期？

Answer 1

我不确定这是多么有效，因为它主要是从其他答案中拼凑出来的

• NSCalendar first day of week
• How to check what day of the week it is (i.e. Tues, Fri?) and compare two NSDates?）

快速浏览一下苹果文档

• NSCalendar
• NSDateComponents
• NSDate

示例：

NSDate *today = [NSDate date];

NSCalendar *gregorian = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
gregorian.firstWeekday = 2; // Sunday = 1, Saturday = 7

NSDateComponents *components = [gregorian components:NSWeekOfYearCalendarUnit fromDate:today];

NSUInteger weekOfYear = [components weekOfYear];

NSDate *mondaysDate = nil;
[gregorian rangeOfUnit:NSWeekCalendarUnit startDate:&mondaysDate interval:NULL forDate:today];

NSLog(@"%ld %@", weekOfYear, mondaysDate);