如何获得未来的约会

Question

如何使用NSDateComponents获取周三和周五的未来日期？答案将不胜感激。提前谢谢。

Answer 1

如果你想让它完全防弹，这实际上是一个棘手的问题。我就是这样做的：

NSInteger wednesday = 4; // Wed is the 4th day of the week (Sunday is 1)
NSInteger friday = 6;

NSDate *start = ...; // your starting date
NSDateComponents *components = [[NSDateComponents alloc] init];
NSCalendar *gregorian = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];

for (int i = 0; i < 100; ++i) {
  [components setDay:i];
  NSDate *target = [gregorian dateByAddingComponents:components toDate:start options:0];
  NSDateComponents *targetComponents = [gregorian components:NSUIntegerMax fromDate:target];
  if ([targetComponents weekday] == wednesday || [targetComponents weekday] == friday) {
    NSLog(@"found wed/fri on %d-%d-%d", [targetComponents month], [targetComponents day], [targetComponents year]);
  }
}

[gregorian release];
[components release];

Answer 2

要获得正确的星期几，您必须创建一个合适的NSCalendar实例，使用dateFromComponents创建一个NSDate对象：然后使用components：fromDate：来检索工作日。

Answer 3

如果您有具体工作日（周三）的NSDate实例，则可以使用以下代码获取新的未来日期：

NSDate *yourDate = ...
NSDateComponents* components = [[NSDateComponents alloc] init];
components.week = weeks;
NSDate* futureDate = [[NSCalendar reCurrentCalendar] dateByAddingComponents:components toDate:yourDate options:0];
[components release];

P.S。同意Brian，在询问前尝试研究。