NSDateComponents周在iOS8上的工作方式不同

Question

NSDateComponents week从iOS8开始不推荐使用.Apple建议使用weekOfMonth或weekOfYear取而代之,取决于上下文,但它们以不同的方式工作.例如:

components1 = [calendar components:NSMonthCalendarUnit | NSWeekCalendarUnit | NSDayCalendarUnit
                          fromDate:[self date7DaysAgo]
                            toDate:[NSDate date]
                           options:0];

components1返回month = 0,week = 1,day = 0,weekOfMonth并且weekOfYear都等于2147483647(整数最大值).

components2 = [calendar components:NSMonthCalendarUnit | NSWeekCalendarUnit | NSDayCalendarUnit
                          fromDate:[self date30DaysAgo]
                            toDate:[NSDate date]
                           options:0];

components2返回month = 1(我知道它取决于,但它只是一个例子),week = 0,day = 0,weekOfMonth并且weekOfYear都等于2147483647(整数最大值).

Week返回某段时间内的周数(如果是一周或多数),它与月或一周中的周数完全不同.苹果为什么建议使用它呢？

Answer 1

使用NSWeekOfMonthCalendarUnit或NSWeekOfYearCalendarUnit代替NSWeekCalendarUnit.